Partenaires

Nos tutelles

Centre National de la Recherche Scientifique Université de Caen ENSICAEN Normandie Université

LPC CAEN
ENSICAEN
6, bd du Maréchal Juin
14050 CAEN Cedex
Tel : +033 (0) 231452500



Annuaire


Organigrammes


Contacts

Rechercher





Accueil > Recherche & Enseignement

M. Dominique Durand

Directeur de recherche CNRS

Groupes :
Interactions fondamentales et nature du neutrino
Théorie et phénoménologie

durand lpccaen.in2p3.fr

TEL : +33 2 31 45 29 69


PUBLICATIONS

[hal-01582779] Search for neutrinoless quadruple-$\beta$ decay of $^{150}$Nd with the NEMO-3 detector

7 septembre 2017

We report the results of a first experimental search for lepton number violation by four units in the neutrinoless quadruple-β decay of Nd150 using a total exposure of 0.19 kg yr recorded with the NEMO-3 detector at the Modane Underground Laboratory. We find no evidence of this decay and set (...)

Lire la suite

[in2p3-01480194] The BiPo-3 detector for the measurement of ultra low natural radioactivities of thin materials

13 juillet 2017

The BiPo-3 detector, running in the Canfranc Underground Laboratory (Laboratorio Subterr\'aneo de Canfranc, LSC, Spain) since 2013, is a low-radioactivity detector dedicated to measuring ultra low natural radionuclide contaminations of 208Tl (232Th chain) and 214Bi (238U chain) in thin (...)

Lire la suite

[hal-01554897] A novel segmented-scintillator antineutrino detector

5 juillet 2017

The next generation of very-short-baseline reactor experiments will require compact detectors operating at surface level and close to a nuclear reactor. This paper presents a new detector concept based on a composite solid scintillator technology. The detector target uses cubes of (...)

Lire la suite

[hal-01554847] The BiPo-3 detector

5 juillet 2017

The BiPo-3 detector is a low radioactive detector dedicated to measuring ultra-low natural contaminations of 208 Tl and 214 Bi in thin materials, initially developed to measure the radiopurity of the double β decay source foils of the SuperNEMO experiment at the μBq/kg level. The BiPo-3 technique (...)

Lire la suite

[in2p3-01349875] Model for particle production in nuclear reactions at intermediate energies: Application to C-C collisions at 95 MeV/nucleon

29 juillet 2016

A model describing nuclear collisions at intermediate energies is presented and the results are compared with recently measured double differential cross sections in C-C reactions at 95 MeV/nucleon. Results show the key role played by geometrical effects and the memory of the entrance channel, (...)

Lire la suite

[in2p3-01299739] Measurement of the Double-Beta Decay Half-Life and Search for the Neutrinoless Double-Beta Decay of $^{48}{\rm Ca}$ with the NEMO-3 Detector

20 juin 2016

The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-$\beta$ decay of $^48\rm Ca$. Using $5.25$ yr of data recorded with a $6.99\,\rm g$ sample of $^48\rm Ca$, approximately $150$ double-$\beta$ decay candidate events have been selected with a (...)

Lire la suite

[in2p3-01176181] Primary processes: from atoms to diatomic molecules and clusters

25 janvier 2016

This article presents a short review of the main progresses achieved at the GANIL facilities during the last thirty years in the field of ion-atom and ion-diatomic molecule collisions. Thanks to the wide range of projectile energies and species available on the different beam lines of the (...)

Lire la suite

[in2p3-01166055] Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment

9 novembre 2015

The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^100$Mo using the entire (...)

Lire la suite

[in2p3-01177619] The Billotron: a way to experimentally apprehend the subatomic world

18 juillet 2015

The Billotron is a device designed and built by the LPC Caen to illustrate the methods with which physicists are able to study the basic structure of matter, in particular the nucleus of the atom.

Lire la suite

[hal-00347268] Isospin diffusion in semi-peripheral $^{58}Ni$+$^{197}Au$ collisions at intermediate energies (I): Experimental results

3 juillet 2015

Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^58Ni$+$^58Ni$ and $^58Ni$+$^197Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space (...)

Lire la suite

[hal-00008456] Estimate of average freeze-out volume in multifragmentation events

3 juillet 2015

An estimate of the average freeze-out volume for multifragmentation events is presented. Values of volumes are obtained by means of a simulation using the experimental charged product partitions measured by the 4pi multidetector INDRA for 129Xe central collisions on Sn at 32 AMeV incident (...)

Lire la suite

[in2p3-00012206] Can we really measure the internal energy of hot nuclei with a 4$\pi$ detection array ?

3 juillet 2015

The second generation of high-quality detection arrays gave hope to nuclear physicists to finally obtain an experimental equation of state of nuclear matter. In spite of this progress, the measurement of the internal energy of a hot nucleus remains a very difficult task. This paper illustrates (...)

Lire la suite

[hal-00137572] New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions

3 juillet 2015

A previous analysis of the charge (Z) correlations in the $\Delta Z-$ plane for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the production of equally sized fragments (low $\Delta Z$) which was interpreted as an evidence for spinodal decomposition. However the signal is weak (...)

Lire la suite

[in2p3-00084674] Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV

3 juillet 2015

Using the quantum molecular dynamics approach, we analyze the results of the recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and 150 AMeV. It turns out that in this energy region the transition toward a participant-spectator scenario takes place. The large Au+Au system (...)

Lire la suite

[in2p3-00023603] Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation

3 juillet 2015

Isotopic effects in the fragmentation of excited target residues following collisions of $^12$C on $^112,124$Sn at incident energies of 300 and 600 MeV per nucleon were studied with the INDRA 4$\pi$ detector. The measured yield ratios for light particles and fragments with atomic number $Z (...)

