Encontrados 23 documentos, a visualizar página 1 de 3
GEM operation in double-phase xenon
Balau, F.; Solovov, V.; Chepel, V.; Pereira, A.; Lopes, M.I.http://www.sciencedirect.com/science/article/B6TJM-4T7F5JF-5/2/897502f8049abd8c2dd3dffc3821f0fd
Measurement of single electron emission in two-phase xenon
Edwards, B.; Araújo, H. M.; Chepel, V.; Cline, D.; Durkin, T.; Gao, J.; Ghag, C.; Korolkova, E. V.; Lebedenko, V. N.; Lindote, A.; Lopes, M. I.http://www.sciencedirect.com/science/article/B6TJ1-4SWWT2R-1/1/e220f50dd0c4e31ff6877963d6b26778
The ZEPLIN II dark matter detector: Data acquisition system and data reduction
Alner, G. J.; Araújo, H. M.; Bewick, A.; Bungau, C.; Camanzi, B.; Carson, M. J.; Chagani, H.; Chepel, V.; Cline, D.; Davidge, D.; Davies, J. C.; Daw, E.ZEPLIN II is a two-phase (liquid/gas) xenon dark matter detector searching for WIMP-nucleon interactions. In this paper we describe the data acquisition system used to record the data from ZEPLIN II and the reduction procedures which parameterise the data for subsequent analysis. ; http://www.sciencedirect.com/science/article/B6TJM-4R40SHG-9/1/eea3463e234b214a8a5d521b721d303a
First limits on WIMP nuclear recoil signals in ZEPLIN-II: A two-phase xenon det...
Alner, G. J.; Araújo, H. M.; Bewick, A.; Bungau, C.; Camanzi, B.; Carson, M. J.; Cashmore, R. J.; Chagani, H.; Chepel, V.; Cline, D.; Davidge, D.Results are presented from the first underground data run of ZEPLIN-II, a 31 kg two-phase xenon detector developed to observe nuclear recoils from hypothetical weakly interacting massive dark matter particles. Discrimination between nuclear recoils and background electron recoils is afforded by recording both the scintillation and ionisation signals generated within the liquid xenon, with the ratio of these sig...
The ZEPLIN III Detector; Results from Surface Calibrations
Sumner, T. J.; Akimov, D. Yu.; Alner, G. J.; Araújo, H. M.; Bewick, A.; Bungau, C.; Burenkov, A. A.; Carson, M. J.; Chagani, H.; Chepel, V.; Cline, D.ZEPLIN-III is a direct dark-matter search instrument using liquid xenon as a target.Both the scintillation light and the ionisation charge are measured.The instrument has been built and it is currently being testing in a surface laboratory.We present results from some of the initial testing, including design thermal control system verification, photomultiplier calibration (including spectral measurements with 6...
Measuring the angular profile of the reflection of xenon scintillation light
Silva, C.P.; Pinto da Cunha, J.; Chepel, V.; Pereira, A.; Solovov, V.; Mendes, P.; Neves, F.; Lopes, M.I.A chamber designed for measuring the angular distribution of reflected ultraviolet vacuum light is described. We report first measurements of the reflection profile of xenon scintillation light by a polished copper surface and by polytetrafluoroethylene (PTFE). ; http://www.sciencedirect.com/science/article/B6TJM-4NTB92C-1/1/01c2ff1d3b516ce3fda2bd84949e2925
Operation of gas electron multipliers in pure xenon at low temperatures
Solovov, V.; Balau, F.; Neves, F.; Chepel, V.; Pereira, A.; Lopes, M.I.Operation of Gas Electron Multiplier (GEM) in ultra-pure xenon was studied for gas at 25 °C, cold but not saturated gas at -90 °C and saturated xenon vapour at -102 °C. The most stable operation was observed at -90 °C for which the maximum visible gain of 150 was obtained from a single GEM. The maximum gain of [approximate]40 was achieved for saturated xenon vapour at -102 °C and of [approximate]25 for two-phas...
Limits on spin-dependent WIMP-nucleon cross-sections from the first ZEPLIN-II data
Alner, G. J.; Araújo, H. M.; Bewick, A.; Bungau, C.; Camanzi, B.; Carson, M. J.; Cashmore, R. J.; Chagani, H.; Chepel, V.; Cline, D.; Davidge, D.The first underground data run of the ZEPLIN-II experiment has set a limit on the nuclear recoil rate in the two-phase xenon detector for direct dark matter searches. In this Letter the results from this run are converted into the limits on spin-dependent WIMP-proton and WIMP-neutron cross-sections. The minimum of the curve for WIMP-neutron cross-section corresponds to 7×10-2 pb at a WIMP mass of around 65 GeV....
Status and outlook of the neutron time-of-flight facility n_TOF at CERN
Gunsing, F.; Abbondanno, U.; Aerts, G.; Alvarez, H.; Álvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.The neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron flux per time-of-flight burst result in a much enhanced signal to background ratio for neutron capture of radioactive isotopes and makes this facility well suited for the measurement of high quality neutron-induced rea...
Neutron reactions and nuclear cosmo-chronology
Mosconi, M.; Heil, M.; Käppeler, F.; Mengoni, A.; Plag, R.; Fujii, K.; Gallino, R.; Aerts, G.; Terlizzi, R.; Abbondanno, U.; Álvarez-Pol, H.The [beta]-decay of 187Re represents a suited cosmo-chronometer for the age of the r-process abundances, since the radiogenic part of the daughter isotope 187Os is defined by the difference between the solar 187Os abundance and s-process contribution to 187Os. The latter component can be determined via the s-process systematics based on the stellar neutron capture cross sections of 186Os and 187Os. The laborato...
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