A dipole band above the Iπ= 31/2− isomeric state in 189Pb
School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
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Published online: 5 September 2016
This contribution focuses on the new observation of a dipole band built upon an Iπ=31/2− isomeric state in 189Pb, identified using recoil-isomer tagging at the University of Jyväskylä, Finland. This is the lightest odd-mass Pb isotope in which a dipole band is known. By comparison with the heavier-mass dipole bands, the dipole band in 189Pb was deduced to be based upon a configuration. However, in the 189Pb dipole band, the initial aligned angular momentum was larger than that exhibited by the dipole bands in the heavier-mass isotopes. This may be evidence for a reduced repulsive proton/neutron-hole interaction in 189Pb.
© The Authors, published by EDP Sciences, 2016
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