March 30, 2001

Peculiarities of fission of actinide nuclei formed in reactions with light particles

Key Points

Fission fragment mass distributions are influenced by angular momentum and excitation energy in actinide nuclei.
In the energy range up to 140 MeV, critical angular momentum values were established for fission processes involving alpha-particles.
A novel approach to describe fission fragment mass distributions incorporates angular momentum considerations for nucleic interactions.
Experimental data on fission products from various interactions revealed dependencies on the excitation energy up to 30 MeV.

Abstract

The analysis of total fission cross-sections for interaction of α-particles with nuclei 232Th, 235U, 236U and 238U in the energy range up to 140 MeV is carried out. The energy dependence of critical value of angular momentum leading to a fissioning system formation for interaction of α-particles with uranium nuclei in a given energy range is obtained. The new approach for description of fission fragment mass distributions of actinide nuclei with accounting of influence of a total angular momentum is offered. The experimental fission fragment mass distributions of nuclei 236U, 239Pu and 240Pu formed in reactions with neutrons, γ-quanta, α-particles and spontaneous fission in an excitation energy range up to 30 MeV are considered within the framework of the present approach. The parameters dependence of fragment mass distributions on excitation energy and transferred angular momentum of a fissioning nucleus is obtained.

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