31 documents found, page 1 of 4
First results on FHM — a Floating Hole Multiplier
Chepel, V.; Martínez-Lema, G.; Roy, A.; Breskin, A.A proof of principle of a novel concept for event recording in dual-phase liquid xenon detectors — the Floating Hole Multiplier (FHM) — is presented. It is shown that a standard Thick Gaseous Electron Multiplier (THGEM), freely floating on the liquid xenon surface permits extraction of electrons from the liquid to the gas. Secondary scintillation induced by the extracted electrons in the THGEM holes as well as ...
A next-generation liquid xenon observatory for dark matter and neutrino physics
Aalbers, J.; AbdusSalam, S. S.; Abe, K.; Aerne, V.; Agostini, F.; Ahmed Maouloud, S.; Akerib, D. S.; Akimov, D. Y.; Akshat, J.; Al Musalhi, A. K.The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon timeprojection chamber is the leading technology to cover the available parameter space for weakly interacting massive particles, while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinol...
ANTS2 package: simulation and experimental data processing for Anger camera typ...
Morozov, A.; Solovov, V.; Martins, R.; Neves, F.; Domingos, V.; Chepel, V.ANTS2 is a simulation and data processing package developed for position sensitive detectors with Anger camera type readout. The simulation module of ANTS2 is based on ROOT package from CERN, which is used to store the detector geometry and to perform 3D navigation. The module is capable of simulating particle sources, performing particle tracking, generating photons of primary and secondary scintillation, trac...
Liquid Hole Multipliers: bubble-assisted electroluminescence in liquid xenon
Arazi, L.; Erdal, E.; Coimbra, A. E. C.; Rappaport, M.L.; Vartsky, D.; Chepel, V.; Breskin, A.
Measurement and simulation of the muon-induced neutron yield in lead
Reichhart, L. et al. (39 authors); Lindote, A.; Chepel, V.; DeViveiros, L.; Lopes, M.I.; Neves, F.; Pinto Da Cunha, J.; Silva, C.; Solovov, V.N.A measurement is presented of the neutron production rate in lead by high energy cosmic-ray muons at a depth of 2850m water equivalent (w.e.) and a mean muon energy of 260GeV. The measurement exploits the delayed coincidences between muons and the radiative capture of induced neutrons in a highly segmented tonne scale plastic scintillator detector. Detailed Monte Carlo simulations reproduce well the measured ca...
WIMP-nucleon cross-section results from the second science run of ZEPLIN-III
Akimov, D.Yu. et al. (37 authors); Chepel, V.; DeViveiros, L.; Lindote, A.; Lopes, M.I.; Neves, F.; Pinto da Cunha, J.; Silva, C.; Solovov, V.N.We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at the Boulby Underground Laboratory. A raw fiducial exposure of 1,344 kg.days was accrued over 319 days of continuous operation between June 2010 and May 2011. A total of eight events was observed in the signal acceptance region in the nuclear recoil energy range 7-29 keV, which is co...
Position Reconstruction in a Dual Phase Xenon Scintillation Detector
Solovov, V.N. et al. (36 authors); Chepel, V.; DeViveiros, L.; Lindote, A.; Lopes, M.I.; Neves, F.; Pinto da Cunha, J.; Silva, C.We studied the application of statistical reconstruction algorithms, namely maximum likelihood and least squares methods, to the problem of event reconstruction in a dual phase liquid xenon detector. An iterative method was developed for in-situ reconstruction of the PMT light response functions from calibration data taken with an uncollimated gamma-ray source. Using the techniques described, the performance of...
Radioactivity Backgrounds in ZEPLIN-III
Araujo, H.M. et al. (37 authors); Chepel, V.; DeViveiros, L.; Lindote, A.; Lopes, M.I.; Neves, F.; Pinto da Cunha, J.; Silva, C.; Solovov, V.N.We examine electron and nuclear recoil backgrounds from radioactivity in the ZEPLIN-III dark matter experiment at Boulby. The rate of low-energy electron recoils in the liquid xenon WIMP target is 0.75$\pm$0.05 events/kg/day/keV, which represents a 20-fold improvement over the rate observed during the first science run. Energy and spatial distributions agree with those predicted by component-level Monte Carlo s...
Measurements of high-energy neutron-induced fission ofnatPb and209Bi
Tarrío, D.; Tassan-Got, L.; Audouin, L.; Berthier, B.; Duran, I.; Ferrante, L.; Isaev, S.; Le Naour, C.; Paradela, C.; Stephan, C.; Trubert, D.The CERN Neutron Time-Of-Flight (n TOF) facility is well suited to measure low cross sections as those of neutron-induced fission in subactinides. The cross section ratios of natPb and 209Bi relative to 235U and 238U were measured using PPAC detectors and a fragment coincidence method that allows us to identify the fission events. The present experiment provides first results for neutron-induced fission up to 1...
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