Experimental investigation of the 9.2 and 24.3 keV nuclear transitions in Th-227

0547313 - ÚJF 2022 RIV US eng J - Journal Article
Kovalík, Alojz - Inoyatov, A. K. - Perevoshchikov, L. L. - Ryšavý, Miloš - Filosofov, D. V. - Dadakhanov, J. A.
Experimental investigation of the 9.2 and 24.3 keV nuclear transitions in Th-227.
European Physical Journal A. Roč. 57, č. 10 (2021), č. článku 285. ISSN 1434-6001. E-ISSN 1434-601X
R&D Projects: GA MŠMT LTT18021
Institutional support: RVO:61389005
Keywords : Th-227 * Ac-227 * electron spectroscopy
OECD category: Nuclear physics
Impact factor: 3.131, year: 2021
Method of publishing: Limited access
https://doi.org/10.1140/epja/s10050-021-00577-7

The 9.2 and 24.3 keV nuclear transitions in Th-227 were studied in the beta(-) decay of Ac-227 employing the internal conversion electron spectroscopy. Values of (9244.6 +/- 0.8) and (24343.1 +/- 1.1) eV were determined for their energies. The 24.3 keV transition was found to be of the mixed (M1 + E2) multipolarity with the spectroscopic admixture parameter delta(2) (E2/M1)=(0.0116 +/- 0.0004). Energies of (24342.9 +/- 1.2), (28613.3 +/- 1.7), and (37860.2 +/- 2.0) eV were obtained respectively for the 24.3, 28. 6, and 37.8 keV transitions in Th-227 by means of the gamma-ray spectroscopy. Natural atomic-level widths of (14.1 +/- 0.5), (11.4 +/- 0.5), (6.9 +/- 0.4), (11.4 +/- 1.4), (8.6 +/- 1.2), and (6.0 +/- 0.7) eV for the M-1-, M-2-, M-3-, N-1-, N-2-, and N-3-subshells of thorium, respectively, were derived from conversion electron lines. The cross checking of the energy values of the 9.2, 15.1, and 24.3 keV nuclear transitions obtained by the ICES method is also given.
Permanent Link: http://hdl.handle.net/11104/0323576