Shape Isomerism at N = 40: Discovery of a Proton Intruder in 67Co
  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. 
D. Pauwels, O. Ivanov, J. Buscher, T.E. Cocolios, J. Gentens, M.   Huyse, A. Korgul, Yu. Kudryavtsev, R. Raabe, M. Sawicka, ...