Competition between Allowed and First-Forbidden β Decay: The Case of Hg208→Tl208

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RESEARCH PRODUCT

Competition between Allowed and First-Forbidden β Decay: The Case of Hg208→Tl208

V. F. E. Pucknell R.-b. Gerst M. Lund I.h. Lazarus P. H. Regan P. H. Regan N. Marginean R. Shearman R. Shearman J. Phrompao M. Piersa V. Vedia Miguel Madurga Miguel Madurga R. Lica Marc Huyse F. Wearing J. Kurcewicz J. R. Creswell María José García Borge R. Mărginean L. M. Fraile W. Gelletly S. Pascu István Kuti S. Stegemann T. Alexander A. Negret C. R. Nita Paul Greenlees Paul Greenlees C. Mihai Raymond J. Carroll Andrei Andreyev Andrei Andreyev F. Rotaru ÁNgel Perea R. D. Page P. M. Walker M. Brunet Zs. Podolyák I. Marroquin R. Wadsworth D. S. Judson A. Gredley P. Van Duppen E. Rapisarda M. Rudigier H. De Witte Zena Patel T. Berry Enrique Nácher H. Grawe M. Górska N. Warr L. J. Harkness-brennan S. Lalkovski S. M. Judge P. Rahkila P. Rahkila Joonas Konki Joonas Konki S. Ansari Thierry Stora C. M. Shand R. E. Mihai E. R. Gamba Claes Fahlander H. O. U. Fynbo Olof Tengblad C. Sotty

subject

Physics Nuclear Theory General Physics and Astronomy Parity (physics)01 natural sciences 7. Clean energy Neutron capture medicine.anatomical_structure Nucleosynthesis Excited state 0103 physical sciences medicine Neutron Atomic physics Nuclear Experiment 010306 general physics Nucleus Fermi Gamma-ray Space Telescope

description

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.

year	journal	country	edition	language
2020-11-02	Physical Review Letters

https://doi.org/10.1103/physrevlett.125.192501