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

S. J. Steer, Zs Podolyák, S. Pietri, M. Górska, 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. Cáceres, P. Doornenbal, H. Geissel, J. Grȩbosz, A. Kelic, I. KojouharovN. Kurz, F. Montes, W. Prokopwicz, T. Saito, H. Schaffner, S. Tashenov, A. Heinz, M. Pfützner, T. Kurtukian-Nieto, G. Benzoni, A. Jungclaus, D. L. Balabanski, M. Bowry, C. Brandau, A. Brown, A. M. Bruce, W. N. Catford, I. J. Cullen, Zs Dombrádi, 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, S. Myalski, S. Schwertel, T. Shizuma, P. M. Walker, E. Werner-Malento, O. Wieland

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Abstract

Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV 20882Pb 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, 197,203,20478Pt, 195 ,199-20377Ir, 193,197 -19976Os, 19675Re, 190,191 74W, and 18973Ta. 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
Article number044313
JournalPhysical Review C - Nuclear Physics
Volume84
Issue number4
DOIs
Publication statusPublished - okt. 14 2011

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Steer, S. J., Podolyák, Z., Pietri, S., Górska, M., Grawe, H., Maier, K. H., Regan, P. H., Rudolph, D., Garnsworthy, A. B., Hoischen, R., Gerl, J., Wollersheim, H. J., Becker, F., Bednarczyk, P., Cáceres, L., Doornenbal, P., Geissel, H., Grȩbosz, J., Kelic, A., ... Wieland, O. (2011). Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a 208Pb beam. Physical Review C - Nuclear Physics, 84(4), [044313]. https://doi.org/10.1103/PhysRevC.84.044313