Lire la suite

[in2p3-00023600] Directed and elliptic flow in $^{197}$Au+$^{197}$Au at intermediate energies

3 juillet 2015

Directed and elliptic flow for the Au + Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4 pi multi-detector. For semi-central collisions, the elliptic flow of Z = 2 particles switches from in-plane to out-of-plane enhancement at around 100 MeV (...)

Lire la suite

[in2p3-00019578] Response of CsI(Tl) scintillators over a large range in energy and atomic number of ions (Part I) : recombination and $\delta$-electrons

3 juillet 2015

A simple formalism describing the light response of CsI(Tl) to heavy ions, which quantifies the luminescence and the quenching in terms of the competition between radiative transitions following the carrier trapping at the Tl activator sites and the electron-hole recombination, is proposed. The (...)

Lire la suite

[hal-00001474] Model-independent tracking of criticality signals in nuclear multifragmentation data

3 juillet 2015

We look for signals of criticality in multifragment production in heavy-ion collisions using model-independent universal fluctuations theory. The phenomenon is studied as a function of system size, bombarding energy, and impact parameter in a wide range of INDRA data. For very central (...)

Lire la suite

[in2p3-00013647] Transverse velocity scaling in $^{197}$Au+$^{197}$Au fragmentation

3 juillet 2015

Invariant transverse-velocity spectra of intermediate-mass fragments were measured with the 4-pi multi-detector system INDRA for collisions of Au on Au at incident energies between 40 and 150 MeV per nucleon. Their scaling properties as a function of incident energy and atomic number Z are used (...)

Lire la suite

[in2p3-00023886] Neutron to proton ratios of quasiprojectile and midrapidity emission in the ${58}$Ni-${58}$Ni reaction at 52 MeV/Nucleon

3 juillet 2015

By combining data from a charged particle $^58$Ni+$^58$Ni experiment at 52 MeV/nucleon with an $^36$Ar+$^58$Ni experiment at 50 MeV/nucleon for which free neutrons have been detected, an increase in the neutron to proton ratio of the whole nuclear material at midrapidity has been experimentally (...)

Lire la suite

[hal-00110749] Spallation Neutron Production by 0.8, 1.2 and 1.6 GeV Protons on various Targets

1er juillet 2015

Spallation neutron production in proton induced reactions on Al, Fe, Zr, W, Pb and Th targets at 1.2 GeV and on Fe and Pb at 0.8, and 1.6 GeV measured at the SATURNE accelerator in Saclay is reported. The experimental double-differential cross-sections are compared with calculations performed (...)

Lire la suite

[in2p3-00024846] Performance of a micro-channel plates position sensitive detector

1er juillet 2015

The absolute detection efficiency of large area micro-channel plates (MCPs) detectors has been measured with $^6$Li$^+$ and $^23$Na$^+$ ions in the 0.5–7.5 keV energy range. Two detectors of 47mm and 83mm active diameter have been tested. They consist in a pair of MCPs mounted in a chevron (...)

Lire la suite

[hal-00510523] In-vivo impact of the MexXY efflux system on aminoglycoside efficacy in an experimental model of Pseudomonas aeruginosa pneumonia treated with tobramycin.

1er juillet 2015

Aminoglycosides are of major importance in treating Pseudomonas aeruginosa pneumonia (PAP). However, their efficacy may be compromised by low-level resistance caused by the inducible MexXY multidrug efflux pump. In the present study, the impact of the MexXY efflux pump was investigated in vivo (...)

Lire la suite

[hal-00012793] Transport and cooling of singly-charged noble gas ion beams

1er juillet 2015

The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^4He^+$ have been cooled and stored before their extraction in bunches (...)

Lire la suite

[in2p3-00868612] Electron shakeoff following the Β+ decay of trapped 35Ar+ ions

30 juin 2015

The electron shakeoff of $^35$Cl atoms resulting from the $\beta$$^+$ decay of $^35$Ar$^+$ ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The charge-state distribution of the recoiling daughter nuclei is compared to theoretical calculations accounting for (...)

Lire la suite

[in2p3-00091845] The LPCTrap facility: A novel transparent Paul trap for high-precision experiments

30 juin 2015

A trap system has been built to perform high-precision β-decay experiments. The system is coupled to the low-energy beam line of the SPIRAL source at GANIL. The continuous ion beam from SPIRAL with energies between 10 and 20 keV is slowed down by means of a buffer-gas-filled RFQ trap and ejected (...)

Lire la suite

[in2p3-00092266] Linear radio frequency quadrupole for the cooling and bunching of radioactive ion beams

30 juin 2015

A linear radio frequency quadrupole has been built for the transport, cooling, and bunching of radioactive ions extracted from an ECR source. The device uses the buffer gas cooling technique and was designed such as to extend the technique for the cooling of very light ions using H2 as buffer (...)

Lire la suite

[in2p3-00024101] Mechanism of light cluster production in nucleon induced reactions at intermediate energy

20 mai 2015

A dynamical model dedicated to the nucleon induced reaction between 30 and 150 MeV is presented. It considers different stages of the reaction: the approaching phase, the in-medium nucleon-nucleon collisions, the cluster formation, and the secondary deexcitation process. The notions of (...)

Lire la suite

[in2p3-01066044] In-medium effects for nuclear matter in the Fermi energy domain

19 septembre 2014

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain, between $15$ and $100$ A\,\textrmMeV. Using the large dataset of exclusive measurements provided by the $4\pi$ array \emphINDRA, we determine the relative degree of stopping as a function (...)

