# 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. Gilles Ban

Professeur ENSICAEN

Groupes :
Applications industrielles et médicales
Aval du cycle électronucléaire
Interactions fondamentales et nature du neutrino

ban lpccaen.in2p3.fr

Tel : +33 2 31 45 24 21

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-01642836] Measurement of the $^{8}Li$ half-life

22 novembre 2017

We report a new measurement of the Li8 half-life using a plastic scintillator and an ultrafast waveform digitizing module. The result, T1/2=(838.40±0.36) ms, improves by a factor of 2.5 the most precise result obtained so far and is furthermore deduced with negligible corrections due to dead (...)

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### [hal-01642863] Measurement of transverse polarization of electrons emitted in free neutron decay

22 novembre 2017

The final analysis of the experiment determining both components of the transverse polarization of electrons ($\sigma_T_1$, $\sigma_T_2$) emitted in the $\beta$-decay of polarized, free neutrons is presented. The T-odd, P-odd correlation coefficient quantifying $\sigma_T_2$, perpendicular to (...)

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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 (...)

Lire la suite

### [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-01641236] The Neutrons for Science Facility at SPIRAL-2

21 novembre 2017

The Neutrons For Science (NFS) facility is a component of SPIRAL-2 laboratory under construction at Caen (France). SPIRAL-2 is dedicated to the production of high intensity Radioactive Ions Beams (RIB). It is based on a high-power linear accelerator (LINAG) to accelerate deuterons beams in (...)

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### [hal-01641443] First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

21 novembre 2017

The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the $\beta^+$ decay of$^35$Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area (...)

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### [hal-01641067] Measurement of transverse polarization of electrons emitted in free neutron decay

21 novembre 2017

The final analysis of the experiment determining both components of the transverse polarization of electrons ($\sigma_T_1$, $\sigma_T_2$) emitted in the $\beta$-decay of polarized, free neutrons is presented. The T-odd, P-odd correlation coefficient quantifying $\sigma_T_2$, perpendicular to (...)

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### [hal-01641038] Measurement of the $^{8}Li$ half-life

21 novembre 2017

We report a new measurement of the Li8 half-life using a plastic scintillator and an ultrafast waveform digitizing module. The result, T1/2=(838.40±0.36) ms, improves by a factor of 2.5 the most precise result obtained so far and is furthermore deduced with negligible corrections due to dead (...)

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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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### [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 (...)

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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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### [in2p3-01377559] First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

7 octobre 2016

The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the decay of 35Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (...)

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### [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 (...)

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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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### [in2p3-01177776] Experimental study of a high intensity radio-frequency cooler

23 juillet 2015

Within the framework of the DESIR/SPIRAL-2 project, a radio-frequency quadrupole cooler named SHIRaC has been studied. SHIRaC is a key device of SPIRAL-2, designed to enhance the beam quality required by DESIR. The preliminary study and development of this device has been carried out at (...)

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### [in2p3-01177675] Estimate of the reactivity of the VENUS-F subcritical configuration using a Monte Carlo MSM method

20 juillet 2015

The GUINEVERE project was launched in 2006 in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This facility, hosted at the Belgian Nuclear Research Center SCK·CEN, couples the fast subcritical lead reactor VENUS-F with an external neutron source (...)

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### [in2p3-00089852] $\beta$-decay studies of neutron-rich K isotopes

3 juillet 2015

The beta decay of the neutron-rich nuclei $^51-53$K has been used to populate bound and unbound states in $^50-53$Ca. Measurements of gamma rays as well as beta-delayed neutrons enabled detailed decay schemes to be established and levels identified in $^50-53$Ca. A delayed one-neutron emission (...)

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### [in2p3-00134052] A telescope for monitoring fast neutron sources

1er juillet 2015

In the framework of nuclear waste management, highly radiotoxic long-lived fission products and minor actinides are planned to be transmuted in a sub-critical reactor coupled with an intense external neutron source. The latter source would be created by a high-energy proton beam hitting a high (...)

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### [in2p3-00022117] Nucleon-induced reactions at intermediate energies: New data at 96 MeV and theoretical status

1er juillet 2015

Double-differential cross sections for light charged particle production (up to A = 4) were measured in 96 MeV neutron-induced reactions, at the TSL Laboratory Cyclotron in Uppsala (Sweden). Measurements for three targets, Fe, Pb, and U, were performed using two independent devices, SCANDAL and (...)

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### [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 (...)

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### [in2p3-00113799] Spectral discrimination of Cerenkov radiation in scintillating dosimeters

1er juillet 2015

Radiation therapy accelerators require highly accurate dose deposition and the output must be monitored frequently and regularly. Ionization chambers are the primary tool for this control, but their size, their high voltage needed, and the correction needed for electrons make them unsuitable (...)

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### [in2p3-00258718] On-line monitoring of fluence distributions and imaging of scanning ion beams

1er juillet 2015

In this paper we describe the design of an ion beam monitor developed to control irradiations of biological samples with ions at GANIL (Grand Accélérateur National d'Ions Lourds). This device can be used as an on-line monitor to provide transverse fluence distributions for active scanning ion (...)

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1er juillet 2015

11 décembre 2008

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### 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 (...)

