Universität zu Köln

Reiter, P. ORCID: 0000-0003-3016-8210, Habs, D., Schwalm, D. and Thirolf, P. G. (2025). Decay properties of the fission isomer 236mU. The European Physical Journal A, 61 (7). pp. 1-17. Springer Nature. ISSN 1434-601X

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Abstract

[Artikel-Nr.: 158] The delayed γ decay and delayed fission of the shape isomer 236mU were measured using the Heidelberg-Darmstadt Crystal Ball spectrometer. It is demonstrated that the isomeric γ decay and the delayed fission represent two competing decay channels of the same isomeric state. This conclusion is supported by four independent observations: (i) the measured half-lives of the delayed γ decay and delayed fission are identical, (ii) the excitation energy of the isomer is the same for both decay pathways, (iii) the missing energy in the prompt energy balance is equal for both decays, and (iv) the prompt energy spectra populating the second minimum are in agreement. An improved statistical analysis of the γ decay indicates that the excitation energy of the isomeric ground state in the second minimum is 2814 ± 33 keV. The γ back decay proceeds through several cascades involving known 1− states of the normally deformed 236U. A direct single-step γ transition is excluded within the experimental sensitivity.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Reiter, P. UNSPECIFIED https://orcid.org/0000-0003-3016-8210 UNSPECIFIED Habs, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schwalm, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thirolf, P. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-809954
Identification Number:	10.1140/epja/s10050-025-01634-1
Journal or Publication Title:	The European Physical Journal A
Volume:	61
Number:	7
Page Range:	pp. 1-17
Number of Pages:	17
Date:	12 July 2025
Publisher:	Springer Nature
ISSN:	1434-601X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Nuclear Physics
Subjects:	Physics
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80995