Lire la suite

[in2p3-00951921] Investigation of double beta decay of 100Mo to excited states of 100Ru

25 février 2014

Double beta decay of 100Mo to the excited states of daughter nuclei has been studied using a 600 cm3 low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic 100Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of (...)

Lire la suite

[in2p3-00912877] Search for Neutrinoless Double-Beta Decay of $^{100}$Mo with the NEMO-3 Detector

2 décembre 2013

We report the results of a search for the neutrinoless double-$\beta$ decay (0$\nu\beta\beta$) of $^100$Mo, using the NEMO-3 detector to reconstruct the full topology of the final state events. With an exposure of 34.7 kg.y, no evidence for the 0$\nu\beta\beta$ signal has been found, yielding a (...)

Lire la suite

Electron shakeoff following the Β+ decay of trapped 35Ar+ ions

1er octobre 2013

The electron shakeoff of $^35$Cl atoms resulting from the $\beta$$^+$ decay of $^35$Ar$^+$ ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The charge-state distribution of the recoiling daughter nuclei is compared to theoretical calculations accounting for (...)

Lire la suite

[in2p3-00858656] Benchmarking geant4 nuclear models for hadron therapy with 95 MeV/nucleon carbon ions

5 septembre 2013

In carbon therapy, the interaction of the incoming beam with human tissue may lead to the production of a large amount of nuclear fragments and secondary light particles. An accurate estimation of the biological dose on the tumor and the surrounding healthy tissue thus requires sophisticated (...)

Lire la suite

Nuclear stopping for heavy-ion induced reactions in the Fermi Energy range : from 1-Body to 2-Body dissipation

5 septembre 2013

We address the stopping in heavy-ion induced reactions around the Fermi energy using central collisions recorded with \emphINDRA $4\pi$ array. The stopping is minimal around the Fermi energy and corresponds to the disappearance of the Mean-Field effects and the appearance of nucleon-nucleon (...)

Lire la suite

[in2p3-00843506] Precision measurements in nuclear β-decay with LPCTrap

11 juillet 2013

The experimental achievements and the current program with the LPCTrap device installed at the LIRAT beam line of the SPIRAL1-GANIL facility are presented. The device is dedicated to the study of the weak interaction at low energy by means of precise measurements of the β−ν angular correlation (...)

Lire la suite

Measurement of the 6Li charge state distributions following the 6He+ beta decay

19 novembre 2012

We measure the probability of "shake-off" ionization of the daughter nucleus in the β decay of 6He+ ions confined in a transparent Paul trap. This measurement, in good agreement with theoretical calculations, allows to reduce systematic error contributions in previous β-v correlation experiments (...)

Lire la suite

Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV

2 juillet 2012

Using the quantum molecular dynamics approach, we analyzed the results of the recent INDRA Collaboration Au+Au experiments at GSI in the energy range between 60A and 150A MeV. It turns out that in this energy region, the transition toward a participant-spectator scenario takes place. The large (...)

Lire la suite

[in2p3-00709325] First Measurement of Pure Electron Shakeoff in the β Decay of Trapped 6He+ Ions

18 juin 2012

The electron shakeoff probability of 6Li2+ ions resulting from the β- decay of 6He+ ions has been measured with high precision using a specially designed recoil ion spectrometer. This is the first measurement of a pure electron shakeoff following nuclear β decay, not affected by multielectron (...)

Lire la suite

Characterization of quasi-projectiles produced in symmetric collisions studied with INDRA Comparison with models

1er mars 2012

The characterization of hot quasi-projectiles produced in symmetric or quasi-symmetric reactions (Au + Au, Xe + Sn, Ni + Ni, Ar + KCl) at di erent incident energies are estimated by means of two di erent procedures. The advantages and disadvantages of each method are analyzed on the basis of (...)

Lire la suite

The LPCTrap experiment: measurement of the β-ν angular correlation in 6He+ decay using a transparent Paul trap

6 juillet 2011

The LPCTrap experiment is devoted to the precise measurement of the β-ν angular correlation parameter, a βν , in the pure Gamow-Teller decay of 6He+. This experiment is motivated by the search of the presence of tensor type contributions in the weak interaction. The radioactive source is confined (...)

Lire la suite

The LPCTrap experiment: measurement of the β-ν angular correlation in 6He+ decay using a transparent Paul trap

6 juillet 2011

The LPCTrap experiment is devoted to the precise measurement of the β-ν angular correlation parameter, a βν , in the pure Gamow-Teller decay of 6He+. This experiment is motivated by the search of the presence of tensor type contributions in the weak interaction. The radioactive source is confined (...)

Lire la suite

Temperature measurement of 6He + ions confined in a transparent Paul trap

6 juillet 2011

The LPCTrap setup is a transparent Paul trap dedicated to the measurement of the β-ν correlation coefficient aβν in the β decay of trapped radioactive nuclides. In a first experiment, the system has been used to record ∼105 coincidences between the β particles and recoiling ions emitted from the decay (...)

Lire la suite

Temperature measurement of 6He + ions confined in a transparent Paul trap

6 juillet 2011

The LPCTrap setup is a transparent Paul trap dedicated to the measurement of the β-ν correlation coefficient aβν in the β decay of trapped radioactive nuclides. In a first experiment, the system has been used to record ∼105 coincidences between the β particles and recoiling ions emitted from the decay (...)

Lire la suite

Production and Separation of T = 1/2 Nuclides for $\beta$ $\nu$ angular correlation measurements

23 juin 2011

The SPIRAL facility at GANIL, which uses the so-called ISOL method to produce radioactive ion beams, is being upgraded to extend its production capabilities to the metallic beams of neutron deficient isotopes. We discuss here the potentialities offered by this upgrade for the measurement of the (...)

