- Conference date: 6-9 Nov 1996
- Location: Denton, Texas (USA)
Intruder state excitation energies in odd-mass nuclei just outside a closed proton shell plotted versus neutron number generally exhibit parabola-shaped curves with minima near neutron mid-shells. The Bi isotopes, however, do not seem to follow this trend. Recent experiments performed at Argonne National Laboratory have identified the previously unobserved ground state to ground state α transition. Its energy when combined with those of two earlier known transitions, namely and establishes the excitation energies of the and to be 620(20) keV and 110(20) keV, respectively. This value for is 80 keV lower than the excitation energy of the same intruder level in Implications of this result with respect to intruder-state systematics are discussed.
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