# Laboratoire de Physique Corpusculaire de Caen

## Partenaires

### Nos tutelles

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

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Organigrammes

Contacts

## M. Thomas Lefort

Maître de conférences UCBN

Groupe : Interactions fondamentales et nature du neutrino

Tél : +33 2 31 45 24 12

PUBLICATIONS

### [hal-01645919] Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields

24 novembre 2017

We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^199$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal (...)

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### [hal-01642614] Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields

22 novembre 2017

We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^199$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal (...)

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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-01642856] Neutron production in neutron-induced reactions at 96 MeV on $^{56}Fe$ and $^{208}Pb$

22 novembre 2017

Double-differential cross sections for neutron production were measured in 96-MeV neutron-induced reactions at The Svedberg Laboratory in Uppsala, Sweden. Measurements for Fe and Pb targets were performed using two independent setups: DECOI-DEMON, time-of-flight telescope dedicated to the (...)

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### [hal-01642943] An endoscopic detector for ultracold neutrons

22 novembre 2017

A new versatile detector for ultracold neutrons (UCN) has been built and operated which combines multi-pixel photon counters and GS10 lithium-doped scintillators. Such detectors can be very small and can be used to monitor UCN inside storage vessels or guides with negligible influence (of order (...)

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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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### [hal-01641060] Neutron production in neutron-induced reactions at 96 MeV on $^{56}Fe$ and $^{208}Pb$

21 novembre 2017

Double-differential cross sections for neutron production were measured in 96-MeV neutron-induced reactions at The Svedberg Laboratory in Uppsala, Sweden. Measurements for Fe and Pb targets were performed using two independent setups: DECOI-DEMON, time-of-flight telescope dedicated to the (...)

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### [hal-01641147] An endoscopic detector for ultracold neutrons

21 novembre 2017

A new versatile detector for ultracold neutrons (UCN) has been built and operated which combines multi-pixel photon counters and GS10 lithium-doped scintillators. Such detectors can be very small and can be used to monitor UCN inside storage vessels or guides with negligible influence (of order (...)

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### [hal-01642149] First tests of $^6$Li doped glass scintillators for ultracold neutron detection

21 novembre 2017

We report the results of test measurements aimed at determining the performances of 6 Li doped glass scintillators for the detection of ultra-cold neutrons. Four types of scintillators, GS1, GS3, GS10 and GS20, which differ by their 6 Li concentrations, have been tested. The signal to (...)

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### [in2p3-01597497] First tests of Li-6 doped glass scintillators for ultracold neutron detection

28 septembre 2017

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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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### [in2p3-01227909] Observation of Gravitationally Induced Vertical Striation of Polarized Ultracold Neutrons by Spin-Echo Spectroscopy

13 novembre 2015

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a vertical bar B-0 vertical bar = 1 mu T magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic (...)

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

6 novembre 2015

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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### [in2p3-01159876] 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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### [in2p3-00010822] Emission time scale of light particles in the system Xe+Sn at 50 A.MeV - A probe for dynamical emission ?

3 juillet 2015

Proton and deuteron correlation functions have been investigated with both impact parameter and emission source selections. The correlations of the system 129Xe+NatSn at 50 AMeV have been measured with the 4π INDRA which provides a complete kinematical description of each event. The emission (...)

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3 juillet 2015

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3 juillet 2015

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3 juillet 2015

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### [in2p3-00003952] Study of intermediate velocity products in the Ar+Ni collisions between 52 and 95 A.MeV

3 juillet 2015

Intermediate velocity products in Ar+Ni collisions from 52 to 95 A.MeV are studied in an experiment performed at the GANIL facility with the 4$\pi$ multidetector INDRA. It is shown that these emissions cannot be explained by statistical decays of the quasi-projectile and the quasi-target in (...)

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3 juillet 2015

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### [in2p3-00003421] Is reducibility in nuclear multifragmentation related to thermal scaling?

3 juillet 2015

Thermal scaling (Arrhenius law for an “elementary” probability p of binomial function) and reducibility in intermediate mass fragments (IMF's) production are examined for data of the reaction 129Xe+ natSn at 50 MeV/u. The study of the longitudinal velocities and of the average transverse energies (...)

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### [in2p3-00005978] Evidence for dynamical proton emission in peripheral Xe + Sn collisions at 50 MeV/u

3 juillet 2015

Relative angle correlation functions for mid-rapidity protons built up from 50 MeV/u Xe+Sn data recorded by the INDRA multidetector exhibit the characteristics of a non-equilibrated emission: they show an energy dependent anisotropy which cannot be accounted for by standard evaporation (...)

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### [in2p3-00005276] Digital filtering a common analysis for data and mean field theories in heavy-ions collisions at intermediate energy

3 juillet 2015

To select well-defined event configurations from heavy-ion collisions in the Fermi energy domain, a digital filtering technique of the charge density distribution along the deflection axis in the velocity space is presented. Charge density appears as a robust variable and can be used for a (...)

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### [in2p3-00003451] Surveying the nuclear caloric curve

3 juillet 2015

The 4π array INDRA was used to detect nearly all charged products emitted in Ar + Ni collisions between 52 and 95 MeV/u. The charge, mass and excitation energy E∗ of the quasi-projectiles have been reconstructed event by event. Excitation energies up to 25 MeV per nucleon are (...)

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### [in2p3-00000114] A hot expanding source in 50 A MeV Xe+Sn central reactions

3 juillet 2015

The INDRA multidetector has been used to study multifragmentation processes in central collisions for the Xe + Sn reaction at 50 A MeV. A single isotropic source formed at an excitation energy of 12 A MeV exhausting most of the emitted charged products has been isolated in such collisions. The (...)

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3 juillet 2015

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### [in2p3-00000038] Independence of fragment charge distributions of the size of heavy multifragmenting sources

3 juillet 2015

Charged product multiplicities and Z distributions were measured for single multifragmenting sources produced in collisions between Full-size image ( 1 K) and Full-size image ( 1 K) at the same available energy per nucleon. Z distributions are found identical for both reactions while fragment (...)

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3 juillet 2015

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3 juillet 2015

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3 juillet 2015

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1er juillet 2015

29 juin 1999

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29 juin 1999

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29 juin 1999

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25 novembre 1998

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25 novembre 1998

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20 novembre 1998

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9 novembre 1998

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9 novembre 1998

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9 novembre 1998

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