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Título: | Competition between Allowed and First-Forbidden β Decay: The Case of Hg 208 → Tl 208 |
Autor: | Carroll, R.J.; Podolyák, Z.; Berry, T.; Grawe, H.; Alexander, T.; Andreyev, A.N.; Ansari, S.; García Borge, María José CSIC ORCID; Brunet, M.; Creswell, J.R.; Fraile, Luis M. ; Fahlander, C.; Fynbo, H.O.U.; Gamba, E.R.; Gelletly, W.; Gerst, R.B.; Górska, M.; Gredley, A.; Greenlees, P.T.; Harkness-Brennan, L.J.; Huyse, M.; Judge, S.M.; Judson, D.S.; Konki, J.; Kurcewicz, J.; Kuti, I.; Lalkovski, S.; Lazarus, I.H.; Lică, R.; Lund, M.; Madurga, Miguel CSIC; Marginean, N.; Marginean, R.; Marroquín, I. CSIC; Mihai, C.; Mihai, R.E.; Nácher, Enrique CSIC ORCID; Negret, A.; Nita, C.; Pascu, S.; Page, R.D.; Patel, Z.; Perea, Ángel CSIC ORCID; Phrompao, J.; Piersa, M.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regan, P.H.; Tengblad, Olof CSIC ORCID ; Vedia, V. | Fecha de publicación: | 2-nov-2020 | Editor: | American Physical Society | Citación: | Physical Review Letters 125: 192501 (2020) | Resumen: | The β decay of Hg208 into the one-proton hole, one neutron-particle Tl81208127 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. | Descripción: | 6 pags., 4 figs., 1 tab. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.125.192501 | URI: | http://hdl.handle.net/10261/228114 | DOI: | 10.1103/PhysRevLett.125.192501 | Identificadores: | doi: 10.1103/PhysRevLett.125.192501 issn: 1079-7114 |
Aparece en las colecciones: | (CFMAC-IEM) Artículos |
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