Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-09-06
Nucl.Instrum.Meth. A479 (2002) 498-510
Physics
High Energy Physics
High Energy Physics - Experiment
25 pages, 3 tables, 6 figures
Scientific paper
10.1016/S0168-9002(01)00929-9
Scintillating crystal detector offers potential advantages in low-energy low-background experiments for particle physics and astrophysics. The GSO crystal is an interesting detector to explore for future neutrino physics experiments. The contributions to background due to the various channels of intrinsic radio-isotopes from the Th-232 and U-238 series are identified and studied with time-correlation analysis and detailed fits to the spectral shape. Good agreement is achieved between measured and simulated spectra, indicating background suppression factors to the 10^{-2} - 10^{-3} level are possible. The procedures can be adopted for background understanding and suppression in other low-count-rate experiments where the dominant source of background is from internal radioactivity. Based on 1656 hours of data taking, limits on the double beta decay half-life for the various channels in Gd-160 are presented. The limit for the neutrinoless mode is T^{0 \nu \beta \beta}_{{1/2}} > 2.0(0.8) X 10^{20} y at 68(90)% confidence level.
Fujiwara Motoyasu
Wang Samuel C.
Wong Henry T.
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