arXiv:2101.04075·v2·Nuclear Experiment
Experimental evidence of (M1+E2) mixed character of the 9.2 keV transition in Th and its consequence for spin-interpretation of low-lying levels
A. Kovalík (1 and 2) · A. Kh. Inoyatov (1 and 3) · L. L. Perevoshchikov (1) · M. Ryšavý (2). D. V. Filosofov (1) · P. Alexa (4) · J. Kvasil (5) ((1) JINR Dubna, (2) NPI Řež near Prague, (3) Institute of Applied Physics, Tashkent, (4) Technical University, Ostrava, (5) Institute of Particle and Nuclear Physics, Prague)
Abstract
The 9.2 keV nuclear transition in Th populated in the -decay of 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 (E2/M1)=0.695 0.248 (|(E2/M1)|=0.834 0.210) was determined. Nonzero value of (E2/M1) raises a question about the existing theoretical interpretation of low-lying levels of Th.
Comments: 14 pages, 3 figures; typo in abstract corrected