Abstract
Product recoils from the reaction +255 MeV → were analyzed using the Argonne Fragment Mass Analyzer and transported to a collector foil behind the focal plane, where decay of μs isomers could be studied under low background conditions. The recoils were dispersed in A/q as they traversed the position-sensitive focal-plane detector, and recoil–γ-ray coincidences could thus be used to assign masses for specific γ-ray cascades. By use of these methods, yrast isomers with half-lives of 2.6(7) μs and 20(1) μs have been firmly assigned to the exotic N=81 nucleus , and the main features of the isomeric decays have been established. The yrast level structure of and lighter N=81 isotones are compared.
- Received 4 December 1992
DOI:https://doi.org/10.1103/PhysRevC.47.1929
©1993 American Physical Society