The fine-structure in the fission yield curve for 233U

Abstract

The yields of ¹⁸⁸Ba, ¹³⁸Sr, ⁹⁰Sr, ⁸⁹Y and of five zirconium isotopes formed in the fission of ²³³U have been measured. There is a fine-structure in the yield as a function of mass number. The independent yield of ¹³⁶Cs has been measured, while that of ⁸⁶Rb has been estimated, thus completing important parts of the yield curve. The boundary between the region where a light fragment emits one neutron and the region where it emits two is established from the curve. It is concluded that the structure is determined by events at the instant of fission.