Search for trinucleon decay in the MAJORANA DEMONSTRATOR
Search for trinucleon decay in the MAJORANA DEMONSTRATOR
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DOI：
10.1103/physrevd.99.072004
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发表时间：
2019-04-12
影响因子：
5
通讯作者：
Zhu, B. X.
中科院分区：
文献类型：
--
作者：
Alvis, S. I.;Arnquist, I. J.;Zhu, B. X.
MAJORANA DEMONSTRATOR是一个寻找Ge-76中无中微子双β衰变的超低背景实验。位于南达科他州铅市的桑福德地下研究设施中，有一排严密屏蔽的锗探测器，放置在地下近一英里处，也可以用来搜索新的奇异物理。我们提出了三核子衰变特有模式和Ge同位素不可见衰变模式的第一极限。我们发现Ge-76（ppn）-> Zn-73 e（+）pi（+）衰变的半衰期极限为4.9 × 10（25）年，Ge-76（ppp）-> Cu-73 e（+）pi（+）衰变的半衰期极限为4.7 × 10（25）年。Ge-76的不可见三质子衰变模式的半衰期极限为7.5 × 10（24）年。
The MAJORANA DEMONSTRATOR is an ultra-low-background experiment searching for neutrinoless double-beta decay in Ge-76. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. We present the first limits for trinucleon decay-specific modes and invisible decay modes for Ge isotopes. We find a half-life limit of 4.9 x 10(25) yr for the decay Ge-76(ppn) -> Zn-73 e(+)pi(+) and 4.7 x 10(25) yr for the decay Ge-76(ppp) -> Cu-73 e(+)pi(+)pi(+). The half-life limit for the invisible triproton decay mode of Ge-76 was found to be 7.5 x 10(24) yr.