Abstract
Using a decay-in-flight technique, a search for 1-100 nsec decay has been conducted in a variety of rare earth nuclei made in energetic heavy ion reaction. Assuming spherical rigid rotation and particle formation factors similar to those of the ground state, this lifetime range corresponds to nuclear spins of where very high spin isomerism has been predicted theoretically. No evidence for decay was observed. decay cross section limits are set for 14 systems in which high spin isomers () are known with lifetimes in the range studied. Comparison to theoretical total cross sections allows -branching ratio estimates to be made.
RADIOACTIVITY Short-lived isomers of Gd, Tb, Dy, Ho, Er; measured limits on for MeV and nsec; deduced limits on -decay branching ratios.
- Received 5 February 1980
DOI:https://doi.org/10.1103/PhysRevC.22.755
©1980 American Physical Society