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.
- 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, M.
- Marginean, N.
- Marginean, R.
- Marroquin, I.
- Mihai, C.
- Mihai, R. E.
- Nácher, E.
- Negret, A.
- Nita, C.
- Pascu, S.
- Page, R. D.
- Patel, Z.
- Perea, A.
- Phrompao, J.
- Piersa, M.
- Pucknell, V.
- Rahkila, P.
- Rapisarda, E.
- Regan, P. H.
- Rotaru, F.
- Rudigier, M.
- Shand, C. M.
- Shearman, R.
- Stegemann, S.
- Stora, T.
- Sotty, Ch.
- Tengblad, O.
- Van Duppen, P.
- Vedia, V.
- Wadsworth, R.
- Walker, P. M.
- Warr, N.
- Wearing, F.
- De Witte, H.
DOIAbstract
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 o...
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