“Subthreshold” reactions involving nuclear fission

“ Fission Chips ” - Unusual Flavors ( Dynamic nuclear instabilities in fission - like reactions )

Fission of cold nuclei is essentially a binary, adiabatic process, with only a minute probability for the emission of associated light charged clusters. In contrast, nuclear systems in fast heavy-ion reactions respond to significant mechanical and thermal stresses by exhibiting more complex, ternary and quaternary fission-like disintegration patterns. As an example, aligned ternary and quaterna...

Nuclear Reactions of Astrophysical Interest Involving Light Nuclei

An introduction to nucleosynthesis, the creation of the elements in the big bang, in interstellar matter and in stars is given. The two–step process He(2n,γ)He and the reverse photodisintegration He(γ,2n)He involving the halo nucleus He could be of importance in the α–process in type–II supernovae. The reaction rates for the above processes are calculated using three–body methods and show an en...

Calculations of Nuclear Reactions of Astrophysical Interest Involving Unstable Nuclei

Nuclear reactions involving unstable nuclei play an important role in nucleosyn-thesis. Such reactions are mainly associated with explosive astrophysical scenarios occurring at the nal stages of stellar evolution. For many nuclear reactions involving unstable nuclei the direct reaction mechanism cannot be neglected and may even be the dominant reaction mechanism. For example, the direct{reactio...

The Mechanism of Nuclear Fission

On the basis of the liquid drop model of atomic nuclei, an account is given of the mechanism of nuclear fission. In particular, conclusions are drawn regarding the variation from nucleus to nucleus of the critical energy required for fission, and regarding the dependence of fission cross section fo'r a given nucleus on energy of the exciting agency. A detailed discussion of the observations is ...

Nuclear Reactions