Abstract
A search for neutron emission from spontaneous fission of in the time range - s has been made by a method based upon the solid angle aberration. No positive evidence for neutron emission in this time range has been found, but an upper limit for the relative intensity of a single long-lived component as a function of its mean lifetime has been set. It is concluded that very few if any neutrons are emitted with mean lifetimes longer than s, but possibly there is a sizable fraction with a mean lifetime in the s range. A competition between neutron and -ray emission can therefore possibly take place in the time region - s after fission, as can be expected at excitation energies near the yrast levels.
RADIOACTIVITY (sf); measured upper limit of ( s).
- Received 12 July 1977
DOI:https://doi.org/10.1103/PhysRevC.16.1902
©1977 American Physical Society