Identification of a dipole band above the Iπ=31/2- isomeric state in Pb 189
2015 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 92, no 5Article in journal (Refereed) PublishedText
A dipole band of six transitions built upon a firmly established Iπ=31/2- isomeric state has been identified in Pb189 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 Pb189 is based upon a π[s1/2-2h9/2i13/2]11- - ν[i13/2+-1]13/2+ configuration. However, the increased aligned-angular momentum in Pb189 may suggest evidence for a reduced repulsive proton/neutron-hole interaction compared to dipole bands in the heavier mass isotopes.
Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 92, no 5
IdentifiersURN: urn:nbn:se:kth:diva-181964DOI: 10.1103/PhysRevC.92.054312ISI: 000364900900005ScopusID: 2-s2.0-84948458000OAI: oai:DiVA.org:kth-181964DiVA: diva2:902846
QC 201602122016-02-122016-02-112016-02-12Bibliographically approved