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Identification of a dipole band above the Iπ=31/2- isomeric state in Pb 189
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2015 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 92, no 5Article in journal (Refereed) PublishedText
Abstract [en]

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
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-181964DOI: 10.1103/PhysRevC.92.054312ISI: 000364900900005ScopusID: 2-s2.0-84948458000OAI: oai:DiVA.org:kth-181964DiVA: diva2:902846
Note

QC 20160212

Available from: 2016-02-12 Created: 2016-02-11 Last updated: 2016-02-12Bibliographically approved

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