Anatomy of neck configuration in fission decay

Abstract

The anatomy of neck configuration in the fission decay of Uranium and Thorium isotopes is investigated in a microscopic study using Relativistic mean field theory. The study includes ${}^{236}U$ and ${}^{232}Th$ in the valley of stability and exotic neutron rich isotopes ${}^{250}U$, ${}^{256}U$, ${}^{260}U$, ${}^{240}Th$, ${}^{250}Th$, ${}^{256}Th$ likely to play important role in the r-process nucleosynthesis in stellar evolution. Following the static fission path, the neck configurations are generated and their composition in terms of the number of neutrons and protons are obtained showing the progressive rise in the neutron component with the increase of mass number. Strong correlation between the neutron multiplicity in the fission decay and the number of neutrons in the neck is seen. The maximum neutron-proton ratio is about 5 for ${}^{260}$U and ${}^{256}$Th suggestive of the break down of liquid-drop picture and inhibition of the fission decay in still heavier isotopes. Neck as precursor of a new mode of fission decay like multi-fragmentation fission may also be inferred from this study.

16 pages, 5 figures (Accepted)

References in corpus (6)

• Structure properties of ${}^{226}$Th and ${}^{256,258,260}$Fm fission fragments: mean field analysis with the Gogny force
• Microscopic calculation of 240Pu scission with a finite-range effective force
• Fission modes of 256Fm and 258Fm in a microscopic approach
• Emission of Scission Neutrons in the Sudden Approximation
• Origin of the narrow, single peak in the fission-fragment mass distribution for ${}^{258}$Fm
• Exotic fission properties of highly neutron-rich Uranium isotopes

Cited by in corpus (6)

• Probable Decay Modes at Limits of Nuclear Stability of the Superheavy Nuclei
• Study of hot thermally fissile nuclei using relativistic mean field theory
• Ternary fission within the temperature dependent relativistic mean field approach
• Relative mass distributions of neutron-rich thermally fissile nuclei within statistical model
• Neck configuration of Cm and Cf nuclei in the fission state within relativistic mean field formalism
• The Oxygen core inside the Magnesium isotopes