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Evolution of the N = 82 shell gap below 132Sn inferred from core excited states in 131In

Abstract : The γ -ray decay of an excited state in 131In, the one proton hole neighbor of the doubly magic 132Sn has been measured. A high-spin, core-excited isomer with T1/2 = 630(60) ns was identified following production by both relativistic fragmentation of a 136Xe beam and fission of a 238U beam. This state deexcites by a single γ -ray branch of 3782(2) keV from which direct evidence for the size of the N = 82 shell gap is inferred. The results are discussed in comparison to a shell-model calculation including configurations across the closed shells at N = 82 and Z = 50.
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http://hal.in2p3.fr/in2p3-00365987
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, March 5, 2009 - 12:48:39 PM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM

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M. Górska, L. Cáceres, H. Grawe, M. Pfützner, A. Jungclaus, et al.. Evolution of the N = 82 shell gap below 132Sn inferred from core excited states in 131In. Physics Letters B, Elsevier, 2009, 672, pp.313-316. ⟨10.1016/j.physletb.2009.01.027⟩. ⟨in2p3-00365987⟩

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