Probing the isospin mixing in the 72Kr compound nucleus via GDR γ decay

Probing the isospin mixing in the 72Kr compound nucleus via GDR γ decay

The isospin mixing was deduced in the compound nucleus 72Kr at a low nuclear temperature around 1.3 MeV, from the γ decay of the giant dipole resonance. The γ rays from two compound-nucleus reactions were measured: from the 32 S + 40Ca at bombarding energy of 90 MeV characterized by isospin I = 0, a...

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Main Authors: Agnese Giaz, Oliver Wieland, Angela Bracco, Franco Camera, Soichiro Aogaki, Dimiter L. Balabanski, Maria Brezeanu, Ruxandra Borcea, Marian Boromiza, Ion Burducea, Stefana Calinescu, Adina Coman, Paul Constantin, Cristian Costache, Michał Ciemała, Gheorghe Ciocan, Cristina Clisu, Fabio C.L. Crespi, Mihai Cuciuc, Anukul Dhal, Irina Dinescu, Nikolay Djourelov, Nicoleta M. Florea, Ioana Gheorghe, Decebal Iancu, Violeta Iancu, David M. Kahl, Maria Kmiecik, Aslı Kuşoğlu, Razvan Lica, Adam Maj, Nicolae M. Mărginean, Raluca Mărginean, Constantin Mihai, Radu E. Mihai, Bénédicte Million, Catalin Neacsu, Dragos Nichita, Cristina R. Niţă, Haridas Pai, Alfio D. Pappalardo, Teodora Petruse, Adrian Rotaru, Andreea B. Serban, Pär-Anders Söderström, Cristophe O. Sotty, Anamaria Spătaru, Lucian Stan, Alexandru N. State, Alexandru Stoica, Dmitry A. Testov, Sebastian Toma, Tatiana Tozar, Andrei Turturică, Gabriel V. Turturică, Sorin Ujeniuc, Vlad Vasilca, Yi Xu, Fan Zhu
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Physics Letters B
Subjects:
Giant dipole resonance
Compound nucleus
Isospin mixing
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269325004149
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Summary:The isospin mixing was deduced in the compound nucleus 72Kr at a low nuclear temperature around 1.3 MeV, from the γ decay of the giant dipole resonance. The γ rays from two compound-nucleus reactions were measured: from the 32 S + 40Ca at bombarding energy of 90 MeV characterized by isospin I = 0, and from the 31 P + 40Ca at 82 MeV used as a reference. The ELIFANT array was employed at the Bucharest Tandem Laboratory, consisting of Compton-suppressed scintillator detectors. The statistical-model analysis of the measured spectra provided a mixing parameter of (3.5±0.8)%. This new point, being at the lowest temperature compared with the few other existing ones, can validate the predictions of the temperature dependence of the isospin mixing. The isospin-symmetry-breaking correction, δc, used for the Fermi super-allowed transitions was extracted from the present result of the isospin mixing and found to be consistent with β decay data, theoretical predictions, and previous experimental results.
ISSN:0370-2693

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