Limits on Majoron modes of 116Cd neutrinoless 2β decay

被引:17
作者
Danevich, FA [1 ]
Georgadze, AS [1 ]
Kobychev, VV [1 ]
Kropivyansky, BN [1 ]
Nikolaiko, AS [1 ]
Ponkratenko, OA [1 ]
Tretyak, VI [1 ]
Zdesenko, YG [1 ]
机构
[1] Inst Nucl Res, UA-252650 Kiev, Ukraine
关键词
double beta decay; Majoron; Majoron-neutrino coupling constant;
D O I
10.1016/S0375-9474(98)00567-3
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
Measurements of Cd-116 double beta decay with the help of enriched (CdWO4)-Cd-116 crystal scintillators are in progress in the Solotvina Underground Laboratory. The last part of the exposition with the background rate 0.7 counts/y.kg.keV (in the region of Cd-116 0 nu 2 beta decay 2.7-2.9 MeV) is 22826 hours. For neutrinoless modes with emission of one and two Majorons, the limits T-1/2(0 nu M1) greater than or equal to 1.2 x 10(21) y and T-1/2(0 nu M2) greater than or equal to 2.6 x 10(20) y (90% C.L.) are determined. The above mentioned values give the restriction on the Majoron-neutrino coupling constant of g(M) less than or equal to 2.1 x 10(-4). To improve these results, an advanced set-up with four enriched (CdWO4)-Cd-116 detectors shielded by fifteen large (1.5-2 kg) CdWO4 crystals has been mounted. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:317 / 328
页数:12
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