A model to describe fission on light actinides, which takes into account transmission through a triple-humped fission barrier with absorption, is proposed. The fission probability derived in the WKB approximation within an optical model for fission has been incorporated into the statistical model of nuclear reactions. The complex resonant structure in the first-chance neutron-induced fission cross sections of Th232 and Pa231 nuclei has been reproduced by the proposed model. Consistent sets of parameters describing the triple-humped fission barriers of Th233 and Pa232 have been obtained. The results confirm the attribution of the gross resonant structure in the fission probability of these light actinides to partially damped vibrational states in the second well and undamped vibrational states in the third well of the corresponding fission barriers. © 2006 The American Physical Society.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Sin, M., Capote, R., Ventura, A., Herman, M., & Obložinský, P. (2006). Fission of light actinides: Th232(n,f) and Pa231(n,f) reactions. Physical Review C - Nuclear Physics, 74(1), -. . https://doi.org/10.1103/PhysRevC.74.014608