Lire la suite

Production and Separation of T = 1/2 Nuclides for $\beta$ $\nu$ angular correlation measurements

23 juin 2011

The SPIRAL facility at GANIL, which uses the so-called ISOL method to produce radioactive ion beams, is being upgraded to extend its production capabilities to the metallic beams of neutron deficient isotopes. We discuss here the potentialities offered by this upgrade for the measurement of the (...)

Lire la suite

Measurement of the Double Beta Decay Half-life of 130Te with the NEMO-3 Detector

10 mai 2011

This Letter reports results from the NEMO-3 experiment based on an exposure of 1275 days with 661g of 130Te in the form of enriched and natural tellurium foils. With this data set the double beta decay rate of 130Te is found to be non-zero with a significance of 7.7 standard deviations and the (...)

Lire la suite

[in2p3-00591950] Measurement of the Double Beta Decay Half-life of 130Te with the NEMO-3 Detector

10 mai 2011

This Letter reports results from the NEMO-3 experiment based on an exposure of 1275 days with 661g of 130Te in the form of enriched and natural tellurium foils. With this data set the double beta decay rate of 130Te is found to be non-zero with a significance of 7.7 standard deviations and the (...)

Lire la suite

Measurement of the beta-nu correlation coefficient a(beta nu) in the beta decay of trapped He-6(+) ions

30 mars 2011

We have measured the β-ν angular correlation in the β decay of 6He+ ions using a transparent Paul trap. The 6He+ ions, produced at GANIL, were first cooled and bunched before being injected in the LPCTrap setup. The angular correlation was inferred from the time of flight of recoil nuclei detected (...)

Lire la suite

[in2p3-00581086] Measurement of the beta-nu correlation coefficient a(beta nu) in the beta decay of trapped He-6(+) ions

30 mars 2011

We have measured the β-ν angular correlation in the β decay of 6He+ ions using a transparent Paul trap. The 6He+ ions, produced at GANIL, were first cooled and bunched before being injected in the LPCTrap setup. The angular correlation was inferred from the time of flight of recoil nuclei detected (...)

Lire la suite

Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO

3 décembre 2010

The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the (...)

Lire la suite

[in2p3-00542775] Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO

3 décembre 2010

The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the (...)

Lire la suite

Spectral modeling of scintillator for the NEMO-3 and SuperNEMO detectors

2 novembre 2010

We have constructed a GEANT4-based detailed software model of photon transport in plastic scintillator blocks and have used it to study the NEMO-3 and SuperNEMO calorimeters employed in experiments designed to search for neutrinoless double beta decay. We compare our simulations to measurements (...)

Lire la suite

[in2p3-00531392] Spectral modeling of scintillator for the NEMO-3 and SuperNEMO detectors

2 novembre 2010

We have constructed a GEANT4-based detailed software model of photon transport in plastic scintillator blocks and have used it to study the NEMO-3 and SuperNEMO calorimeters employed in experiments designed to search for neutrinoless double beta decay. We compare our simulations to measurements (...)

Lire la suite

Measurement of the double-β decay half-life of 150Nd and search for neutrinoless decay modes with the NEMO-3 detector

30 août 2010

The half-life for double-β decay of 150Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of 150Nd, we measured the half-life for 2νββ decay to be T 2ν 1/2 = (9.11+0.25 −0.22(stat.) ± 0.63(syst.)) × 1018 yr. The observed (...)

Lire la suite

[in2p3-00427207] Measurement of the double-β decay half-life of 150Nd and search for neutrinoless decay modes with the NEMO-3 detector

30 août 2010

The half-life for double-β decay of 150Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of 150Nd, we measured the half-life for 2νββ decay to be T 2ν 1/2 = (9.11+0.25 −0.22(stat.) ± 0.63(syst.)) × 1018 yr. The observed (...)

Lire la suite

Measurement of the two neutrino double beta decay half-life of Zr-96 with the NEMO-3 detector

30 août 2010

Using 9.4 g of 96Zr isotope and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kg y, the obtained 2νββ decay half-life measurement is View the MathML source. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron (...)

Lire la suite

[in2p3-00511000] Measurement of the two neutrino double beta decay half-life of Zr-96 with the NEMO-3 detector

30 août 2010

Using 9.4 g of 96Zr isotope and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kg y, the obtained 2νββ decay half-life measurement is View the MathML source. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron (...)

Lire la suite

In-vivo impact of the MexXY efflux system on aminoglycoside efficacy in an experimental model of Pseudomonas aeruginosa pneumonia treated with tobramycin.

19 août 2010

Aminoglycosides are of major importance in treating Pseudomonas aeruginosa pneumonia (PAP). However, their efficacy may be compromised by low-level resistance caused by the inducible MexXY multidrug efflux pump. In the present study, the impact of the MexXY efflux pump was investigated in vivo (...)

Lire la suite

In-vivo impact of the MexXY efflux system on aminoglycoside efficacy in an experimental model of Pseudomonas aeruginosa pneumonia treated with tobramycin.

19 août 2010

Aminoglycosides are of major importance in treating Pseudomonas aeruginosa pneumonia (PAP). However, their efficacy may be compromised by low-level resistance caused by the inducible MexXY multidrug efflux pump. In the present study, the impact of the MexXY efflux pump was investigated in vivo (...)

Lire la suite

Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils

27 juillet 2010

The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in $^208$Tl and $^214$Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 $m^2$ of sensitive surface area, has been running in the Modane Underground (...)

