INDEPENDENT YIELDS OF ¹²⁴Sb AND ¹²⁶sb IN THERMAL NEUTRON INDUCED FISSION AND THEIR IMPLICATION ON THE EMPIRICAL Z_p FUNCTION

Abstract

The independent fission yields in thermal neutron induced fission of 235U have been measured to be (9.5 f 1.4) and (1.04 f 0.17). for 1Z4gSb and lZ6gSb, respectively. The total independent yields for all isomers of these nuclides are estimated to be (1.2 f 0.2).for 12"Sb and (3.7 f 0.6) for lZ6Sb using a Huizenga-Vandenbosch approach for estimating population of isomeric states.These data do not seem t o support a 50 proton shell effect on the Zp function, using the "unique" charge distribution curve of Wahl. A revised Wahl plot based on recent information on neutron emission from individual fission fragments is given and discussed in view of shell effects in fission. I t is shown that the effect of the Zp function of the 50 protoil shell is very small.