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New sub-mus isomers in 125,127,129Sn and isomer systematics of 124-130Sn

Abstract : Newsub-μs isomers have been observed in the neutron-rich Sn isotopes. 125,127,129Sn nuclei have been produced in a relativistic fission reaction of 238U on a 9Be target at 750 A·MeV and by the fragmentation of 136Xe at 600 A·MeV populating high-spin yrast states. In addition to the already known μs isomers, three new ones with sub-μs half-lives have been observed. These yrast isomers are the high-spin members of the ν(d−1 3/2h−2 11/2) and νh−n 11/2, seniority v = 3 multiplets leading to isomeric (23/2+) and (27/2−) states, respectively. Added to the already known 19/2+μs isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h11/2 orbital at N = 82. The results are discussed in the framework of state-of-the-art shell-model calculations using realistic interactions.
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http://hal.in2p3.fr/in2p3-00289586
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Submitted on : Monday, June 23, 2008 - 8:18:17 AM
Last modification on : Tuesday, November 24, 2020 - 2:10:04 PM

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Radomira Lozeva, G.S. Simpson, H. Grawe, G. Neyens, L.A. Atanasova, et al.. New sub-mus isomers in 125,127,129Sn and isomer systematics of 124-130Sn. Physical Review C, American Physical Society, 2008, 77, pp.064313. ⟨10.1103/PhysRevC.77.064313⟩. ⟨in2p3-00289586⟩

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