Data acquisition and analysis of the 76Ge double beta experiment in Gran Sasso 1990-2003

被引：132

作者：

Klapdor-Kleingrothaus, HV ^{[1
]}

Dietz, A ^{[1
]}

Krivosheina, IV ^{[1
]}

Chkvorets, O ^{[1
]}

机构：

[1] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2004年 / 522卷 / 03期

关键词：

neutrino mass and mixing; beta decay; double beta decay; HEIDELBERG-MOSCOW experiment; high purity; Ge-detectors; Majorana neutrino;

D O I：

10.1016/j.nima.2003.12.013

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Data acquisition in a long-running underground experiment has its specific experimental challenges, concerning data acquisition, stability of the experiment and background reduction. These problems are addressed here for the HEIDELBERG-MOSCOW experiment, which collected data in the period August 1990-May 2003. The measurement and the analysis of the data are presented. The duty cycle of the experiment was similar to80%, and the collected statistics is 71.7 kg year. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg year keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events. The confidence level for the neutrinoless signal has been improved to a 4sigma level. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：371 / 406

页数：36

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