Competition between Allowed and First-Forbidden β Decay : The Case of Hg208→Tl208
Carroll, R. J.; Podolyák, Zs.; Berry, T.; Grawe, H.; Alexander, T.; Andreyev, A. N.; Ansari, S.; Borge, M. J. G.; Brunet, M.; Creswell, J. R.; Fraile, L. M.; Fahlander, C.; Fynbo, H. O. U. et al. (2020). Competition between Allowed and First-Forbidden β Decay : The Case of Hg208→Tl208. Physical Review Letters, 125 (19), 192501. DOI: 10.1103/physrevlett.125.192501
Published inPhysical Review Letters
Kuti, I. |
Lică, R. |
Lund, M. |
Nita, C. |
Warr, N. |
© Authors, 2020
The β decay of 208Hg into the one-proton hole, one neutron-particle 20881Tl127 nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N>126, Z<82 quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the Qβ window, only three negative parity states are populated directly in the β decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden β decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing 0+→0−β decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.
PublisherAmerican Physical Society (APS)
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