Lire la suite

[in2p3-00506430] Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils

27 juillet 2010

The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in $^208$Tl and $^214$Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 $m^2$ of sensitive surface area, has been running in the Modane Underground (...)

Lire la suite

Study of Nuclear Stopping in Central Collisions at Intermediate Energies

22 juin 2010

Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the mean isotropy ratio defined as the ratio of (...)

Lire la suite

[in2p3-00494230] Study of Nuclear Stopping in Central Collisions at Intermediate Energies

22 juin 2010

Nuclear stopping has been investigated in central nuclear collisions at intermediate energies by analyzing kinematically complete events recorded with the help of the 4π multidetector INDRA for a large variety of symmetric systems. It is found that the mean isotropy ratio defined as the ratio of (...)

Lire la suite

Beta Neutrino Correlation Measurement with Trapped Radioactive Ions

18 mai 2010

The beta-neutrino angular correlation coefficient provides a sensitive observable to search for physics beyond the standard electroweak model in nuclear beta decay. We address here the measurement of this parameter in the pure Gamow-Teller transition of 6He. A deviation from the standard model (...)

Lire la suite

Beta Neutrino Correlation Measurement with Trapped Radioactive Ions

18 mai 2010

The beta-neutrino angular correlation coefficient provides a sensitive observable to search for physics beyond the standard electroweak model in nuclear beta decay. We address here the measurement of this parameter in the pure Gamow-Teller transition of 6He. A deviation from the standard model (...)

Lire la suite

A study of stopping power in nuclear reactions at intermediate energies

10 mars 2010

We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon (...)

Lire la suite

A study of stopping power in nuclear reactions at intermediate energies

10 mars 2010

We show a systematic experimental study based on INDRA data of the stopping power in central symmetric nuclear reactions. Total mass of the systems goes from 80 to 400 nucleons while the incident energy range is from 12 AMeV to 100 AMeV. The role of isospin diffusion at 32 and 45 MeV/nucleon (...)

Lire la suite

Isospin diffusion in 58Ni-induced reactions at intermediate energies

4 mars 2010

Isospin diffusion is probed as a function of the dissipated energy by studying two systems $^58$Ni+$^58$Ni and $^58$Ni+$^197$Au, over the incident energy range 52-74\AM. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the (...)

Lire la suite

Isospin diffusion in 58Ni-induced reactions at intermediate energies

4 mars 2010

Isospin diffusion is probed as a function of the dissipated energy by studying two systems $^58$Ni+$^58$Ni and $^58$Ni+$^197$Au, over the incident energy range 52-74\AM. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the (...)

Lire la suite

The LPCTrap for the measurement of the β-ν correlation in 6He

25 août 2009

The application of traps to precision measurements of the β-ν angular correlation coefficient a in nuclear β-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (LPCTrap) has (...)

Lire la suite

The LPCTrap for the measurement of the β-ν correlation in 6He

25 août 2009

The application of traps to precision measurements of the β-ν angular correlation coefficient a in nuclear β-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (LPCTrap) has (...)

Lire la suite

Measurement of the two neutrino double beta decay half-life of Zr-96 and search for associated neutrinoless processes with the NEMO-3 detector

30 juin 2009

Using 1221 days of data from the NEMO-3 detector, the measurement of Zr-96 2vbb decay half-life is [2.35 +/- 0.14(stat) +/- 0.19(syst)] x 10^19 yr. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron energy, and angular (...)

Lire la suite

Correlation measurement in the $\beta$ decay of trapped $^{6}$He ions

18 juin 2009

The LPCTrap facility coupled to the low-energy beam line LIRAT of the SPIRAL installation at GANIL is a transparent Paul trap designed to perform in-trap decay experiments [1]. The first detection setup installed at this facility has been designed in order to precisely determine the b-n angular (...)

Lire la suite

Correlation measurement in the $\beta$ decay of trapped $^{6}$He ions

18 juin 2009

The LPCTrap facility coupled to the low-energy beam line LIRAT of the SPIRAL installation at GANIL is a transparent Paul trap designed to perform in-trap decay experiments [1]. The first detection setup installed at this facility has been designed in order to precisely determine the b-n angular (...)

Lire la suite

Multifragmentation and spinodal decomposition of finite nuclear systems

28 avril 2009

A bulk effect in multifragmentation of very heavy fused systems has been experimentally evidenced. Such an effect is very well reproduced by a complete dynamical simulation of collisions in which multifragmentation occurs through the growth of density fluctuations in the unstable spinodal (...)

Lire la suite

Multifragmentation and spinodal decomposition of finite nuclear systems

28 avril 2009

A bulk effect in multifragmentation of very heavy fused systems has been experimentally evidenced. Such an effect is very well reproduced by a complete dynamical simulation of collisions in which multifragmentation occurs through the growth of density fluctuations in the unstable spinodal (...)

Lire la suite

Measurement of the background in the NEMO 3 double beta decay experiment

24 avril 2009

In the double beta decay experiment NEMO~3 a precise knowledge of the background in the signal region is of outstanding importance. This article presents the methods used in NEMO~3 to evaluate the backgrounds resulting from most if not all possible origins. It also illustrates the power of the (...)

Lire la suite

[in2p3-00378540] Measurement of the background in the NEMO 3 double beta decay experiment

24 avril 2009

In the double beta decay experiment NEMO~3 a precise knowledge of the background in the signal region is of outstanding importance. This article presents the methods used in NEMO~3 to evaluate the backgrounds resulting from most if not all possible origins. It also illustrates the power of the (...)

