论文标题
低能的内部转换$^{2.29m} $ th isomer
Internal conversion of the low energy $^{229m}$Th isomer in the Thorium anion
论文作者
论文摘要
通过内部转换（IC）频道，研究了一个异常低的核异构体的衰减过程。我们表明，核异构体的一半寿命为$ 6D_ {3/2}^37S_ {1/2}^2 $基础状态以及$ 6D_ {3/2}^2 7s_ {1/2}^2 7p_ 2 7p_ {1/2}^1 $ th $^ - $ $^ - $ $ $ \ $ \ $ \ YET $ \ YES 11.1.1.1.1.1.1.1.1.1.11.5 $ 1.11.11.1.1.1.11.11.1.11.11.11.11.11.11.11.1.5 $ \ y of。 $ 6D_ {3/2}^2 7S_ {1/2}^2 $ TH原子的基态状态。尽管通过额外的$ 6D_ {3/2} $或$ 7p_ {1/2} $电子衰减，但阴离子中的IC概率降低了。 This counterintuitive result is a consequence: a) of a decrease in the amplitudes of the $6d_{3/2}$ and $7s_{1/2}$ wave functions near the nucleus due to an increase in their diffuseness of upon the addition of extra electron, b) of mutual compensation in the IC probability due to a kinematic factor, which depends on the energy of the conversion electron in the continuum as $ e_c^{ - 1/2} $，以及$ e_c^{1/4} $电子波函数振幅的增长。
A process of the decay of the anomalously low lying nuclear isomer $^{229m}$Th$(3/2^+,8.28 \pm 0.17$ eV) in the Thorium anion (Th$^-$) via the internal conversion (IC) channel is studied. We show that the half life of the nuclear isomer in the $6d_{3/2}^37s_{1/2}^2$ ground state and in the $6d_{3/2}^2 7s_{1/2}^2 7p_{1/2}^1$ excited state of Th$^-$ is $\approx1.5$ and $\approx1.1$ times bigger than in the $6d_{3/2}^2 7s_{1/2}^2$ ground state of the Th atom. The IC probabilities in the anion decreases despite the decay via the additional $6d_{3/2}$ or $7p_{1/2}$ electrons. This counterintuitive result is a consequence: a) of a decrease in the amplitudes of the $6d_{3/2}$ and $7s_{1/2}$ wave functions near the nucleus due to an increase in their diffuseness of upon the addition of extra electron, b) of mutual compensation in the IC probability due to a kinematic factor, which depends on the energy of the conversion electron in the continuum as $E_c^{-1/2}$, and the $E_c^{1/4}$ growth of the amplitudes of the electron wave functions.
