Decay spectroscopy of Sm-160: The lightest four-quasiparticle K isomer
- Patel, Z.
- Podolyak, Zs
- Walker, P. M.
- Regan, P. H.
- Soederstroem, P-A.
- Watanabe, H.
- Ideguchi, E.
- Simpson, G. S.
- Nishimura, S.
- Browne, F.
- Doornenbal, R.
- Lorusso, G.
- Rice, S.
- Sinclair, L.
- Sumikama, T.
- Wu, J.
- Xu, Z. Y.
- Aoi, N.
- Baba, H.
- Garrote, F. L. Bello
- Benzoni, G.
- Daido, R.
- Dombradi, Zs.
- Fang, Y.
- Fukuda, N.
- Gey, G.
- Go, S.
- Gottardo, A.
- Inabe, N.
- Isobe, T.
- Kameda, D.
- Kobayashi, K.
- Kobayashi, M.
- Komatsubara, T.
- Kojouharov, I.
- Kubo, T.
- Kurz, N.
- Kuti, I.
- Li, Z.
- Liu, H. L.
- Matsushita, M.
- Michimasa, S.
- Moony, C.B.
DOIAbstract
The decay of a new four-quasiparticle isomeric state in Sm-160 has been observed using gamma-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2 pi circle times 2 nu pi 5/2(-)[532], pi 5/2(+)[413], nu 5/2(-)[523], nu 7/2(+)[633] configuration. The half-life of this (11(+)) state is measured to be 1.8(4) mu s. The (11(+)) isomer decays into a rotational band structure, based on a (6(-)) nu 5/2(-)[523] circle times nu 7/2(+)[633] bandhead, consistent with the g(K)-g(R) values. This decays to a (5(-)) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around Sm-160. They reveal a signifi...
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