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Yrast 6 + seniority isomers of 136,138 Sn

AuthorsSimpson, G. S.; Gey, G.; Jungclaus, Andrea ; Taprogge, J. ; Montaner-Pizá, A. ; Nishimura, S.; Sieja, K.; Steiger, K.; Wendt, A.
Issue Date26-Sep-2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 113: 132502 (2014)
Abstract© 2014 American Physical Society. Delayed γ-ray cascades, originating from the decay of (6+) isomeric states, in the very neutron-rich, semimagic isotopes 136,138Sn have been observed following the projectile fission of a 238U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f7/2 neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6+→4+) rate of 136Sn, which deviates from a simple seniority scheme. Empirically reducing the νf7/22 orbit matrix elements produces a 41+ state with almost equal seniority 2 and 4 components, correctly reproducing the experimental B(E2;6+→4+) rate of 136Sn. These data provide a key benchmark for shell-model interactions far from stability.
DescriptionG.S.Simpson et al. ; 6 pags. ; 5 figs. ; tab. ; PACS numbers: 21.10.Ky, 21.60.Cs, 27.60.+j
Identifiersdoi: 10.1103/PhysRevLett.113.132502
issn: 1079-7114
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