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arXiv 1603.06363nucl-exhep-ex
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富集$^{106}$ CdWO $_4$晶体闪烁体与四个HPGe探测器同时探测$^{106}$ Cd的$2β$衰变

Search for $2β$ decay of $^{106}$Cd with enriched $^{106}$CdWO$_4$ crystal scintillator in coincidence with four HPGe detectors

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. Laub… 展开作者

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, V. I. Tretyak, I. A. Tupitsyna

摘要:

一个放射性纯钨酸镉晶体闪烁体,富集在$^{106}$镉到66%,质量为216克($^{106}$ CdWO $_4$),被用来寻找双β衰变过程中的$^{106}$镉在一个单一的低温恒温器与四个超低背景高纯锗探测器一致。$^{106}$ Cd中双β过程的新的改进的限制已被设置在$10^{20}- 10^{21}$年的水平上,经过13085小时的数据采集。特别是,在两个中微子电子捕获与正电子发射,$T_{1/2}^{2ν\varepsilonβ^+}\geq 1.1\times 10^{21}$年的半衰期限制,已达到理论预测的区域。在此半衰期限制下,$2ν\varepsilonβ^+$衰变的有效核基质元素被限定为$M^{2ν\varepsilonβ^+}_{eff}\le 1.1$。共振无中微子双电子俘获到$^{106}$ Pd的2718 keV、2741 keV和2748 keV激发态被限制在$T_{1/2} \geq (8.5\times10^{20}-1.4\times10^{21}$)yr能级。

英文摘要:

A radiopure cadmium tungstate crystal scintillator, enriched in $^{106}$Cd to 66%, with mass of 216 g ($^{106}$CdWO$_4$), was used to search for double beta decay processes in $^{106}$Cd in coincidence with four ultra-low background high purity germanium detectors in a single cryostat. New improved limits on the double beta processes in $^{106}$Cd have been set on the level of $10^{20}- 10^{21}$ yr after 13085 h of data taking. In particular, the half-life limit on the two neutrino electron capture with positron emission, $T_{1/2}^{2ν\varepsilonβ^+}\geq 1.1\times 10^{21}$ yr, has reached the region of theoretical predictions. With this half-life limit the effective nuclear matrix element for the $2ν\varepsilonβ^+$ decay is bounded as $M^{2ν\varepsilonβ^+}_{eff}\le 1.1$. The resonant neutrinoless double electron captures to the 2718 keV, 2741 keV and 2748 keV excited states of $^{106}$Pd are restricted at the level of $T_{1/2} \geq (8.5\times10^{20}-1.4\times10^{21}$) yr.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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