Evolution of the N=82 Shell Gap below 132Sn Inferred from Core Excited States in 131In

M. Gorska, L. Caceres, H. Grawe, M. Pfuetzner, A. Jungclaus, S. Pietri, E. Werner-Malento, Z. Podolyak, P. H. Regan, Dirk Rudolph, R. Detistov, S. Lalkovski, V. Modamio, J. Walker, T. Beck, P. Bednarczyk, P. Doornenbal, H. Geissel, J. Gerl, J. GreboszRobert Hoischen, I. Kojouharov, N. Kurz, W. Prokopowicz, H. Schaffner, H. Weick, H. -J. Wollersheim, K. Andgren, J. Benlliure, G. Benzoni, A. M. Bruce, E. Casarejos, B. Cederwall, F. C. L. Crespi, B. Hadinia, Margareta Hellström, G. Ilie, A. Khaplanov, M. Kmiecik, R. Kumar, A. Maj, S. Mandal, F. Montes, S. Myalski, G. S. Simpson, S. J. Steer, S. Tashenov, O. Wieland, Zs. Dombradi, R. Reiter, D. Sohler

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Abstract

The gamma-ray decay of ail excited state in In-131, the one proton hole neighbor of the doubly magic (132)sn has been measured. A high-spin, core-excited isomer with T-1/2 = 630(60) us was identified following production by both relativistic fragmentation of a Xe-136 beam and fission Of a U-238 beam. This state deexcites by a single gamma-ray branch of 3782(2) keV from which direct evidence for the size of the N = 82 shell gal) 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. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)313-316
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume672
Issue number4-5
DOIs
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Subatomic Physics

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