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

The isospin mixing was deduced in the compound nucleus 72 Kr 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 + 40 Ca at bombarding energy of 90 MeV characterized by isospin I = 0, and from the 31 P + 40 Ca at 82 MeV used as a reference. The ELIGANT 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 blue 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, δ c , 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.

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Publication Details

Journal
Physics Letters B
Published
2025-06-17
DOI
https://doi.org/10.1016/j.physletb.2025.139653
Citations
2
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
3.74
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article

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

M. Kmiecik, H. Pai, D. Nichita, D. Iancu et al.
2 citations
Physics Letters B
Nuclear physics research studies
3.74
article

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

M. Kmiecik, H. Pai, D. Nichita, D. Iancu, I. Gheorghe, R. Mărginean, V. Vasilca, A. Turturică, Soichiro Aogaki, Irina Dinescu, D. Kahl, S. Călinescu, A. Spătaru, R. Lică, A. D. Stoica, C. Clisu, M. Brezeanu, A. Rotaru, T. Petruse, Violeta Iancu, A. Dhal, D. L. Balabanski, Tatiana Tozar, A. State, F. Camera, O. Wieland, P. Constantin, L. Stan, D. A. Testov, A. Maj, A. Giaz, Catalin C. Neacsu, G.V. Turturică, Nicoleta Mihaela Doran, Sebastian Ionut Toma, R. Borcea, C. Costache, A. Pappalardo, A. Kuşoğlu, P.-A. Söderström, Radu E. Mihai, Cristina Niță, Andra Coman, I. Burducea, B. Million, N. Mărginean, S. Ujeniuc, Yi Xu, M. Cuciuc, N. Djourelov, M. Ciemała, A. Bracco, F. Zhu, A. T. Serban, Constantin Mihai, Fabio Crespi, C. Sotty, Gheorghe Ciocan, M. Boromiza
article en
2 citations

Abstract

The isospin mixing was deduced in the compound nucleus 72 Kr 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 + 40 Ca at bombarding energy of 90 MeV characterized by isospin I = 0, and from the 31 P + 40 Ca at 82 MeV used as a reference. The ELIGANT 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 blue 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, δ c , 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.

Physics Letters BVol. 868
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Center of Technology and Engineering for Nuclear Projects (RO), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Extreme Light Infrastructure - Nuclear Physics (RO)
Openalex Percentile: Top 8%
Nuclear physics research studies
3.74
DOIOpen Access PDFOpenAlex
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