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

M. Górska, L. Cáceres, H. Grawe, M. Pfützner, A. Jungclaus, S. Pietri, E. Werner-Malento, Z. Podolyák, P. H. Regan, D. Rudolph, P. Detistov, S. Lalkovski, V. Modamio, J. Walker, T. Beck, P. Bednarczyk, P. Doornenbal, H. Geissel, J. Gerl, J. GrȩboszR. 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, M. 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 Dombrádi, P. Reiter, D. Sohler

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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.

Original languageEnglish
Pages (from-to)313-316
Number of pages4
JournalPhysics Letters B
Volume672
Issue number4-5
DOIs
StatePublished - Mar 2 2009
Externally publishedYes

Funding

We would like to thank Prof. B.A. Brown from MSU for valuable discussions. This work is supported by the EU Access to Large Scale Facilities Programme (EURONS, EU contract 506065), the Polish Ministry of Science and Higher Education (1-P03B-030-30 and 620/E-77/SPB/GSI/P-03/DWM105/2004-2007), the Spanish Ministerio de Educacion y Ciencia (FPA2005-00696, FPA2005-00732 and FPA2007-66069), EPSRC/STFC (UK), The Swedish Research Council, The Bulgarian Science Fund VUF06/05, The US Dept. of Energy (DE-FG02-91ER-40609 and DE-AC02-06CH11357), The German Federal Ministry of Education and Research (06KY205I), The Hungarian Science Foundation (OTKA K-68801) and the Italian INFN.

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