Energies and Yields of Prompt Gamma Rays from Fragments in Slow-Neutron Induced Fission of 235U

摘要

Measurements were made on the gamma radiation emitted fromn235 fission fragments in slow-neutron induced fission of U. The freg- ments were detected with solid state detectors of the surface barrier type and the gamma radiation with a Nal (TL) scintillator. Mass selection was used so that the gamma radiation could be measured as a function of fragment mass. Time discrimination between the fission gammas and the prompt neutrons released in the fission process was employed to reduce the background. The gamma radiation emitted during different time intervals after the fission event was studied with the help of a collimator, the position of which was changed along the path of the fission fragments.