# Laboratoire de Physique Corpusculaire de Caen

## Partenaires

### Nos tutelles

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

Annuaire

Organigrammes

Contacts

## M. Olivier Lopez

Chercheur CNRS

Groupe : Dynamique et thermodynamique nucléaire

lopezo in2p3.fr

Tel : +33 2 31 45 29 62

PUBLICATIONS

### [hal-01582794] Isotopic identification using Pulse Shape Analysis of current signals from silicon detectors: Recent results from the FAZIA collaboration

7 septembre 2017

The FAZIA apparatus exploits Pulse Shape Analysis (PSA) to identify nuclear fragments stopped in the first layer of a Silicon-Silicon-CsI(Tl) detector telescope. In this work, for the first time, we show that the isotopes of fragments having atomic number as high as Z∼20 can be identified. Such (...)

Lire la suite

5 juillet 2017

no abstract

Lire la suite

### [in2p3-00867220] Coulomb chronometry to probe the decay mechanism of hot nuclei

13 mars 2017

In 129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong (...)

Lire la suite

### [in2p3-01348951] New semi-automatic method for reaction product charge and mass identification in heavy-ion collisions at Fermi energies

3 février 2017

This article presents a new semi-automatic method for charge and mass identification of charged nuclear fragments using either ∆E − E correlations between measured energy losses in two successive detectors or correlations between charge signal amplitude and rise time in a single silicon detector, (...)

Lire la suite

### [hal-01438702] ParSys: a new particle system for the introduction of on-line physical behaviour to three-dimensional synthetic objects

18 janvier 2017

The incorporation of physical behaviour to synthetic objects constructed by computer is one of the main objectives of computer graphics research. In this paper we present a new interactive deformable model based on linked volumes. As such, it is straightforward and implicitly preserves the (...)

Lire la suite

### [in2p3-01345974] Reaction and fusion cross sections for the near-symmetric system $^{129}$Xe+$^{nat}$Sn from $8$ to $35$ $AMeV$

20 octobre 2016

item[Background]Heavy-ion reactions from barrier up to Fermi energy. \item[Purpose]Reaction and fusion cross sections determination. Fusion reactions induced by $^129Xe$ projectiles on $^natSn$ targets for energies ranging from $8$ A.MeV to $35$ A.MeV were measured with the INDRA (...)

Lire la suite

### [in2p3-01100158] Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

6 juin 2016

We report experimental signals of Bose-Einstein condensation in the decay of hot Ca projectilelike sources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup, constituted by the coupling of the INDRA 4$\pi$ detector array to the forward angle VAMOS magnetic (...)

Lire la suite

### [in2p3-01300455] Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

11 avril 2016

We report on first experimental observations of nuclear fermionic and bosonic components displaying different behaviours in the decay of hot Ca projectile-like sources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup, constituted by the coupling of the INDRA (...)

Lire la suite

### [in2p3-01282609] Probing clustering in excited alpha-conjugate nuclei

30 mars 2016

The fragmentation of quasi-projectiles from the nuclear reaction $^40$Ca+$^12$C at 25 MeV per nucleon bombarding energy was used to produce $\alpha$-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and (...)

Lire la suite

6 octobre 2015

[...]

Lire la suite

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

11 septembre 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

### [in2p3-01177619] 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

### [in2p3-01120218] Low-temperature technique of thin silicon ion implanted epitaxial detectors

4 juillet 2015

A new technique of large-area thin ion implanted silicon detectors has been developed within the R&D performed by the FAZIA Collaboration. The essence of the technique is the application of a lowtemperature baking process instead of high-temperature annealing. This thermal treatment is (...)

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-00112886] Bimodalities : a survey of experimental data and models

3 juillet 2015

Bimodal distributions of some chosen variables measured in nuclear collisions were recently proposed as a non ambiguous signature of a first order phase transition in nuclei. This section presents a compilation of both theoretical and experimental studies on bimodalities performed so far, in (...)

Lire la suite

### [hal-00008225] Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out.

3 juillet 2015

Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic mean-field calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 AMeV 129Xe+natSn and 36 AMeV (...)

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

### [hal-00004650] Bimodality as a signal of Liquid-Gas phase transition in nuclei?

3 juillet 2015

We use the HIPSE (Heavy-Ion Phase-Space Exploration) Model to discuss the origin of the bimodality in charge asymmetry observed in nuclear reactions around the Fermi energy. We show that it may be related to the important angular momentum (spin) transferred into the quasi-projectile before (...)

Lire la suite

3 juillet 2015

[...]

Lire la suite

3 juillet 2015

[...]

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

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

3 juillet 2015

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

3 juillet 2015

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

8 février 2005

Lire la suite

3 novembre 2004

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

16 avril 2004

Lire la suite

15 mars 2004

Lire la suite

22 juillet 2003

Lire la suite

11 juin 2003

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

### Multifragmentation process for different mass asymmetry in the entrance channel around the fermi energy

30 septembre 2002

Lire la suite