Phys.Rev. C 103, 044314 (2021)

H.B.Zhou, Z.G.Gan, N.Wang, H.B.Yang, L.Ma, M.H.Huang, C.L.Yang, M.M.Zhang, Y.L.Tian, Y.S.Wang, Z.Y.Li, C.X.Yuan, S.Huang, X.J.Sun, H.Y.Peng, L.Ou, X.H.Zhou

Lifetime measurement for the isomeric state in ²¹³Th

NUCLEAR REACTIONS ¹⁷⁶Hf(⁴⁰Ar, xn)²¹³Th/²¹⁴Th/²¹⁵Th, E=183, 190 MeV beam from Sector-Focusing Cyclotron of HIRFL-Lanzhou facility, followed by the separation of evaporation residues (ERs) by the SHANS separator and implanted in three position-sensitive silicon strip detectors (PSSDs); measured position, time, and energy of the ERs, Eα, Iα, Eγ, Iγ, (ER)α-, (ER)γ- and (ER)αγ-correlated events. Enriched target. ^213,214,215Th; deduced levels, J, π, isomers, half-lives of the isomers in ^213,214,215Th. Comparison with previous experimental results for isomer half-lives. Systematics of 13/2+ isomers in N=123 isotones ²⁰⁷Po, ²⁰⁹Rn, ²¹¹Ra and ²¹³Th.

RADIOACTIVITY ^{209,210,211,213}Ra, ^212,213,215Ac, ^{211,212,213,214,215,216}Th(α)[from ^{176,177,178,179,180}Hf(⁴⁰Ar, xnyp), E=183, 190 MeV, enriched ¹⁷⁶Hf with small abundance of other Hf isotopes]; measured Eα, Iα, αγ-correlations.

doi: 10.1103/PhysRevC.103.044314