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Accueil > Recherche & Enseignement

M. Yves Lemière


Maître de conférences UCBN


Groupe : Interactions fondamentales et nature du neutrino


lemiere lpccaen.in2p3.fr


Tél : +33 2 31 45 29 64


 



PUBLICATIONS

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

18 février 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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[in2p3-01299739] 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 (...)

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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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[in2p3-01166055] 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 (...)

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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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[in2p3-01177619] 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.

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[in2p3-01079065] A measurement of the neutron to 199Hg magnetic moment ratio

1er juillet 2015

The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result $\gamma_\rm n/\gamma_\rm Hg = (...)

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[in2p3-01158512] Constraining interactions mediated by axion-like particles with ultracold neutrons

30 juin 2015

We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 1 mu T vertical magnetic (...)

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[in2p3-01062292] Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

30 juin 2015

The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by (...)

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[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 (...)

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[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 (...)

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The search for the neutron electric dipole moment at the Paul Scherrer Institute

17 novembre 2011

The measurement of the neutron electric dipole moment (nEDM) constrains the contribution of CP-violating terms within both the Standard Model and its extensions. The experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided the last (and best) limit (...)

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The search for the neutron electric dipole moment at the Paul Scherrer Institute

17 novembre 2011

The measurement of the neutron electric dipole moment (nEDM) constrains the contribution of CP-violating terms within both the Standard Model and its extensions. The experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided the last (and best) limit (...)

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An improved measurement of the electric dipole moment of the neutron

30 mai 2011

We describe the status of the new measurement of the neutron electric dipole moment (nEDM) to be performed at the strong source of ultra-cold neutrons at the Paul Scherrer Institut. The experimental technique is based on Ramsey's method of separated oscillatory fields, applied to UCN stored in (...)

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An improved measurement of the electric dipole moment of the neutron

30 mai 2011

We describe the status of the new measurement of the neutron electric dipole moment (nEDM) to be performed at the strong source of ultra-cold neutrons at the Paul Scherrer Institut. The experimental technique is based on Ramsey's method of separated oscillatory fields, applied to UCN stored in (...)

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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 (...)

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[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 (...)

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Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins

5 octobre 2010

Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the Universe using has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison (...)

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Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins

5 octobre 2010

Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the Universe using has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison (...)

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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 (...)

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[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 (...)

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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 (...)

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[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 (...)

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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 (...)

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[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 (...)

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New constraints on Lorentz invariance violation from the neutron electric dipole moment

28 juin 2010

We propose an original test of Lorentz invariance in the interaction between a particle spin and an electromagnetic field and report on a first measurement using ultracold neutrons. We used a high sensitivity neutron electric dipole moment (nEDM) spectrometer and searched for a direction (...)

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[in2p3-00495497] New constraints on Lorentz invariance violation from the neutron electric dipole moment

28 juin 2010

We propose an original test of Lorentz invariance in the interaction between a particle spin and an electromagnetic field and report on a first measurement using ultracold neutrons. We used a high sensitivity neutron electric dipole moment (nEDM) spectrometer and searched for a direction (...)

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Search for neutrinoless double beta decay with NEMO-3 using 150ND

21 juillet 2009

The NEMO-3 detector looks for neutrinoless double beta decay from 10 kg of enriched ββ emiters. Using 440 days of data, background measurements give activities from each contribution from Neodinium foil. During the same period of data acquisition, preliminary study gives the half-life of the 2νββ (...)

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Search for neutrinoless double beta decay with NEMO-3 using 150ND

21 juillet 2009

The NEMO-3 detector looks for neutrinoless double beta decay from 10 kg of enriched ββ emiters. Using 440 days of data, background measurements give activities from each contribution from Neodinium foil. During the same period of data acquisition, preliminary study gives the half-life of the 2νββ (...)

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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 (...)

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Recherche de la violation de conservation du nombre leptonique total par le processus de double désintégration bêta du 82Se et du 150Nd dans l'expérience NEMO3.<br />Étude du processus Bi-Po de la chaîne du thoron.

19 mai 2009

L'expérience NEMO-3 recherche un signal de double désintégration bêta sans émission de neutrino (beta beta 0 nu) avec une sensibilité de l'ordre de 1024 années. L'observation de ce processus, interdit par le Modèle Standard car violant la conservation du nombre leptonique total, permettrait de (...)

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Recherche de la violation de conservation du nombre leptonique total par le processus de double désintégration bêta du 82Se et du 150Nd dans l'expérience NEMO3.<br />Étude du processus Bi-Po de la chaîne du thoron.

19 mai 2009

L'expérience NEMO-3 recherche un signal de double désintégration bêta sans émission de neutrino (beta beta 0 nu) avec une sensibilité de l'ordre de 1024 années. L'observation de ce processus, interdit par le Modèle Standard car violant la conservation du nombre leptonique total, permettrait de (...)

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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 (...)

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[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 (...)

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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 (...)

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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 (...)

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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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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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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 (...)

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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 (...)

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Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment

16 octobre 2006

The double beta decay of 100Mo to the 0+1 and 2+1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 0+1 state is measured to be T(2nu)_1/2 = [5.+1.3-0.9(stat)+/-0.8(syst)]x (...)

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[in2p3-00106943] Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment

16 octobre 2006

The double beta decay of 100Mo to the 0+1 and 2+1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 0+1 state is measured to be T(2nu)_1/2 = [5.+1.3-0.9(stat)+/-0.8(syst)]x (...)

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