Phys.Lett. B 832, 137262 (2022)

S.G.Wahid, S.K.Tandel, S.Suman, P.C.Srivastava, A.Kumar, P.Chowdhury, F.G.Kondev, R.V.F.Janssens, M.P.Carpenter, T.Lauritsen, D.Seweryniak, S.Zhu

Emergence of an island of extreme nuclear isomerism at high excitation near ²⁰⁸Pb

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1430 MeV; ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1450 MeV; measured Eγ, Iγ, γγ-coin, delayed γ spectra, T_1/2 of isomers by γγ(t) using pulsed beam from ATLAS-ANL facility, and Gammasphere array for γ detection. ²⁰⁴Pb, ^205,206Bi; deduced levels, isomers, J, π, configurations, nuclear isomerism from core-excited configurations in the vicinity of ²⁰⁸Pb. Comparison with shell-model predictions.

COMPILATION ⁹³Nb, ⁹³Mo, ¹⁴⁰Nd, ¹⁴⁴Pm, ¹⁴⁸Tb, ^212,213Fr, ²⁰⁴Pb, ^205,206Bi; compiled T_1/2 of isomers of >1 micro-sec half-life above 7-MeV excitations across the nuclear chart. ^{202,203,204,205}Tl, ^202,203,204Pb, ²⁰⁶Bi, ²¹³At, ^210,211,212Rn, ^209,211,212Fr; compiled B(E3) for isomer decays.

doi: 10.1016/j.physletb.2022.137262