Status of the GERDA Phase II Upgrade

被引：0
|
作者：
Wagner, Victoria [1 ]
机构：
[1] Max Planck Inst Kernphys, Heidelberg, Germany
来源：
CETUP 2015 - WORKSHOP ON DARK MATTER, NEUTRINO PHYSICS AND ASTROPHYSICS & PPC 2015 - IXTH INTERNATIONAL CONFERENCE ON INTERCONNECTIONS BETWEEN PARTICLE PHYSICS AND COSMOLOGY | 2016年 / 1743卷
关键词：
DOUBLE-BETA DECAY; GE-76; SEARCH;
D O I：
10.1063/1.4953322
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The GERDA experiment is designed to search for neutrinoless double beta (0 nu beta beta) decay of Ge-76. In Phase I of the experiment a background index of 10(-2) cts /(keV.kg.yr) was reached. A lower limit on the half-life of the 0 nu beta beta decay of Ge-76 was set to 2.1.10(25) yr (at 90% C.L.). The aim of Phase II is to reach a sensitivity of the half-life of about 10(26) yr. To increase the exposure thirty new Broad Energy Germanium (BEGe) detectors have been produced. These detectors are distinct for their improved energy resolution and enhanced pulse shape discrimination of signal from background events. Further background reduction will be reached by a light instrumentation to read out argon scintillation light. In April 2015 the light instrumentation together with eight BEGe detectors has been successfully deployed in the GERDA cryostat. In a commissioning run it was shown that two of the major background components, external gamma-rays from Bi-214 and Tl-208 decays, were suppressed up to two orders of magnitude. We are confident to reach a background index of 10(-3) cts /(keV.kg.yr) which is the design goal for GERDA Phase II.
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页数：4
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