scholarly journals Charge-carrier collective motion in germanium detectors for $$\beta \beta $$-decay searches

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Tommaso Comellato ◽  
Matteo Agostini ◽  
Stefan Schönert
Keyword(s):  
Beta Decay ◽  
Collective Motion ◽  
Initial Distribution ◽  
Double Beta Decay ◽  
Charge Carriers ◽  
Germanium Detectors ◽  
Time Analysis ◽  
High Purity Germanium ◽  
Typical Event ◽  
Comprehensive Study

AbstractThe time analysis of the signal induced by the drift of charge carriers in high purity germanium detectors provides information on the event topology. Millions of charge carriers are produced in a typical event. Their initial distribution, stochastic diffusion and Coulomb self-repulsion affect the time structure of the signal. We present a comprehensive study of these effects and evaluate their impact on the event discrimination capabilities for the three geometries which will be used in the Legend experiment for neutrinoless double-beta decay.

NEW RESULTS IN THE ITEP/YePI DOUBLE BETA-DECAY EXPERIMENT WITH ENRICHED GERMANIUM DETECTORS

1990 ◽  
Vol 05 (17) ◽  
pp. 1299-1306 ◽  
Author(s):  
A.A. VASENKO ◽  
I.V. KIRPICHNIKOV ◽  
V.A. KUZNETSOV ◽  
A.S. STAROSTIN ◽  
A.G. DJANYAN ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Beta Decay ◽  
Half Life ◽  
Maximum Likelihood Method ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Likelihood Method ◽  
Salt Mine ◽  
Germanium Detectors ◽  
Double Beta Decay Experiment

The search for double beta-decay of 76 Ge was carried out with a detector fabricated of enriched material (85% abundance of 76 Ge compared with 7.8% natural abundance). Measurements have been performed by the ITEP/YePI team in the Avan salt mine, 245 meters underground, situated in Yerevan, Armenia. Evidence for two-neutrino double beta-decay of 76 Ge with half-life of T1/2(2v)=(9±1) · 1020 y was obtained. New limits for neutrinoless double beta-decay, T1/2(0v)>1.3×1024 y, and double beta-decay with majoron emission T1/2(0v, B)>1×1022 y were obtained at 68% CL from mean background fluctuations. Limit for 0v-decay derived by the maximum likelihood method was T1/2>2.0×1024 y.

scholarly journals Status of the GERDA Experiment at the Laboratori Nazionali del Gran Sasso

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
R. Brugnera ◽  
A. Garfagnini
Keyword(s):  
Beta Decay ◽  
High Purity ◽  
Pulse Shape ◽  
Germanium Detector ◽  
Liquid Argon ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Second Phase ◽  
High Purity Germanium ◽  
Better Than

The Germanium Detector Array (Gerda) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) of the INFN designed to search for the rare neutrinoless double beta decay (0νββ) of76Ge. In its first phase, high purity germanium diodes inherited from the former Heidelberg-Moscow and Igexexperiments are operated “bare” and immersed in liquid argon, with an overall background environment of 10−2 cts/(keV·kg·yr), a factor of ten better than its predecessors. Measurements on two-neutrino double beta decay (2νββ) givingT1/22ν=(1.88±0.10)×1021 yrand recently published background model and pulse shape performances of the detectors are discussed in the paper. A new result on0νββhas been recently published with a half-life limit on0νββdecayT1/20ν>2.1×1025 yr(90% C.L.). A second phase of the experiment is scheduled to start during the year 2014, after a major upgrade shutdown. Thanks to the increased detector mass with new designed diodes and to the introduction of liquid argon instrumentation techniques, the experiment aims to reduce further the expected background to about 10−3 cts/(keV·kg·yr) and to improve the0νββsensitivity to aboutT1/20ν>1.5×1026 yr(90% C.L.).

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