Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a208Pb beam

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Abstract

Heavy neutron-rich nuclei were populated via the fragmentation of a $E/A=1$ GeV ${}^{208}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{82}$Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed $\ensuremath{\gamma}$ 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 ${}^{204,205}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{80}$Hg, ${}^{201,202,204,205}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{79}$Au, ${}^{197,203,204}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{78}$Pt, ${}^{195,199\ensuremath{-}203}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{77}$Ir, ${}^{193,197\ensuremath{-}199}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{76}$Os, ${}^{196}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{75}$Re, ${}^{190,191}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{74}$W, and ${}^{189}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}\phantom{\rule{-0.16em}{0ex}}{}_{73}$Ta. 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.

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