# Laboratoire de Physique Corpusculaire de Caen

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

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## M. Gilles Quéméner

Chercheur CNRS

Groupe : Interactions fondamentales et nature du neutrino

Tél : +33 2 31 45 25 40

PUBLICATIONS

### [hal-01645779] Active compensation of magnetic field distortions based on vector spherical harmonics field description

24 novembre 2017

An analytic solution to the magnetostatic inverse problem in the framework of vector spherical harmonic basis functions is presented. This formalism is used for the design of a spherical magnetic field compensation system and its performance is compared with an already existing rectangular coil (...)

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### [hal-01642862] Highly stable atomic vector magnetometer based on free spin precession

22 novembre 2017

We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 $\mu$T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and (...)

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### [hal-01642404] Active compensation of magnetic field distortions based on vector spherical harmonics field description

22 novembre 2017

An analytic solution to the magnetostatic inverse problem in the framework of vector spherical harmonic basis functions is presented. This formalism is used for the design of a spherical magnetic field compensation system and its performance is compared with an already existing rectangular coil (...)

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### [hal-01641066] Highly stable atomic vector magnetometer based on free spin precession

21 novembre 2017

We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 $\mu$T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and (...)

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### [in2p3-01199753] A revised experimental upper limit on the electric dipole moment of the neutron

18 février 2017

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in (...)

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### [in2p3-01337513] Ultracold neutron detection with 6Li-doped glass scintillators, NANOSC: a fast ultracold neutron detector for the nEDM experiment at the Paul Scherrer Institute

2 novembre 2016

This paper summarizes the results from measurements aiming to characterize ultracold neutron detection with 6Li-doped glass scintillators. Single GS10 or GS20 scintillators, with a thickness of 100-200 micrometer, fulfill the ultracold neutron detection requirements with an acceptable (...)

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### [in2p3-01213941] A highly stable atomic vector magnetometer based on free spin precession

15 décembre 2015

We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 $\mu$T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and (...)

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### [in2p3-01140188] Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field

18 novembre 2015

We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for $^199\rm Hg$ atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the (...)

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### [in2p3-01120938] A device for simultaneous spin analysis of ultracold neutrons

18 novembre 2015

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer (...)

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### [in2p3-01159876] Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

19 octobre 2015

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a $|B_0|=1~\text\mu T$ magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an (...)

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### [in2p3-01169555] Gravitational depolarization of ultracold neutrons: Comparison with data

9 octobre 2015

We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field (...)

