Systematics of Evaluated Half-Lives of Double-Beta Decay

Abstract

A new evaluation of 2beta-decay half lives and their systematics is presented. These data extend the previous evaluation and include the analysis of all recent measurements. The nuclear matrix elements for 2beta-decay transitions in 12 nuclei have been extracted. The recommended values are compared with the large-scale shell-model, QRPA calculations, and experimental data. A T2nu 1/2 ~ 1/E8 systematic trend has been observed for recommended 128,130Te values. This trend indicates similarities for nuclear matrix elements in Te nuclei and was predicted for 2beta(2nu)-decay mode. The complete list of results is available online at http://www.nndc.bnl.gov/bbdecay/.

4 pages, 3 tables, 1 figure

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• Large-scale shell-model study of two-neutrino double-beta decay of ${}^{82}$Se, ${}^{94}$Zr, ${}^{108}$Cd, ${}^{124}$Sn, ${}^{128}$Te, ${}^{130}$Te, ${}^{136}$Xe, and ${}^{150}$Nd
• Comprehensive Review of 2$\beta$ Decay Half-Lives
• Imperfect World of $\beta \beta$-decay Nuclear Data Sets?