Structure of the proton emitter (117)La studied by proton and gamma-ray spectroscopy

Z. Liu, D. Seweryniak, P. J. Woods, C. N. Davids, M. P. Carpenter, T. Davinson, R. V. F. Janssens, R. D. Page, A. P. Robinson, J. Shergur, S. Sinha, X. D. Tang, F. R. Xu, S. Zhu

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Abstract / Description of output

Proton radioactivity from (117)La was re-investigated with much improved statistics and precision. Only the ground-state proton decay (E(p) = 813(3) keV, T(1/2) = 20.1(25) ms) was observed, no evidence for a previously reported isomeric proton decay was found. Prompt gamma rays in 117La were identified using the Recoil-Decay Tagging method. Overall the data indicate that the proton-emitting state is associated with a K(pi) = 3/2(+) configuration, in agreement with all the published proton-decay calculations and predictions for the ground-state configuration of (117)La calculated in the framework of either adiabatic or non-adiabatic particle models. However, this is not in agreement with the most recent state-of-the-art quasi-particle non-adiabatic model calculations which predict a K(pi) = 7/2(-) configuration. (C) 2011 Elsevier B.V. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)24-27
Number of pages4
JournalPhysics Letters B
Issue number1
Publication statusPublished - 3 Aug 2011

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