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.

Competition between Allowed and First-Forbidden β Decay : The Case of 208Hg→208TI / R. . Carroll, Z. Podolyák, T. Berry, H. Grawe, T. Alexander, A. . Andreyev, S. Ansari, M. . . Borge, M. Brunet, J. . Creswell, L. . Fraile, C. Fahlander, H. . . Fynbo, E. Gamba, W. Gelletly, R.-. Gerst, M. Górska, A. Gredley, P. . Greenlees, L. . Harkness-Brennan, M. Huyse, S. . Judge, D. . Judson, J. Konki, J. Kurcewicz, I. Kuti, S. Lalkovski, I. . Lazarus, R. Lică, M. Lund, M. Madurga, N. Marginean, R. Marginean, I. Marroquin, C. Mihai, R. . Mihai, E. Nácher, A. Negret, C. Nita, S. Pascu, R. . Page, Z. Patel, A. Perea, J. Phrompao, M. Piersa, V. Pucknell, P. Rahkila, E. Rapisarda, P. . Regan, F. Rotaru, M. Rudigier, C. . Shand, R. Shearman, S. Stegemann, T. Stora, C. Sotty, O. Tengblad, P. Van Duppen, V. Vedia, R. Wadsworth, P. . Walker, N. Warr, F. Wearing, H. De Witte. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 125:19(2020), pp. 192501.1-192501.6. [10.1103/PhysRevLett.125.192501]

Competition between Allowed and First-Forbidden β Decay : The Case of 208Hg→208TI

E. Gamba;
2020

Abstract

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.
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/889125
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