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

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

2008-07-16

arxiv.org/abs/0807.2595v1

Phys.Rev.C78:041307,2008

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 5 figures, preprint submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevC.78.041307

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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