Identification of a dipole band above the Iπ = 31/2- isomeric state in 189Pb
Hodge, D., Cullen, D. M., Taylor, M. J., Procter, M. G., Nieminen, P., Grahn, T., Greenlees, P., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lopez-Martens, A., Partanen, J., Peura, P., Rahkila, P., . . . Uusitalo, J. (2015). Identification of a dipole band above the Iπ = 31/2- isomeric state in 189Pb. Physical Review C, 92(5), Article 054312. https://doi.org/10.1103/PhysRevC.92.054312
Published in
Physical Review CDate
2015Copyright
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
A dipole band of six transitions built upon a firmly established I π = 31/2− isomeric state has been identified
in 189Pb using recoil-isomer tagging. This is the lightest odd-mass Pb nucleus in which a dipole band is known.
The dipole nature of the new transitions has been confirmed through angular-intensity arguments. The evolution
of the excitation energy and the aligned-angular momentum of the states in the new dipole band are compared
with those of dipole bands in heavier, odd-mass lead isotopes. This comparison suggests that the new band in
189Pb is based upon a π[s−2
1/2h9/2i13/2]11− ⊗ ν[i
−1
13/2+ ]13/2+ configuration. However, the increased aligned-angular
momentum in 189Pb may suggest evidence for a reduced repulsive proton/neutron-hole interaction compared to
dipole bands in the heavier mass isotopes.
Publisher
American Physical SocietyISSN Search the Publication Forum
0556-2813Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/25351696