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, R. Raabe, M. Sawicka, I. Stefanescu, J., Van de Walle, P. Van den Bergh, P. Van Duppen, and W.B. Walters
TL;DR
This study uncovers a low-energy proton intruder state in 67Co, revealing shape isomerism and providing new insights into nuclear structure near N=40 through innovative decay and correlation techniques.
Contribution
The paper reports the discovery of a proton 1p-2h intruder state in 67Co, using a novel correlation method to elucidate its level scheme and shape coexistence.
Findings
Identification of a 496 ms isomeric state at 492 keV in 67Co
Proposed spherical ground state with a deformed intruder state
Evidence of shape isomerism at N=40 in cobalt isotopes
Abstract
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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