Lire la suite

Geant4 Monte Carlo simulations for the LPCTrap setup

9 avril 2009

The LPCTrap setup at GANIL is fully operational since 2006. The first breakthrough was the detection of 100000 coincidences between the β particles and the recoil ions from the decay of 6He+ produced by the SPIRAL source. After preparation, the decaying nuclei are confined in a transparent Paul (...)

Lire la suite

Geant4 Monte Carlo simulations for the LPCTrap setup

9 avril 2009

The LPCTrap setup at GANIL is fully operational since 2006. The first breakthrough was the detection of 100000 coincidences between the β particles and the recoil ions from the decay of 6He+ produced by the SPIRAL source. After preparation, the decaying nuclei are confined in a transparent Paul (...)

Lire la suite

Search for tensor couplings in the weak interaction

27 janvier 2009

The existence of exotic couplings in the weak interaction can be tested by a precise measurement of the β-ν angular correlation parameter a in nuclear beta decay. In the case of 6He, the ratio of tensor and axial-vector couplings can be determined. The goal of the LPC Trap experiment is to (...)

Lire la suite

Search for tensor couplings in the weak interaction

27 janvier 2009

The existence of exotic couplings in the weak interaction can be tested by a precise measurement of the β-ν angular correlation parameter a in nuclear beta decay. In the case of 6He, the ratio of tensor and axial-vector couplings can be determined. The goal of the LPC Trap experiment is to (...)

Lire la suite

Isospin diffusion in semi-peripheral $^{58}Ni$+$^{197}Au$ collisions at intermediate energies (I): Experimental results

15 décembre 2008

Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^58Ni$+$^58Ni$ and $^58Ni$+$^197Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space (...)

Lire la suite

Isospin diffusion in semi-peripheral $^{58}Ni$+$^{197}Au$ collisions at intermediate energies (I): Experimental results

15 décembre 2008

Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^58Ni$+$^58Ni$ and $^58Ni$+$^197Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space (...)

Lire la suite

Status of the LPCTrap facility at GANIL

10 novembre 2008

The LPCTrap is a device whose central element is a transparent Paul trap for the efficient trapping of low energy radioactive ions produced by the SPIRAL facility at GANIL. The installation comprises a linear RFQ cooler and buncher for the beam preparation, and a decay chamber where the Paul (...)

Lire la suite

Status of the LPCTrap facility at GANIL

10 novembre 2008

The LPCTrap is a device whose central element is a transparent Paul trap for the efficient trapping of low energy radioactive ions produced by the SPIRAL facility at GANIL. The installation comprises a linear RFQ cooler and buncher for the beam preparation, and a decay chamber where the Paul (...)

Lire la suite

Paul trapping of radioactive $^{6}$He+ ions and direct observation of their beta-decay

17 octobre 2008

We demonstrate that abundant quantities of short-lived beta unstable ions can be trapped in a novel transparent Paul trap and that their decay products can directly be detected in coincidence. Low energy 6He+ (807 ms half-life) ions were extracted from the SPIRAL source at GANIL, then (...)

Lire la suite

[in2p3-00331783] Paul trapping of radioactive $^{6}$He+ ions and direct observation of their beta-decay

17 octobre 2008

We demonstrate that abundant quantities of short-lived beta unstable ions can be trapped in a novel transparent Paul trap and that their decay products can directly be detected in coincidence. Low energy 6He+ (807 ms half-life) ions were extracted from the SPIRAL source at GANIL, then (...)

Lire la suite

The LPCTrap experiment: measurement of the $\beta$–ν angular correlation in $^{6}$He using a transparent Paul trap

30 novembre 2007

We report on the status of the LPCTrap experiment, devoted to measure the β–ν angular correlation in the pure Gamow–Teller decay of $^6$He. This measurement is motivated by the search for the presence of tensor type contributions to the weak interaction. The $^6$He ions are confined in a novel (...)

Lire la suite

The LPCTrap experiment: measurement of the $\beta$–ν angular correlation in $^{6}$He using a transparent Paul trap

30 novembre 2007

We report on the status of the LPCTrap experiment, devoted to measure the β–ν angular correlation in the pure Gamow–Teller decay of $^6$He. This measurement is motivated by the search for the presence of tensor type contributions to the weak interaction. The $^6$He ions are confined in a novel (...)

Lire la suite

Source shape determination with directional fragment-fragment velocity correlations

12 novembre 2007

Correlation functions, constructed from directional projections of the relative velocities of fragments, are used to determine the shape of the breakup volume in coordinate space. For central collisions of 129Xe + natSn at 50 MeV per nucleon incident energy, measured with the 4pi multi-detector (...)

Lire la suite

[in2p3-00186887] Source shape determination with directional fragment-fragment velocity correlations

12 novembre 2007

Correlation functions, constructed from directional projections of the relative velocities of fragments, are used to determine the shape of the breakup volume in coordinate space. For central collisions of 129Xe + natSn at 50 MeV per nucleon incident energy, measured with the 4pi multi-detector (...)

Lire la suite

Production of complex particles in low energy spollation and in fragmentation reactions by in-medium random clusterization

2 juillet 2007

Rules for in-medium complex particle production in nuclear reactions are proposed. These rules have been implemented in two models to simulate nucleon-nucleus and nucleus-nucleus reactions around the Fermi energy. Our work emphasizes the effect of randomness in cluster formation, the importance (...)

Lire la suite

Production of complex particles in low energy spollation and in fragmentation reactions by in-medium random clusterization

2 juillet 2007

Rules for in-medium complex particle production in nuclear reactions are proposed. These rules have been implemented in two models to simulate nucleon-nucleus and nucleus-nucleus reactions around the Fermi energy. Our work emphasizes the effect of randomness in cluster formation, the importance (...)

