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Wahid, S.G.; Tandel, S.K.; Suman, Saket; Srivastava, P.C.; Kumar, Anil; Chowdhury, P.; Kondev, F.G.; Janssens, R.V.F.; Carpenter, M.P.; Lauritsen, T.; Seweryniak, D.; Zhu, S.
Physics letters. B, 09/2022, Volume: 832Journal Article
Metastable states with $T_{1/2}$ = 8(2) ms in 205Bi and $T_{1/2}$ = 0.22(2) ms in 204Pb, with ≈ 8 MeV excitation energy and angular momentum ≥ 22 $\hbar$, have been established. These represent, by up to two orders of magnitude, the longest-lived nuclear states above an excitation energy of 7 MeV, ever identified in the nuclear chart. Additionally, the half-life of the 10.17 MeV state in 206Bi has been determined to be 0.027(2) ms, the next highest value in this highly excited regime. These observations indicate the emergence of an island of extreme nuclear isomerism arising from core-excited configurations at high excitation in the vicinity of the doubly closed-shell nucleus 208Pb. These results are expected to provide discriminating tests of the effective interactions used in current large-scale shell-model calculations.
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