排序方式: 共有25条查询结果,搜索用时 15 毫秒
1.
G. A. Vermenulen A. Schuhl F. B. Rasmussen J. Joffrin M. Chapellier 《Journal of Low Temperature Physics》1989,76(1-2):43-64
A new method to measure the magnetization dependence of the viscosity in polarized liquid3He is presented. The magnetization is obtained by brute force polarization at 50 mK in magnetic fields up to 11 T; it is subsequently destroyed by saturation of the NMR signal. Irreversible heating due to the saturation and relaxation of the magnetization is easily observed using the viscometer. Comparison of the calculated temperature evolution with the behavior of the viscometer shows that the viscosity is slightly magnetization dependent. Our result, a relative increase of the viscosity of 0.3±0.15% for a polarization of 3.9% and a pressure of 30 bar, disagrees with a prediction based on the nearly metamagnetic model and the first measurement based on the rapid melting of polarized solid. 相似文献
2.
Chapellier Paul Lavenus Pierre Le Traon Olivier Dulmet Bernard 《Microsystem Technologies》2022,28(6):1485-1496
Microsystem Technologies - This paper presents recent advances on two dimensional length-extension mode (2D-LEM) quartz resonators providing high quality (Q) factor on resonances at a few MHz. The... 相似文献
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The scintillation properties of luminescent crystals are well known at room temperature. It is only recently, for the sake of dark matter and rare events searches that the studies have been extended to very low temperatures in the millikelvin range. Some little-known facts on the behaviour of bolometers1, and more specifically on scintillating ones, are recalled in a simple manner. A few experiments to better understand them are proposed. 相似文献
5.
L. Dumoulin L. Bergé J. Lesueur H. Bernas M. Chapellier 《Journal of Low Temperature Physics》1993,93(3-4):301-306
Thin alloy films with compositions leading to the Anderson metal-to-insulator transition can potentially lead to high detection sensitivities and adjustable input impedances as well as to excellent coupling to the heat absorber. We demonstrate some of these advantages in the case of Nb-Si films, whose bias power is shown to be at least 50 times that of NTD Ge detectors at about 30 mK. 相似文献
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X. Defay A. Broniatowski A. Juillard S. Marnieros M. Chapellier L. Dumoulin S. Collin L. Bergé F. Lalu X. F. Navick 《Journal of Low Temperature Physics》2008,151(3-4):896-901
A new design of an ionization-heat germanium detector for dark matter search is presented, based on the use of interleaved
electrodes for charge collection. This device allows active rejection of surface events by performing the appropriate cuts
in the charge measurement data. Test experiments were performed with a prototype device, fitted with annular collection electrodes
and with a neutron transmutation-doped Ge thermometer. Calibration runs with gamma and neutron sources demonstrate the remarkable
possibilities offered by this type of detector in terms of surface event discrimination.
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S. Marnieros L. Berge A. Broniatowski M. Chapellier S. Collin O. Crauste X. Defay Y. Dolgorouky L. Dumoulin A. Juillard F. Lalu C. Nones E. Olivieri 《Journal of Low Temperature Physics》2008,151(3-4):835-840
Near-surface-events are a major limitation to the performance of cryogenic massive germanium heat and ionisation detectors
for dark matter search, due to their incomplete charge collection. We present here a powerful method of surface event identification
based on the transient heat signal of a Ge bolometer, equipped with two NbSi high impedance thin film sensors. Calibration
runs using electrons and low energy gamma particles from a 109Cd source show highly effective surface event rejection down to the heat threshold energy. Neutron and gamma source calibrations
were realised to get information on the fiducial volume of the Ge absorber. First results from low background data taking
are discussed. 相似文献
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E. Olivieri L. Bergé M. Chapellier S. Collin Y. Dolgorouky L. Dumoulin A. Juillard S. Marnieros C. Nones 《Journal of Low Temperature Physics》2008,151(3-4):884-890
A new generation of germanium composite bolometers, equipped with NbSi thin films, has been developed in the framework of
the EDELWEISS experiment, presenting impressive surface event identification capabilities and a substantial improvement in the background
rejection of heat and ionization detectors. In this work we present a simple thermal model which explain the surface-event
identification mechanism via NbSi thin films sensors.
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9.
O. Martineau A. Benoît L. Berg A. Broniatowski L. Chabert B. Chambon M. Chapellier G. Chardin P. Charvin M. De Jsus P. Di Stefano D. Drain L. Dumoulin J. Gascon G. Gerbier E. Gerlic C. Goldbach M. Goyot M. Gros J. P. Hadjout S. Herv A. Juillard A. de Lesquen M. Loidl J. Mallet S. Marnieros N. Mirabolfathi L. Mosca X. -F. Navick G. Nollez P. Pari C. Riccio V. Sanglard L. Schoeffel M. Stern L. Vagneron The EDELWEISS Collaboration 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2004,530(3):426-439
Several aspects of the analysis of the data obtained with the cryogenic heat-and-ionization Ge detectors used by the EDELWEISS dark matter search experiment are presented. Their calibration, the determination of their energy threshold, fiducial volume and nuclear recoil acceptance are detailed. 相似文献
10.
M. Chapellier M. Bassou M. Devoret J. M. Delrieu N. S. Sullivan 《Journal of Low Temperature Physics》1985,59(1-2):45-81
Experimental studies of the nuclear spin-lattice relaxation times in BCC helium three are reported for high molar volumes and low temperatures close to the minimum in the melting curve. The results show the existence of a new relaxation mechanism at low temperatures with an approximately linear temperature dependence (T
1 T
–1). An analysis of the vacancy-induced relaxation shows that both the vacancy formation energy and the vacancy mobility decrease dramatically as a function of density on approaching the maximum possible molar volume (minimum density) of the solid. A possible interpretation of both the new relaxation mechanism and the vacancy properties is outlined. 相似文献