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arXiv 1002.1608nucl-th
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~(76)Ge ~(76)Se双β衰变系统的理论平均场和实验占据几率

Theoretical mean field and experimental occupation probabilities in the double beta decay system 76Ge to 76Se

O. Moreno, E. Moya de Guerra, P. Sarriguren, Amand Faessler

摘要:

在双β衰变体系76 Ge ~ 76 Se中,采用BCS配对的Woods-Saxon单粒子能级不能再现质子和中子能级1 p_{3/2},1 p_{1/2},0 f_{5/2},0 g_{9/2}的实验占有几率.手动下移0 g_{9/2}水平可以解释数据,但并不令人满意。在这里,它表明,自洽Hartree-Fock+BCS的方法与实验变形76 Ge和76 Se可以决定性地提高与最近的数据占领概率由Schiffer等人和凯等人的协议。最好的协议与现有的数据76 Ge和76 Se,以及对邻居的同位素,当中子的自旋轨道强度被允许大于质子。双中微子双β衰变矩阵元也与数据一致。

英文摘要:

Usual Woods-Saxon single particle levels with BCS pairing are not able to reproduce the experimental occupation probabilities of the proton and neutron levels 1p_{3/2}, 1p_{1/2}, 0f_{5/2}, 0g_{9/2} in the double-beta decay system 76Ge to 76Se. Shifting down the 0g_{9/2} level by hand can explain the data but it is not satisfactory. Here it is shown that a selfconsistent Hartree-Fock+BCS approach with experimental deformations for 76Ge and 76Se may decisively improve the agreement with the recent data on occupation probabilities by Schiffer et al. and Kay et al. Best agreement with available data on 76Ge and 76Se, as well as on neighbor isotopes, is obtained when the spin-orbit strength for neutrons is allowed to be larger than that for protons. The two-neutrino double-beta decay matrix element is also shown to agree with data.

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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