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1er juillet 2015

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23 juin 2005

We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 $\leq$ Q$^2$ \leq$1.0 GeV$^2$. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange quark (...) Lire la suite ### Experimental review of the nucleon electroweak form factors 30 mai 2005 Since more than 50 years, lots of results have been obtained on the nucleon electromagnetic form factors and their Q$^2$-dependence (up to 31 (GeV/c)$^2$for$G_M$) through elastic electron scattering off the nucleon. This is far from being the case for the electroweak form factors which are (...) Lire la suite ### Experimental review of the nucleon electroweak form factors 30 mai 2005 Since more than 50 years, lots of results have been obtained on the nucleon electromagnetic form factors and their Q$^2$-dependence (up to 31 (GeV/c)$^2$for$G_M$) through elastic electron scattering off the nucleon. This is far from being the case for the electroweak form factors which are (...) Lire la suite ### Quasielastic$^{3}He(e,e'p)^{2}H$reaction at Q2=1.5 GeV2 for recoil momenta up to 1 GeV/c 26 mai 2005 We have studied the quasielastic$^3He(e,e'p)^2H$reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The$^3He(e,e'p)^2H$cross section was measured for missing momenta up to 1000 MeV/c, (...) Lire la suite ### Quasielastic$^{3}He(e,e'p)^{2}H$reaction at Q2=1.5 GeV2 for recoil momenta up to 1 GeV/c 26 mai 2005 We have studied the quasielastic$^3He(e,e'p)^2H$reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The$^3He(e,e'p)^2H$cross section was measured for missing momenta up to 1000 MeV/c, (...) Lire la suite ### Proton elastic form factor ratios to$Q^2$=3.5 GeV$^2$by polarization transfer 25 mai 2005 The ratio of the proton elastic electromagnetic form factors,$G_Ep/G_Mp$, was obtained by measuring$P_t$and$P_\ell$, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic$\vec e p \to e\vec p$~reaction in the four-momentum transfer squared (...) Lire la suite ### Proton elastic form factor ratios to$Q^2$=3.5 GeV$^2$by polarization transfer 25 mai 2005 The ratio of the proton elastic electromagnetic form factors,$G_Ep/G_Mp$, was obtained by measuring$P_t$and$P_\ell$, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic$\vec e p \to e\vec p$~reaction in the four-momentum transfer squared (...) Lire la suite ### Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta 14 mars 2005 Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q = 1502 MeV/c and omega = 840 MeV, respectively, for missing momenta p_m up to 1 GeV/c and missing energies in the continuum (...) Lire la suite ### Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta 14 mars 2005 Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q = 1502 MeV/c and omega = 840 MeV, respectively, for missing momenta p_m up to 1 GeV/c and missing energies in the continuum (...) Lire la suite ### CARTOGRAPHIE MAGNETIQUE DES QUADRIPOLES DES SPECTROMETRES A HAUTE RESOLUTION DU THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY, HALL A. (Le Projet Q.M.M : Quadrupole Magnetic Measurement) 17 décembre 2004 Cette thèse décrit les mesures magnétiques réalisées sur les quadripoles supraconducteurs équipant les spectromètres à haute résolution (HRS) de TJNAF, Hall A (USA), caractérisés par une résolution sigma p/p= 10 -4 pour p <4 GeV.c-1. Une méthode originale basée sur une sonde tournante multibobines a (...) Lire la suite ### CARTOGRAPHIE MAGNETIQUE DES QUADRIPOLES DES SPECTROMETRES A HAUTE RESOLUTION DU THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY, HALL A. (Le Projet Q.M.M : Quadrupole Magnetic Measurement) 17 décembre 2004 Cette thèse décrit les mesures magnétiques réalisées sur les quadripoles supraconducteurs équipant les spectromètres à haute résolution (HRS) de TJNAF, Hall A (USA), caractérisés par une résolution sigma p/p= 10 -4 pour p <4 GeV.c-1. Une méthode originale basée sur une sonde tournante multibobines a (...) Lire la suite ### The dynamics of the quasielastic$^{16}O$(e,e'p) reaction at$Q^2\approx$0.8 (GeV/c)$^2$1er décembre 2004 The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the 16O(e,e'p) reaction in quasielastic, constant (q,w) kinematics at Q^2 ~ 0.8 (GeV/c)^2, q ~ 1 GeV/c, and w ~ 445 MeV. Use of a self-calibrating, self-normalizing, thin-film (...) Lire la suite ### The dynamics of the quasielastic$^{16}O$(e,e'p) reaction at$Q^2\approx$0.8 (GeV/c)$^2$1er décembre 2004 The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the 16O(e,e'p) reaction in quasielastic, constant (q,w) kinematics at Q^2 ~ 0.8 (GeV/c)^2, q ~ 1 GeV/c, and w ~ 445 MeV. Use of a self-calibrating, self-normalizing, thin-film (...) Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2$= 0.92 and 1.76 Gev$^2$1er décembre 2004 We report a Virtual Compton Scattering study of the proton in Hall A at the Thomas Jefferson National Accelerator Facility at low CM energies. We have determined the structure functions$P_LL-P_TT/\epsilon$and$P_LT$, and the electric and magnetic Generalized Polarizabilities (GP) (...) Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2$= 0.92 and 1.76 Gev$^2$1er décembre 2004 We report a Virtual Compton Scattering study of the proton in Hall A at the Thomas Jefferson National Accelerator Facility at low CM energies. We have determined the structure functions$P_LL-P_TT/\epsilon$and$P_LT$, and the electric and magnetic Generalized Polarizabilities (GP) (...) Lire la suite ### Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of$Q^2$= 1.0$GeV^2$5 mai 2004 We have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* (...) Lire la suite ### Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of$Q^2$= 1.0$GeV^2$5 mai 2004 We have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* (...) Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2=0.92 and 1.76 GeV^2$: I. Low energy expansion analysis 5 mai 2004 Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2=0.92 and 1.76 GeV^2$: I. Low energy expansion analysis 5 mai 2004 Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2=0.92 and 1.76 GeV^2$: II. Dispersion relation analysis 5 mai 2004 Lire la suite ### Measurement of the generalized polarizabilities of the proton in virtual compton scattering at$Q^2=0.92 and 1.76 GeV^2$: II. Dispersion relation analysis 5 mai 2004 Lire la suite ### Backward electroproduction of$\pi^0$mesons on protons in the region of nucleon resonances at four momentum transfer squared$Q^2 = 1.0 GeV^2$5 mai 2004 Exclusive electroproduction of pi0 mesons on protons in the backward hemisphere has been studied at Q2=1.0 GeV2 by detecting protons in the forward direction in coincidence with scattered electrons from the 4 GeV electron beam in Jefferson Lab's Hall A. The data span the range of the total (...) Lire la suite ### Backward electroproduction of$\pi^0$mesons on protons in the region of nucleon resonances at four momentum transfer squared$Q^2 = 1.0 GeV^2$5 mai 2004 Exclusive electroproduction of pi0 mesons on protons in the backward hemisphere has been studied at Q2=1.0 GeV2 by detecting protons in the forward direction in coincidence with scattered electrons from the 4 GeV electron beam in Jefferson Lab's Hall A. The data span the range of the total (...) Lire la suite ### Basic instrumentation for Hall A at Jefferson Lab 3 mai 2004 Lire la suite ### Basic instrumentation for Hall A at Jefferson Lab 3 mai 2004 Lire la suite ### Parity violating electron deuteron scattering and the proton's neutral weak axial vector form-factor 6 avril 2004 We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at backward angles at Q2= 0.038 (GeV/c)2. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon, which can potentially receive (...) Lire la suite ### Parity violating electron deuteron scattering and the proton's neutral weak axial vector form-factor 6 avril 2004 We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at backward angles at Q2= 0.038 (GeV/c)2. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon, which can potentially receive (...) Lire la suite ### New measurement of parity violation in elastic electron-proton scattering and implications for strange form factors 1er avril 2003 Lire la suite ### New measurement of parity violation in elastic electron-proton scattering and implications for strange form factors 1er avril 2003 Lire la suite ### Measurement of$G_{Ep}/G_{Mp}$in$\vec{e}p\rightarrow e\vec{p}$to$Q^2 = 5.6 GeV^2$18 mars 2002 Lire la suite ### Measurement of$G_{Ep}/G_{Mp}$in$\vec{e}p\rightarrow e\vec{p}$to$Q^2 = 5.6 GeV^2$18 mars 2002 Lire la suite ### Virtual Compton scattering at MAMI$\gamma^*p \rightarrow \gamma^'p'$28 septembre 2001 Lire la suite ### Virtual Compton scattering at MAMI$\gamma^*p \rightarrow \gamma^'p'$28 septembre 2001 Lire la suite ### Dynamics of the$^{16}$O(e,e'p) cross section at high missing energies 25 juin 2001 We measured the cross section and response functions (R_L, R_T, and R_LT) for the 16O(e,e'p) reaction in quasielastic kinematics for missing energies 25 <= E_miss <= 120 MeV at various missing momenta P_miss <= 340 MeV/c. For 25 < E_miss < 50 MeV and 1s1/2-state. At (...) Lire la suite ### Dynamics of the$^{16}$O(e,e'p) cross section at high missing energies 25 juin 2001 We measured the cross section and response functions (R_L, R_T, and R_LT) for the 16O(e,e'p) reaction in quasielastic kinematics for missing energies 25 <= E_miss <= 120 MeV at various missing momenta P_miss <= 340 MeV/c. For 25 < E_miss < 50 MeV and 1s1/2-state. At (...) Lire la suite ### Polarization transfer in the${16}O$($\vec{e},e'\vec{p}$)$^{15}$N reaction. 