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Isomers from intrinsic excitations in Tl-200 and Pb-201,Pb-202

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摘要

A six-quasiparticle isomer with T-1/2 = 57(2) ns has been established in the doubly-odd isotope Tl-200 and its level scheme is significantly extended. Half-lives of previously reported isomers in Tl-200 and Pb-201,Pb-202 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 I-pi = 5(+) and 7(-) states in Tl-200, 52(2) ns for the 41/2(+) level in Pb-201, and 93(4) ns for the 16(+) state in Pb-202. 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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