l-forbidden Gamow-Teller β decay of Cu57
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Absolute branching ratios for the β decay of 57Cu to excited states up to 3.3 MeV in 57Ni have been determined, including the ℓ-forbidden Gamow-Teller transition to the first excited state in 57Ni. Four transitions to excited states at 0.768, 1.113, 2.443, and 3.007 MeV are observed in addition to the superallowed decay to the ground state of 57Ni. The measured branching ratio to the ground state is 89.9 ± 0.8% and the branching ratios to the four excited states are 0.94 ± 0.09%, 8.6 ± 0.6%, 0.17 ± 0.03%, and 0.35 ± 0.04%, respectively. In addition we have measured the 57Cu half-life and find it to be 196.3 ± 0.7 ms, which is in good agreement with the most recent measurement. B(GT) values have been extracted from the new results and are compared to shell model calculations.
author list (cited authors)
Semon, D. R., Allen, M. C., Dejbakhsh, H., Gagliardi, C. A., Hale, S. E., Jiang, J., ... Brown, B. A.