Title: Yrast 6(+) Seniority Isomers of Sn-136,Sn-138
Authors: Simpson, G. S ×
Gey, G
Jungclaus, A
Taprogge, J
Nishimura, S
Sieja, K
Doornenbal, P
Lorusso, G
Soederstroem, P. -A
Sumikama, T
Xu, Z. Y
Baba, H
Browne, F
Fukuda, N
Inabe, N
Isobe, T
Jung, H. S
Kameda, D
Kim, G. D
Kim, Y. -K
Kojouharov, I
Kubo, T
Kurz, N
Kwon, Y. K
Li, Z
Sakurai, H
Schaffner, H
Shimizu, Y
Suzuki, H
Takeda, H
Vajta, Z
Watanabe, H
Wu, J
Yagi, A
Yoshinaga, K
Boenig, S
Daugas, J. -M
Drouet, F
Gernhaeuser, R
Ilieva, S
Kroell, T
Montaner-Piza, A
Moschner, K
Muecher, D
Naidja, H
Nishibata, H
Nowacki, F
Odahara, A
Orlandi, Riccardo
Steiger, K
Wendt, A #
Issue Date: 2014
Series Title: PHYSICAL REVIEW LETTERS vol:113 issue:13 pages:1-6
Abstract: Delayed γ-ray cascades, originating from the decay of ð6þÞ 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 BðE2; 6þ → 4þÞ rate of 136Sn, which deviates from a simple seniority scheme. Empirically reducing
the νf2
7=2 orbit matrix elements produces a 4
1 state with almost equal seniority 2 and 4 components,
correctly reproducing the experimental BðE2; 6þ → 4þÞ rate of 136Sn. These data provide a key benchmark
for shell-model interactions far from stability.
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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