Search for the Fission Modes in Np Nucleus Populated by Th

• Published in: Physics of atomic nuclei Vol. 85; no. 6; pp. 770 - 775
• Main Authors: Banerjee, Tathagata, Kozulin, E. M., Knyazheva, G. N., Itkis, I. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2022; Springer; Springer Nature B.V
• Subjects: Analysis; Deuterons; Drops (liquids); Energy; Excitation; Force and energy; Fragments; Kinetic energy; Laboratories; Modal analysis; Nuclear fission; Nuclear reactions; NUCLEI/Experiment; Particle and Nuclear Physics; Physics; Physics and Astronomy; Two dimensional analysis
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778823010076

The mass-total kinetic energy (M-TKED) of fission fragments of the reaction Th were measured at two laboratory energies and MeV using the CORSET set up at the Flerov Laboratory of Nuclear Reactions. The transfer-induced fission and/or the breakup of Li mainly into alpha ( ) and deuteron ( d ) clusters contribute to the incomplete fusion in this reaction. The binary events within the gate of in the reaction plane of the fission fragment folding angle distribution have only been considered discarding the incomplete fusion events, for multi-modal analysis. Two-dimensional M-TKEDs of the binary fragments of Th, have been described by the multi-modal random neck rupture (MM-RNR) model. Three modes were necessary to fit the data properly. Channel probabilities and the characteristics of different fission modes are obtained and discussed. The average kinetic energy release in fission obtained from Viola systematic matches well with that of the Standard 2 mode, but not with that of broad liquid drop like Superlong mode. This is associated with the decrease of the total kinetic energy associated with asymmetric fission with increasing excitation ( ) due to fading out of shell effects at high excitation energies.