%0 Journal Article
%T Yrast 6(+) Seniority Isomers of Sn-136,Sn-138
%A Simpson, G. S. et al
%A Montaner-Piza, A.
%J Physical Review Letters
%D 2014
%V 113
%N 13
%I Amer Physical Soc
%@ 0031-9007
%G English
%F Simpson+Montaner-Piza2014
%O WOS:000342666500001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1957), last updated on Thu, 30 Oct 2014 10:34:44 +0000
%X Delayed gamma-ray cascades, originating from the decay of (6(+)) isomeric states, in the very neutron-rich, semimagic isotopes Sn-136,Sn-138 have been observed following the projectile fission of a U-238 beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) 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 Sn-136, which deviates from a simple seniority scheme. Empirically reducing the nu f(7/2)(2) orbit matrix elements produces a 4(1)(+) state with almost equal seniority 2 and 4 components, correctly reproducing the experimental B(E2; 6(+) -> 4(+)) rate of Sn-136. These data provide a key benchmark for shell-model interactions far from stability.
%R 10.1103/PhysRevLett.113.132502
%U https://doi.org/10.1103/PhysRevLett.113.132502
%P 132502-6pp