Abstract
Measurements of charge distributions of fragments in the spontaneous fission of have been performed using a unique detector setup consisting of a typical grid-ionization chamber coupled with a charged particle telescope. We find that the fragment mass dependency of the kinetic-energy-averaged width of the charge distribution shows a systematically decreasing trend with obvious fluctuations. The variation of the widths of the charge distribution with kinetic energy shows a pan-like shape. This is due to the large number of neutrons emitted at the high excitation energies and cold fragmentation at the low excitation energies. Deviation of the kinetic-energy-averaged most probable charge from the unchanged charge distribution (UCD), , as a function of the mass number of primary fragments, , changes from negative for mass asymmetric fission to positive near the symmetric fissions. Concerning the kinetic energy dependence of given primary mass number , obvious increasing tendencies of with increasing kinetic energy are observed.
1 More- Received 10 July 2017
DOI:https://doi.org/10.1103/PhysRevC.96.034611
©2017 American Physical Society