Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a Pb beam
Steer, S. J.*; Podolyk, Z.*; Pietri, S.*; Grska, M.*; Grawe, H.*; Maier, K.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Gerl, J.*; Wollersheim, H. J.*; Becker, F.*; Bednarczyk, P.*; Cceres, L.*; Doornenbal, P.*; Geissel, H.*; Grbosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; Saito, Takehiko*; Schaffner, H.*; Tashenov, S.*; Heinz, S.*; Pftzner, M.*; Kurtukian-Nieto, T.*; Benzoni, G.*; Jungclaus, A.*; Balabanski, D. L.*; Bowry, M.*; Brandau, C.*; Brown, B. A.*; Bruce, A. M.*; Catford, W. N.*; Cullen, I. J.*; Dombrdi, Zs.*; Estevez, M. E.*; Gelletly, W.*; Ilie, G.*; Jolie, J.*; Jones, G. A.*; Kmiecik, M.*; Kondev, F. G.*; Krcken, R.*; Lalkovski, S.*; Liu, Z.*; Maj, A.*; Myalski, S.*; Schwertel, S.*; Shizuma, Toshiyuki; Walker, P. M.*; Werner-Malento, E.*; Wieland, O.*
Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed 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. 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.