Latest results from the HEIDELBERG-MOSCOW double beta decay experiment

被引：582

作者：

Klapdor-Kleingrothaus, HV

Dietz, A

Baudis, L

Heusser, G

Krivosheina, IV

Majorovits, B

Paes, H

Strecker, H

Alexeev, V

Balysh, A

Bakalyarov, A

Belyaev, ST

Lebedev, VI

Zhukov, S

机构：

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

[2] Russian Sci Ctr, Kurchatov Inst, Moscow 123182, Russia

来源：

EUROPEAN PHYSICAL JOURNAL A | 2001年 / 12卷 / 02期

关键词：

D O I：

10.1007/s100500170022

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：

New results for the double beta decay of Ge-76 are presented. They are extracted from data obtained with the HEIDELBERG-MOSCOW experiment, which operates five enriched 76Ge detectors in an extreme low-level environment in the Gran Sasso underground laboratory. The two-neutrino-accompanied double beta decay is evaluated for the first time for all five detectors with a statistical significance of 47.7kgy resulting in a half-life of T-1/2(2 nu) = [1.55 +/- 0.01(stat) (+0.19)(-0.15)(syst)] x 10(21) y. The lower limit on the half-life of the 0 nu beta beta decay obtained with pulse shape analysis is T-1/2(0 nu) > 1.9 x 10(25) (3.1 x 10(25)) y with 90% C.L. (68% C.L.) (with 35.5 kgy). This results in an upper limit of the effective Majorana-neutrino mass of 0.35 eV (0.27 eV) using the matrix elements of A. Staudt et al.'s work (Europhys. Lett. 13, 31 (1990)). This is the most stringent limit at present from double beta decay. Nio evidence for a majoron-emitting decay mode is observed.

引用

页码：147 / 154

页数：8

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