10 octobre 2000 The first (e,e'p) polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction 16O(e,e'p) were measured in quasielastic perpendicular kinematics (...) Lire la suite ### Polarization transfer in the${16}O$($\vec{e},e'\vec{p}$)$^{15}$N reaction. 10 octobre 2000 The first (e,e'p) polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction 16O(e,e'p) were measured in quasielastic perpendicular kinematics (...) Lire la suite ### The first dedicated Virtual Compton Scattering experiment at MAMI 10 octobre 2000 Lire la suite ### The first dedicated Virtual Compton Scattering experiment at MAMI 10 octobre 2000 Lire la suite ### Virtual Compton Scattering and polarizabilities 10 octobre 2000 Virtual Compton Scattering (VCS) of the proton below pion threshold allows access to generalized polarizabilities of the proton. These observables measure the response of the nucleon to low energy electromagnetic field perturbations. This paper presents a comparison with Real Compton Scattering (...) Lire la suite ### Virtual Compton Scattering and polarizabilities 10 octobre 2000 Virtual Compton Scattering (VCS) of the proton below pion threshold allows access to generalized polarizabilities of the proton. These observables measure the response of the nucleon to low energy electromagnetic field perturbations. This paper presents a comparison with Real Compton Scattering (...) Lire la suite ### Field mapping of the Hall A high-resolution spectrometers of the Thomas Jefferson National Accelerator Facility (Jefferson Lab) 10 octobre 2000 Lire la suite ### Field mapping of the Hall A high-resolution spectrometers of the Thomas Jefferson National Accelerator Facility (Jefferson Lab) 10 octobre 2000 Lire la suite ### Virtual Compton Scattering on the nucleon. 26 avril 2000 Lire la suite ### Virtual Compton Scattering on the nucleon. 26 avril 2000 Lire la suite ### Dynamical relativistic effects in quasielastic 1p-shell proton knockout from$^{16}$O 12 avril 2000 Lire la suite ### Dynamical relativistic effects in quasielastic 1p-shell proton knockout from$^{16}$O 12 avril 2000 Lire la suite ### The first Virtual Compton Scattering experiment at MAMI 4 avril 2000 Lire la suite ### The first Virtual Compton Scattering experiment at MAMI 4 avril 2000 Lire la suite ### Real and virtual Compton scattering (experiments) 15 février 2000 Lire la suite ### Real and virtual Compton scattering (experiments) 15 février 2000 Lire la suite ###$G_{E_p}/G_{M_p}$ratio by polarization transfer in$\vec{e}p\rightarrow e\vec{p}$15 février 2000 The ratio of the proton's elastic electromagnetic form factors was obtained by measuring the transverse and longitudinal polarizations of recoiling protons from the elastic scattering of polarized electrons with unpolarized protons. The ratio of the electric to magnetic form factor is (...) Lire la suite ###$G_{E_p}/G_{M_p}$ratio by polarization transfer in$\vec{e}p\rightarrow e\vec{p}$15 février 2000 The ratio of the proton's elastic electromagnetic form factors was obtained by measuring the transverse and longitudinal polarizations of recoiling protons from the elastic scattering of polarized electrons with unpolarized protons. The ratio of the electric to magnetic form factor is (...) Lire la suite ### Virtual compton scattering at MAMI$\gamma^* p \rightarrow \gamma' p'$. 10 février 2000 Lire la suite ### Virtual Compton Scattering under$\pi^0$threshold at$Q^2$= 0.33 GeV$^2$. Preliminary results 26 octobre 1999 Lire la suite ### Measurement of the proton electromagnetic form factors via the spin transfer reaction$^1$H($\vec e$,e'$\vec p$) 22 octobre 1999 Lire la suite ### Monte Carlo simulation of Virtual Compton Scattering at MAMI 7 septembre 1999 Lire la suite ### Experimental aspects of Virtual Compton Scattering at MAMI 7 septembre 1999 Lire la suite ### Measurements of the deuteron elastic structure function$A(Q^2)$for$0.7\leq Q^2\leq 6.0$(GeV/c)$^2\$ at Jefferson Laboratory

10 mai 1999

The deuteron elastic structure function A(Q^2) has been extracted in the Q^2 range 0.7 to 6.0 (GeV/c)^2 from cross section measurements of elastic electron-deuteron scattering in coincidence using the Hall A Facility of Jefferson Laboratory. The data are compared to theoretical models based on (...)

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### Measurement of the neutral weak form-factors of the proton

10 mai 1999

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point (theta_lab = 12.3 degrees and Q^2=0.48 (GeV/c)^2) is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange (...)

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