Neutron Activation of 74Ge and 76Ge

被引：0
|
作者：
Meierhofer, G. [1 ]
Canella, L. [2 ]
Grabmayr, P. [1 ]
Jochum, J. [1 ]
Jolie, J. [3 ]
Kudejova, P. [4 ]
机构：
[1] Univ Tubingen, Kepler Ctr Astro & Particle Phys, D-72076 Tubingen, Germany
[2] Max Planck Inst Astrophys, D-85748 Garching, Germany
[3] Univ Koil, Inst Kernphys, D-50937 Cologne, Germany
[4] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
来源：
CNR '09: SECOND INTERNATIONAL WORKSHOP ON COMPOUND NUCLEAR REACTIONS AND RELATED TOPICS | 2010年 / 2卷
关键词：
DOUBLE-BETA DECAY;
D O I：
10.1051/epjconf/20100205002
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The upcoming GERDA and MAJORANA experiments will use germanium crystals, isotopically enriched in Ge-76 to search for the neutrinoless double beta decay (0 nu 2 beta). The very long half-life of 0 nu 2 beta (> 10(25) y for Ge-76) requires an extremely low background level. Neutrons induced by cosmic muons can be captured after thermalization by Ge-74 or Ge-76, followed by beta(-)-decay of Ge-75 and Ge-77 respectively. The prompt gamma-cascade after neutron capture and the beta-decay contribute to the total backround in these experiments. For a good estimation of the background the poorly known cross-sections for the Ge-74(n,gamma)Ge-75,Ge-75m reactions were measured using targets, isotopically depleted in Ge-76. Furthermore the prompt gamma-rays in Ge-77 were measured with isotopically enriched germanium targets. The results of the latter measurement were combined with the results of a dedicated coincidence measurement to reconstruct the prompt gamma-ray decay scheme.
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