Lire la suite

The LPCTrap facility for in-trap decay experiments

26 juin 2007

The LPCTrap is a device devoted to the determination of the angular correlation coefficient in the nuclear beta decay of $^6$He^+$ ions by detection of the electron and the recoil ion in coincidence in a Paul trap.The LPCTrap facility comprises an RFQ trap for beam preparation and a transparent (...)

Lire la suite

The LPCTrap facility for in-trap decay experiments

26 juin 2007

The LPCTrap is a device devoted to the determination of the angular correlation coefficient in the nuclear beta decay of $^6$He^+$ ions by detection of the electron and the recoil ion in coincidence in a Paul trap.The LPCTrap facility comprises an RFQ trap for beam preparation and a transparent (...)

Lire la suite

Correlations of neutral and charged particles in $^{40}$Ar- $^{58}$Ni reaction at 77 MeV/u

24 mai 2007

The measurement of the two-particle correlation function for different particle species allows to obtain information about the development of the particle emission process: the space-time properties of emitting sources and the emission time sequence of different particles. The single-particle (...)

Lire la suite

[in2p3-00149009] Correlations of neutral and charged particles in $^{40}$Ar- $^{58}$Ni reaction at 77 MeV/u

24 mai 2007

The measurement of the two-particle correlation function for different particle species allows to obtain information about the development of the particle emission process: the space-time properties of emitting sources and the emission time sequence of different particles. The single-particle (...)

Lire la suite

New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions

20 mars 2007

A previous analysis of the charge (Z) correlations in the $\Delta Z-$ plane for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the production of equally sized fragments (low $\Delta Z$) which was interpreted as an evidence for spinodal decomposition. However the signal is weak (...)

Lire la suite

New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions

20 mars 2007

A previous analysis of the charge (Z) correlations in the $\Delta Z-$ plane for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the production of equally sized fragments (low $\Delta Z$) which was interpreted as an evidence for spinodal decomposition. However the signal is weak (...)

Lire la suite

Universal fluctuations: a new approach to the study of phase transitions in intermediate energy heavy ion collisions

15 janvier 2007

The universal theory of order parameter fluctuations (D-scaling laws) is applied to a wide range of intermediate energy heavy-ion collision data obtained with INDRA. This systematic study confirms that the observed fragment production is compatible with aggregation scenarios for in- or (...)

Lire la suite

Universal fluctuations: a new approach to the study of phase transitions in intermediate energy heavy ion collisions

15 janvier 2007

The universal theory of order parameter fluctuations (D-scaling laws) is applied to a wide range of intermediate energy heavy-ion collision data obtained with INDRA. This systematic study confirms that the observed fragment production is compatible with aggregation scenarios for in- or (...)

Lire la suite

Directed and elliptic flow in $^{197}$Au+$^{197}$Au at intermediate energies

5 janvier 2007

Directed and elliptic flow for the $^197$Au+$^197$Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4$\pi$ multi-detector. For semi-central collisions, the excitation function of elliptic flow shows a transition from in-plane to out-of-plane (...)

Lire la suite

[in2p3-00122885] Directed and elliptic flow in $^{197}$Au+$^{197}$Au at intermediate energies

5 janvier 2007

Directed and elliptic flow for the $^197$Au+$^197$Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4$\pi$ multi-detector. For semi-central collisions, the excitation function of elliptic flow shows a transition from in-plane to out-of-plane (...)

Lire la suite

Evaluation of excitation energy and spin from light charged particles multiplicities in heavy-ion collisions

5 janvier 2007

A simple procedure for evaluating the excitation energy and the spin transfer in heavy-ion dissipative collisions is proposed. It is based on a prediction of the GEMINI evaporation code : for a nucleus with a given excitation energy, the average number of emitted protons decreases with (...)

Lire la suite

Evaluation of excitation energy and spin from light charged particles multiplicities in heavy-ion collisions

5 janvier 2007

A simple procedure for evaluating the excitation energy and the spin transfer in heavy-ion dissipative collisions is proposed. It is based on a prediction of the GEMINI evaporation code : for a nucleus with a given excitation energy, the average number of emitted protons decreases with (...)

Lire la suite

Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar + Ni system at 95 A.MeV

4 janvier 2007

The quasi-projectile (QP) properties are investigated in the Ar+Ni collisions at 95 A.MeV taking into account the intermediate velocity emission. Indeed, in this reaction, between 52 and 95 A.MeV bombarding energies, the number of particles emitted in the intermediate velocity region is related (...)

Lire la suite

Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar + Ni system at 95 A.MeV

4 janvier 2007

The quasi-projectile (QP) properties are investigated in the Ar+Ni collisions at 95 A.MeV taking into account the intermediate velocity emission. Indeed, in this reaction, between 52 and 95 A.MeV bombarding energies, the number of particles emitted in the intermediate velocity region is related (...)

Lire la suite

Comparisons of statistical multifragmentation and evaporation models for heavy-ion collisions

6 décembre 2006

The results from ten statistical multifragmentation models have been compared with each other using selected experimental observables. Even though details in any single observable may differ, the general trends among models are similar. Thus, these models and similar ones are very good in (...)

Lire la suite

[in2p3-00118535] Comparisons of statistical multifragmentation and evaporation models for heavy-ion collisions

6 décembre 2006

The results from ten statistical multifragmentation models have been compared with each other using selected experimental observables. Even though details in any single observable may differ, the general trends among models are similar. Thus, these models and similar ones are very good in (...)

