https://doi.org/10.1140/epja/s10050-024-01470-9
Regular Article - Experimental Physics
Characterization of isomers produced by the spontaneous fission of 252Cf with the VESPA setup
1
CEA/DES/IRESNE/DER/SPRC/LEPh, Cadarache, 13108, Saint-Paul lez Durance, France
2
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
3
Department of Physics and Astronomy, Uppsala University, Box 516, 751 20, Uppsala, Sweden
4
European Commission, Joint Research Centre, Directorate for Nuclear Safety and Security, 2440, Geel, Belgium
5
Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), 077125, Bucharest-Magurele, Romania
a
valentin.piau@ijclab.in2p3.fr
Received:
24
June
2024
Accepted:
7
December
2024
Published online:
16
January
2025
Isomers produced by spontaneous fission of Cf were measured with the VESPA setup, composed of
(Ce) detectors for fast
-ray spectroscopy and an ionization chamber for detecting fission fragments. Identification of the isomers was derived from fission fragment-
-
coincidences. This paper presents the half-lives of 41 isomeric states measured with this setup, from less than a nanosecond up to tens of microseconds. Short-lived isomers in
Rb,
Tc, and
Ce are reported for the first time. In addition to this half-life analysis, the isomers are used to develop and test a nuclear charge calibration of the ionization chamber.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.