Isospin mixing in Ga 64 , 66 reexamined via total absorption spectroscopy

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Abstract
New measurements of the β decay of Ga 64 and Ga 66 have been carried out using total absorption spectroscopy at CERN-ISOLDE. The purpose of the study was to determine whether systemic effects such as 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 Ga 64 was previously underestimated, while that of Ga 66 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 log f t 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. Ga 64 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 Ga 66 in PET imaging.
Funding Information
  • Janssen Research and Development (PID2022-138297NB-C21)
  • Janssen Research and Development (PID2022-140162NB-I00)
  • Janssen Research and Development (RTI2018-098868-B-I00)
  • Janssen Research and Development (PID2021-126998OB-I00)
  • Janssen Research and Development (PID2019-104714GB-C21)
  • Ministerio de Ciencia e Innovación (MCIN/AEI/10.13039/501100011033)
  • Generalitat Valenciana (CIPROM/2021/064)
  • Generalitat Valenciana (CIPROM/2022/9)
  • Science and Technology Facilities Council (ST/P005314)
  • Science and Technology Facilities Council (ST/Y000382/1)
  • Institutul de Fizică Atomică (PN 23 21 01 02)
  • National Research Foundation
  • Horizon 2020 Framework Programme (654002)
  • Grupo de Física Nuclear-UCM (910059)
  • South Africa's Department of Science, Technology and Innovation

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