Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a 208Pb beam

S.J. Steer, Zs. Podolyák, S. Pietri, M. Gorska, H. Grawe, K.H. Maier, P.H. Regan, D. Rudolph, A.B. Garnsworthy, R. Hoischen, J. Gerl, H.J. Wollersheim, F. Becker, P. Bednarczyk, L. Caceres, P. Doornenbal, H. Geissel, J. Grebosz, A. Kelic, I. KojouharovN. Kurz, F. Montes, W. Prokopowicz, T. Saito, H. Schaffner, S. Tashenov, A. Heinz, M. Pfutzner, T. Kurtukian-Nieto, G. Benzoni, A. Jungclaus, D.L. Balabanski, M. Bowry, C. Brandau, A. Brown, Alison Bruce, W.N. Catford, I.J. Cullen, Zs. Dombradi, M.E. Estevez, W. Gelletly, G. Ilie, J. Jolie, G.A. Jones, M. Kmiecik, F.G. Kondev, R. Krücken, S. Lalkovski, Z. Liu, A. Maj

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Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV 208 82Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed γ rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. The newly discovered isomers are in 204,205 80Hg, 201,202,204,205 79Au, 197,203,204 78Pt, 195,199−203 77Ir, 193,197−199 76Os, 196 75Re, 190,191 74W, and 189 73Ta. Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.
Original languageEnglish
JournalPhysical Review C
Issue number4
Publication statusPublished - 14 Oct 2011


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