TY  - JOUR
AU  - Simpson, G. S. et al
AU  - Montaner-Piza, A.
PY  - 2014
DA  - 2014//
TI  - Yrast 6(+) Seniority Isomers of Sn-136,Sn-138
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 132502
EP  - 6pp
VL  - 113
IS  - 13
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - https://doi.org/10.1103/PhysRevLett.113.132502
DO  - 10.1103/PhysRevLett.113.132502
LA  - English
N1  - WOS:000342666500001
ID  - Simpson+Montaner-Piza2014
ER  -