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Shape Isomerism at N = 40: Discovery of a Proton Intruder in 67Co

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arxiv 0807.2595 v1 pith:XGRADUGY submitted 2008-07-16 nucl-ex

Shape Isomerism at N = 40: Discovery of a Proton Intruder in 67Co

D. Pauwels , O. Ivanov , J. Buscher , T.E. Cocolios , J. Gentens , M. Huyse , A. Korgul , Yu. Kudryavtsev
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R. Raabe M. Sawicka I. Stefanescu J. Van de Walle P. Van den Bergh P. Van Duppen W.B. Walters
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keywords statebeenintruderprotonapplicationbeta-decaycombinedcorrelation
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The nuclear structure of 67Co has been investigated through 67Fe beta-decay. The 67Fe isotopes were produced at the LISOL facility in proton-induced fission of 238U and selected using resonant laser ionization combined with mass separation. The application of a new correlation technique unambiguously revealed a 496(33) ms isomeric state in 67Co at an unexpected low energy of 492 keV. A 67Co level scheme has been deduced. Proposed spin and parities suggest a spherical (7/2-) 67Co ground state and a deformed first excited (1/2-) state at 492 keV, interpreted as a proton 1p-2h prolate intruder state.

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