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

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

The 9.2 keV nuclear transition in \(^{227}\)Th populated in the \(\beta\)-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 \(\delta^2\)(E2/M1)=0.695 \(\pm...

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Veröffentlicht in:arXiv.org 2021-01
Hauptverfasser: Kovalík, A, A Kh Inoyatov, Perevoshchikov, L L, Ryšavý, M, Filosofov, D V, Alexa, P, Kvasil, J
Format: Artikel
Sprache:eng
Schlagworte:
Admixtures
Beta decay
Internal conversion
Physics - Nuclear Experiment
Physics - Nuclear Theory
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Zusammenfassung:The 9.2 keV nuclear transition in \(^{227}\)Th populated in the \(\beta\)-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 \(\delta^2\)(E2/M1)=0.695 \(\pm\) 0.248 (|\(\delta\)(E2/M1)|=0.834 \(\pm\) 0.210) was determined. Nonzero value of \(\delta\)(E2/M1) raises a question about the existing theoretical interpretation of low-lying levels of \(^{227}\)Th.
ISSN:2331-8422
DOI:10.48550/arxiv.2101.04075