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arXiv 1601.05698nucl-exhep-ex
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~(106)Cd双β过程的新极限

New limits on double beta processes in 106-Cd

V. I. Tretyak, P. Belli, R. Bernabei, V. B. Brudanin, F. Cappella, V. Caracciolo, R. Cerulli, D. M. Chernyak, F. A. Danevich, S. d'Angelo, A. Di Marco, A. Incic… 展开作者

V. I. Tretyak, P. Belli, R. Bernabei, V. B. Brudanin, F. Cappella, V. Caracciolo, R. Cerulli, D. M. Chernyak, F. A. Danevich, S. d'Angelo, A. Di Marco, A. Incicchitti, M. Laubenstein, V. M. Mokina, D. V. Poda, O. G. Polischuk, I. A. Tupitsyna

摘要:

用质量为216 g(106-CdWO 4)的放射性纯钨酸镉晶体闪烁体(106-Cd富集到66%)与4个超低本底HPGe探测器在一个低温恒温器中同时探测106-Cd的双β衰变过程。在地下深处(3600 m w.e.)采集13085 h数据后,106-Cd双β过程的新改进半衰期限值已设定为1 e20 - 1 e21年。在INFN(意大利)的Gran Sasso国家实验室。特别是双中微子电子俘获与正电子发射T_(1/2)> 1.1e ~(21)yr的极限,已达到理论预测的范围。共振无中微子双电子俘获到~(106)-Pd的2718、2741和2748 keV激发态的能级限制在T_(1/2)> 8.5e ~(20)-1.4e ~(21)yr。

英文摘要:

A radiopure cadmium tungstate crystal scintillator, enriched in 106-Cd to 66%, with mass of 216 g (106-CdWO4) was used in coincidence with four ultra-low background HPGe detectors contained in a single cryostat to search for double beta decay processes in 106-Cd. New improved half-life limits on the double beta processes in 106-Cd have been set on the level of 1e20-1e21 yr after 13085 h of data taking deep underground (3600 m w.e.) at the Gran Sasso National Laboratories of INFN (Italy). In particular, the limit on the two neutrino electron capture with positron emission T1/2 >1.1e21 yr, has reached the region of theoretical predictions. The resonant neutrinoless double electron captures to the 2718, 2741 and 2748 keV excited states of 106-Pd are restricted on the level of T1/2 > 8.5e20 - 1.4e21 yr.

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