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Yrast 6 + seniority isomers of 136,138 Sn

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Title
Yrast 6 + seniority isomers of 136,138 Sn
Author(s)
Simpson G.S.; Gey G.; Jungclaus A.; Taprogge J.; Nishimura S.; Sieja K.; Doornenbal P.; Lorusso G.; Soderstrom 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.; Bonig S.; Daugas J.-M.; Drouet F.; Gernhauser R.; Ilieva S.; Kroll T.; Montaner-Piza A.; Moschner K.; Mucher D.; Naidja H.; Nishibata H.; Nowacki F.; Odahara A.; Orlandi R.; Steiger K.; Wendt A.
Publication Date
2014-09
Journal
PHYSICAL REVIEW LETTERS, v.113, no.3, pp.132502-1 - 132502-6
Publisher
AMER PHYSICAL SOC
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 þ 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.
URI
http://pr.ibs.re.kr/handle/8788114/2944
DOI
10.1103/PhysRevLett.113.132502
ISSN
0031-9007
Appears in Collections:
HiddenCommunity > Journal Papers
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