Measurement of the 2 ? ß ß decay half-life and search for the 0 ? ß ß decay of Cd 116 with the NEMO-3 detector
Measurement of the 2 ? ß ß decay half-life and search for the 0 ? ß ß decay of Cd 116 with the NEMO-3 detector
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测量 2 ?
DOI：
10.1103/physrevd.95.012007
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发表时间：
2017
影响因子：
5
通讯作者：
Arnold R
中科院分区：
文献类型：
--
作者：
Arnold R
NEMO-3实验测量了衰变的半衰期，并寻找了衰变。在410 g的探测器上，用5.26 y的曝光量，观测到了对应于~（10）衰变到~（10）基态的事件，信背比约为12。衰变半衰期为T_1/22ν=[2.74±0.04（stat）±0.18（syst）]× 10 ~（19）y。在寻找衰变时，没有观察到高于预期背景的事件。确定半衰期的相应限度，以超过90% C.L.这对应于一个上限的有效马约拉纳中微子质量取决于核矩阵元素考虑。对其他产生衰变的机制，如违反R宇称的超对称粒子的交换、右手流和majoron发射等也得到了限制。
The NEMO-3 experiment measured the half-life of thedecay and searched for thedecay of. Using 410 g ofinstalled in the detector with an exposure of 5.26 y, () events corresponding to thedecay ofto the ground state ofhave been observed with a signal to background ratio of about 12. The half-life of thedecay has been measured to be T1/22ν=[2.74±0.04(stat)±0.18(syst)]×1019 y. No events have been observed above the expected background while searching fordecay. The corresponding limit on the half-life is determined to beat the 90% C.L. which corresponds to an upper limit on the effective Majorana neutrino mass ofdepending on the nuclear matrix elements considered. Limits on other mechanisms generatingdecay such as the exchange of R-parity violating supersymmetric particles, right-handed currents and majoron emission are also obtained.