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Isospin mixing in Ga64,66 reexamined via total absorption spectroscopy

S. Parra1, E. Nácher1,*, B. Rubio1, W. Gelletly2, J. A. Briz3, J. Agramunt1, A. Algora1,4, P. Aguilera5, T. Berry2 et al. (ISOLDE Collaboration)

T. Berry2, M. J. G. Borge6, M. Carmona-Gallardo6, L. M. Fraile3, A. Illana3, E. Ganioglu7, V. Guadilla8, U. Köster9, R. Lică10, I. Marroquín6, F. Molina5, A. B. Morales1, B. S. Nara Singh11, J. N. Orce12,13, S. E. A. Orrigo1, A. Perea6, J. Romero-Barrientos5, C. Sotty10, O. Tengblad6, J. L. Taín1, A. Tolosa-Delgado14, V. Vaquero6, and V. Vedia14 (ISOLDE Collaboration)

  • *Contact author: enrique.nacher@csic.es
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Phys. Rev. C 112, 064328 – Published 24 December, 2025

DOI: https://doi.org/10.1103/14qx-4jh6

Abstract

New measurements of the β decay of Ga64 and Ga66 have been carried out using total absorption spectroscopy at CERN-ISOLDE. The purpose of the study was to determine whether systemic effects such as Pandemonium have affected previous measurements and also determine the degree of isospin mixing in these proton-rich nuclei. Our results show that the β strength distribution of Ga64 was previously underestimated, while that of Ga66 agrees well with previous high-resolution measurements. The results allowed us to determine the amount of isospin mixing in the 0+→0+ transitions to the ground states of the daughter nuclei. From the extracted logft values, we determined the isospin mixing parameter α for the two cases. They were found to be consistent with values for similar transitions in other nuclei. Ga64 exhibits the largest amount of isospin mixing in such nuclei. These findings improve our understanding of beta decay and have implications for nuclear structure models and medical applications of Ga66 in PET imaging.

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Phys. Rev. C 112, 064328– Published 24 December, 2025
  • Received 21 July 2025
  • Accepted 24 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by CERN.

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