Shape Isomerism at N = 40: Discovery of a Proton Intruder in 67Co
PHYSICAL REVIEW C(2008)
摘要
The nuclear structure of Co-67 has been investigated through Fe-67 beta decay. The Fe-67 isotopes were produced at the LISOL facility in proton-induced fission of U-238 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 Co-67 at an unexpected low energy of 492 keV. A Co-67 level scheme was deduced. Proposed spin and parities suggest a spherical (7/2(-)) Co-67 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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