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arXiv 2101.04075nucl-exnucl-th
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$^{227}$ Th中9.2 keV跃迁(M1 + E2)混合特征的实验证据及其对低能级自旋解释的影响

Experimental evidence of (M1+E2) mixed character of the 9.2 keV transition in $^{227}$Th and its consequence for spin-interpretation of low-lying levels

A. Kovalík, A. Kh. Inoyatov, L. L. Perevoshchikov, M. Ryšavý, . D. V. Filosofov, P. Alexa, J. Kvasil

摘要:

用内转换电子能谱研究了$^{227}$ Ac的$β$ -衰变中布居的$^{227}$ Th的9.2keV核跃迁。其多极性为M1+E2混合型,光谱混合参数$δ^2$(E2/M1)=0.695 $\pm$ 0.248(|$δ$(E2/M1)|=0.834 $\pm$ 0.210)。$δ$的非零值(E2/M1)对$^{227}$ Th低水平的现有理论解释提出了质疑。

英文摘要:

The 9.2 keV nuclear transition in $^{227}$Th populated in the $β$-decay of $^{227}$Ac was studied by means of the internal conversion electron spectroscopy. Its multipolarity was proved to be of mixed character M1+E2 and the spectroscopic admixture parameter $δ^2$(E2/M1)=0.695 $\pm$ 0.248 (|$δ$(E2/M1)|=0.834 $\pm$ 0.210) was determined. Nonzero value of $δ$(E2/M1) raises a question about the existing theoretical interpretation of low-lying levels of $^{227}$Th.

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