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7 novembre 2008

Future installations for radioactive ion beams aim at producing much higher intensities. Accompanying increases in unwanted (isobaric) contamination places more stringent requirements on beam purification, especially mass separation. This article describes the design, construction and first (...)

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### 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 (...)

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25 juillet 2008

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### Studies of neutron-induced light-ion production with the MEDLEY facility

22 juillet 2008

The growing interest in applications involving high-energy neutrons (E > 20 MeV) demands high-quality experimental data on neutron-induced reactions. Such data have been measured with the MEDLEY setup at the The Svedberg Laboratory (TSL), Uppsala, Sweden. It has been used to measure (...)

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### An improved neutron electric dipole moment experiment

1er juillet 2008

A new measurement of the neutron EDM, using Ramsey's method of separated oscillatory fields, is in preparation at the new high intensity source of ultra-cold neutrons (UCN) at the Paul Scherrer Institute, Villigen, Switzerland (PSI). The existence of a non-zero nEDM would violate both parity (...)

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### A neutron beam facility at SPIRAL-2

26 juin 2008

The future SPIRAL-2 facility is mainly composed of a high-power superconducting driver LINAC, delivering a high-intensity deuteron, proton and heavy ions beams. The first two beams are particularly well suited to the construction of a neutron beam and irradiation facility called Neutrons for (...)

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### On-line monitoring of fluence distributions and imaging of scanning ion beams

25 février 2008

In this paper we describe the design of an ion beam monitor developed to control irradiations of biological samples with ions at GANIL (Grand Accélérateur National d'Ions Lourds). This device can be used as an on-line monitor to provide transverse fluence distributions for active scanning ion (...)

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### An On-line Monitor for Fluence Distributions and Imaging of Scanning Ion Beams

6 décembre 2007

Clinical applications of hadron beams have generated a wide development of radiobiology experiments, especially at GANIL (Grand Accélérateur National d'Ions Lourds), an ion accelerator in Caen. Biological samples are irradiated with ions in order to observe the induced biological effects. As (...)

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### 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 (...)

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### Towards a new measurement of the neutron electric dipole moment

29 octobre 2007

Precision measurements of particle electric dipole moments (EDMs) provide extremely sensitive means to search for non-standard mechanisms of T (or CP) violation. For the neutron EDM, the upper limit has been reduced by eight orders of magnitude in 50 years thereby excluding several CP violation (...)

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### The neutron EDM project at PSI

2 octobre 2007

We propose to perform a new high precision measurement of the neutron Electric Dipole Moment (nEDM). Our goal is to reach an accuracy of $5\times10^-28$ e.cm or better, i.e an improvement of nearly two orders of magnitude over the present best measurement. Our experiment will use the new (...)

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### SHIRaC : an RFQ Cooler for high-intensity beams

24 septembre 2007

Future RIB facilities like Spiral2 will push the limits of production with higher intensities and more exotic beams. However, to achieve better experimental sensitivities and accuracies, a mass resolution of m/Δm ~ few 104 is necessary to separate the ions of interest and their isobaric (...)

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### Scintillating fiber dosimeter

19 juillet 2007

Radiotherapy treatments become more and more accurate, using techniques like IMRT. Their irradiation fields and dose depositions are small and complex, and only a few dosimeters are available for real time and in vivo control for photons as well as for electrons beams. In this context, a new (...)

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### Heavy ion beams monitoring for radiobiology applications

19 juillet 2007

We describe the design and the construction of an on-line ion beam monitor. The device provides accurate measurements for radiobiology experiments currently held at GANIL (Grand AccÃ©lÃ©rateur National d'Ions Lourds) in France. A prototype named IBIS (Ion Beam Inspection System) has been tested at (...)

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### Scandal - A facility for elastic neutron scattering studies in the 50-130 MeV range

11 juillet 2007

A facility for detection of scattered neutrons in the energy interval 50−130 MeV, SCANDAL (SCAttered Nucleon Detection AssembLy), is part of the standard detection system at the 20-180 MeV neutron beam facility of the The Svedberg Laboratory, Uppsala. It has primarily been used for studies of (...)

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### A neutron beam facility at SPIRAL-2

6 juillet 2007

The SPIRAL-2 facility, dedicated to the production of radioactive beams, is expected to be operational in 2011 in GANIL, Caen (France). A high-power, superconducting driver LINAC, delivering a high-intensity deuteron as well as proton and heavy ions beams, will be built. The deuterons and (...)

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### (n,Xn) measurements at 96 MeV

5 juillet 2007

Double differential cross section for neutron production were measured in 96MeV neutrons induced reactions at the TSL laboratory in Uppsala (Sweden). Measurements for Fe and Pb targets were performed using simultaneously two independent setups: DECOI-DEMON and CLODIA-SCANDAL. The double (...)

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5 juillet 2007

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28 juin 2007

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26 juin 2007

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### Nucleon-induced reactions at intermediate energies: New data at 96 MeV and theoretical status

20 juillet 2004

Double-differential cross sections for light charged particle production (up to A = 4) were measured in 96 MeV neutron-induced reactions, at the TSL Laboratory Cyclotron in Uppsala (Sweden). Measurements for three targets, Fe, Pb, and U, were performed using two independent devices, SCANDAL and (...)

Lire la suite