Abstract
The yrast superdeformed band in Pb has been populated using the YbMg,5n)Pb reaction at MeV. Decay rays were detected using the GAMMASPHERE array at the 88-Inch Cyclotron. Twelve -ray transitions have been observed directly linking three members of the Pb yrast superdeformed band to low-lying normal deformed levels. Anisotropy measurements indicate that these linking decays include 1, 1, and mixed multipolarities. The radiative widths deduced are very inhibited, typically Weisskopf units (W.u.) and W.u. Without recourse to a priori assumptions and keV have been unambiguously assigned to the lowest-lying observed superdeformed state (the state populated by the 170-keV intraband transition). The intensity of the observed primaries accounts for 21(2)% of the superdeformed band population.
- Received 26 November 1996
DOI:https://doi.org/10.1103/PhysRevC.55.2819
©1997 American Physical Society