Published in
American Physical Society, Physical Review Letters, 13(113)
DOI: 10.1103/physrevlett.113.132502
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Yrast 6+Seniority Isomers of136,138Sn
,
S. Nishimura,
K. Sieja,
P. Doornenbal,
G. Lorusso,
P.-A. Söderström,
T. Sumikama,
Z. Y. Xu ,
H. Baba ,
F. Browne,
N. Fukuda,
N. Inabe
and other authors.
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Abstract
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.