Degeneracy at 1871 keV in Cd 112 and implications for neutrinoless double electron capture
Degeneracy at 1871 keV in Cd 112 and implications for neutrinoless double electron capture
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Cd 112 中 1871 keV 的简并性及其对无中微子双电子俘获的影响
DOI：
10.1103/physrevc.80.032502
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发表时间：
2009
影响因子：
3.1
通讯作者：
S. Yates
中科院分区：
文献类型：
--
作者：
K. Green;P. Garrett;R. Austin;G. Ball;D. Bandyopadhyay;S. Colosimo;D. Cross;G. Demand;G. Grinyer;G. Hackman;W. D. Kulp;K. Leach;A. C. Morton;C. Pearson;A. Phillips;M. Schumaker;C. Svensson;J. Wong;J. Wood;S. Yates
对{sup 112}Ag和{sup 112}In进行了高统计量的{β}衰变测量，研究了{sup 112}Cd原子核的结构。在1871 keV能级的双重态中，0{sup +}成员被认为是{sup 112}Sn的中微子双电子捕获后可能的子态，其精确能量被确定为1871.137(72)keV （0{sub 4}{sup +}能级）和1870.743(54)keV （4{sub 2}{sup +}能级）。0{sub 4}{sup +}能级的性质被认为是入侵者的起源，这是计算从无中微子双电子捕获中提取中微子质量所需的核矩阵元素所必需的。
High-statistics {beta}-decay measurements of {sup 112}Ag and {sup 112}In were performed to study the structure of the {sup 112}Cd nucleus. The precise energies of the doublet of levels at 1871 keV, for which the 0{sup +} member has been suggested as a possible daughter state following neutrinoless double electron capture of {sup 112}Sn, were determined to be 1871.137(72) keV (0{sub 4}{sup +} level) and 1870.743(54) keV (4{sub 2}{sup +} level). The nature of the 0{sub 4}{sup +} level, required for the calculation of the nuclear matrix element that would be needed to extract a neutrino mass from neutrinoless double electron capture to this state, is suggested to be of intruder origin.