Lire la suite

Spallation Neutron Production by 0.8, 1.2 and 1.6 GeV Protons on various Targets

31 octobre 2006

Spallation neutron production in proton induced reactions on Al, Fe, Zr, W, Pb and Th targets at 1.2 GeV and on Fe and Pb at 0.8, and 1.6 GeV measured at the SATURNE accelerator in Saclay is reported. The experimental double-differential cross-sections are compared with calculations performed (...)

Lire la suite

Transition from participant to spectator fragmentation in Au+Au reaction between 60 AMeV and 150 AMeV

10 juillet 2006

Using the quantum molecular dynamics approach, we analyze the results of the recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and 150 AMeV. It turns out that in this energy region the transition toward a participant-spectator scenario takes place. The large Au+Au system (...)

Lire la suite

Multifragmentation of a very heavy nuclear system (I): selection of a single-source events

10 juillet 2006

A sample of `single-source' events, compatible with the multifragmentation of very heavy fused systems, are isolated among well-measured $^155$Gd+$^nat$U 36AMeV reactions by examining the evolution of the kinematics of fragments with Z>=5 as a function of the dissipated energy and loss of (...)

Lire la suite

Multifragmentation of a very heavy nuclear system (II) bulk properties and spinodal decomposition

10 juillet 2006

The properties of fragments and light charged particles emitted in multifragmentation of single sources formed in central 36AMeV Gd+U collisions are reviewed. Most of the products are isotropically distributed in the reaction c.m. Fragment kinetic energies reveal the onset of radial collective (...)

Lire la suite

Universal fluctuations in heavy-ion collisions in the Fermi energy domain

7 juillet 2006

We discuss the scaling laws of both the charged fragments multiplicity fluctuations and the charge of the largest fragment fluctuations for Xe+Sn collisions in the range of bombarding energies between 25 MeV/A and 50 MeV/A. We show close to E_lab=32 MeV/A the transition in the fluctuation (...)

Lire la suite

Response of CsI(Tl) scintillators over a large range in energy and atomic number of ions (Part I) : recombination and $\delta$-electrons

7 juillet 2006

A simple formalism describing the light response of CsI(Tl) to heavy ions, which quantifies the luminescence and the quenching in terms of the competition between radiative transitions following the carrier trapping at the Tl activator sites and the electron-hole recombination, is proposed. The (...)

Lire la suite

Transport and cooling of singly-charged noble gas ion beams

27 octobre 2005

The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^4He^+$ have been cooled and stored before their extraction in bunches (...)

Lire la suite

Estimate of average freeze-out volume in multifragmentation events

5 septembre 2005

An estimate of the average freeze-out volume for multifragmentation events is presented. Values of volumes are obtained by means of a simulation using the experimental charged product partitions measured by the 4pi multidetector INDRA for 129Xe central collisions on Sn at 32 AMeV incident (...)

Lire la suite

Evolution of Fragment Distributions and Reaction Mechanisms for the Ar+Ni System from 32 to 95 A.MeV

24 juin 2005

Within the framework of flow and multifragmentation study, the 36Ar+58Ni experiment has been performed at seven incident energies from 32 to 95 A.MeV with the INDRA detector at GANIL. After a brief description of the experimental set-up, the main trends as well as the evolution of fragment (...)

Lire la suite

First applications of the HIPSE event generator

24 mars 2005

The predictions of an event generator, HIPSE (Heavy-Ion Phase-Space Exploration), dedi- cated to the description of nuclear collisions in the intermediate energy range, are compared with experimental data collected by the INDRA and INDRA-ALADIN collaborations. Spe- cial emphasis is put on the (...)

Lire la suite

Macroscopic / microscopic simulation of nuclear reactions at intermediate energies

24 mars 2005

An event generator, HIPSE (Heavy-Ion Phase-Space Exploration), dedicated to the descrip- tion of nuclear collisions in the intermediate energy range is presented. The model simulates events for reactions close to the fusion barrier (5-10 MeV/A) up to higher energy (100 MeV/A) and it gives (...)

Lire la suite

A study of nuclear stopping in central symmetric nuclear collisions at intermediate energies

14 mars 2005

Nuclear stopping has been investigated in central symmetric nuclear collisions at intermediate energies. Firstly, it is found that the isotropy ratio, Riso, reaches a minimum near the Fermi energy and saturates or slowly increases depending on the mass of the system as the beam energy (...)

Lire la suite

Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation

17 février 2005

Isotopic effects in the fragmentation of excited target residues following collisions of $^12$C on $^112,124$Sn at incident energies of 300 and 600 MeV per nucleon were studied with the INDRA 4$\pi$ detector. The measured yield ratios for light particles and fragments with atomic number $Z (...)

Lire la suite

Directed and elliptic flow in $^{197}$Au+$^{197}$Au at intermediate energies

11 février 2005

Directed and elliptic flow for the Au + Au system at incident energies between 40 and 150 MeV per nucleon has been measured using the INDRA 4 pi multi-detector. For semi-central collisions, the elliptic flow of Z <= 2 particles switches from in-plane to out-of-plane enhancement at around (...)

Lire la suite

Model-independent tracking of criticality signals in nuclear multifragmentation data

6 septembre 2004

We look for signals of criticality in multifragment production in heavy-ion collisions using model-independent universal fluctuations theory. The phenomenon is studied as a function of system size, bombarding energy, and impact parameter in a wide range of INDRA data. For very central (...)

Lire la suite

Transverse velocity scaling in $^{197}$Au+$^{197}$Au fragmentation

25 février 2003

Invariant transverse-velocity spectra of intermediate-mass fragments were measured with the 4-pi multi-detector system INDRA for collisions of Au on Au at incident energies between 40 and 150 MeV per nucleon. Their scaling properties as a function of incident energy and atomic number Z are used (...)

Lire la suite