Evidence for competing bi-faceted compound nucleus fission modes in 232Th(α,f) reaction

• DOI: 10.1016/j.physletb.2021.136848
• Publication Date: 2021-12-29T16:45:01Z
• Authors: Aniruddha Dey; D.C. Biswas; A. Chakraborty; S. Mukhopadhyay; A.K. Mondal; K. Mandal; B. Mukherjee; R. Chakrabarti; B.N. Joshi; L.A. Kinage; S. Chatterjee; S. Samanta; S. Das; Soumik Bhattacharya; R. Banik; S. Nandi; Shabir Dar; R. Raut; G. Mukherjee; S. Bhattacharyya; S.S. Ghugre; A. Goswami
• Keywords: Multiplicity (mathematics); Spontaneous fission; Nuclear fission

Relative isotopic yield distributions have been extracted for nine correlated fission fragment pairs following a detailed analysis of prompt γ−γ coincidence events from 232Th(α,f) reaction at Elab = 30 MeV. Simultaneously, the charge and mass even-even fragments obtained measured relative yields. The onset triple-hump structure is seen in as well fragments. results are consistent with two-mode hypothesis compound nucleus good agreement theoretical predictions, based on relevant models. provide experimental evidence presence two distinct modes, where asymmetric symmetric components 83% 17%, respectively. An average neutron multiplicity value 4.60 ± 0.09 has obtained, distribution pattern corroborates observed features multifaceted modes. Comparing surrogate reaction, which produces 236U⁎ an excitation energy 21.5 MeV, that direct 14 MeV induced 235U, increase about 11% component observed.