Q 值和双β 衰变核素 110Pd 的半衰期。

Q value and half-lives for the double-β-decay nuclide 110Pd.

机构信息

Max-Planck-Institut für Kernphysik, Heidelberg, Germany.

出版信息

Phys Rev Lett. 2012 Feb 10;108(6):062502. doi: 10.1103/PhysRevLett.108.062502.

DOI:10.1103/PhysRevLett.108.062502

Abstract

The 110Pd double-β decay Q value was measured with the Penning-trap mass spectrometer ISOLTRAP to be Q=2017.85(64) keV. This value shifted by 14 keV compared with the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay modes. In addition a new set of the relevant matrix elements has been calculated. The expected half-life of the two-neutrino mode was reevaluated as 1.5(6)×10(20) yr. With its high natural abundance, the new results reveal 110Pd to be an excellent candidate for double-β decay studies.

摘要

用 Penning 阱质谱仪 ISOLTRAP 测量了 110Pd 双β衰变 Q 值，得到 Q=2017.85(64)keV。与文献值相比，该值偏移了 14keV，精度提高了 17 倍，从而得到了两种双β衰变模式的新相空间因子。此外，还计算了一组新的相关矩阵元。重新评估了双β衰变模式的预期半衰期为 1.5(6)×10(20)yr。由于其高天然丰度，新的结果表明 110Pd 是双β衰变研究的极佳候选物。