Isomers from intrinsic excitations in Tl200 and Pb201,202
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Abstract
A six-quasiparticle isomer with $T{}_{1/2}$ = 57(2) ns has been established in the doubly-odd isotope $^{200}\mathrm{Tl}$ and its level scheme is significantly extended. Half-lives of previously reported isomers in $^{200}\mathrm{Tl}$ and $^{201,202}\mathrm{Pb}$ have been determined and revised values are reported in a few cases, with $T{}_{1/2}$ = 397(17) ns and 7.0(5) ns for the ${\mathit{I}}^{\ensuremath{\pi}}={5}^{+}$ and ${7}^{\ensuremath{-}}$ states in $^{200}\mathrm{Tl}$, 52(2) ns for the $41/{2}^{+}$ level in $^{201}\mathrm{Pb}$, and 93(4) ns for the ${16}^{+}$ state in $^{202}\mathrm{Pb}$. Configurations for the isomers have been assigned and these predominantly involve intrinsic excitations of neutrons from the ${i}_{13/2}$ subshell. The inferred transition rates for the decay of these isomers compare well with single-particle estimates attesting to their intrinsic character.
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