Competition between Allowed and First-Forbidden β Decay: The Case of <SUP>208</SUP>Hg → <SUP>2</SUP><SUP>0</SUP><SUP>8</SUP>Tl

Carroll, RJ, Podolyak, Zs, Berry, T, Grawe, H, Alexander, T, Andreyev, AN, Ansari, S, Borge, MJG, Brunet, M, Creswell, JR
et al (show 54 more authors) (2020) Competition between Allowed and First-Forbidden β Decay: The Case of <SUP>208</SUP>Hg → <SUP>2</SUP><SUP>0</SUP><SUP>8</SUP>Tl. PHYSICAL REVIEW LETTERS, 125 (19). 192501-.

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The β decay of ^{208}Hg into the one-proton hole, one neutron-particle _{81}^{208}Tl_{127} 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 Q_{β} 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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 27 Nov 2020 11:09
Last Modified: 21 Jun 2024 00:00
DOI: 10.1103/PhysRevLett.125.192501
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