Decisive role of wriggling vibrations in the formation of angular and spin distributions of products originating from binary and ternary fission of oriented nuclei

Journal Article · Fri Sep 15 04:00:00 EDT 2017 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S106377881705012X· OSTI ID:22759651

Bunakov, V. E. ^[1]; Lyubashevsky, D. E. ^[2]

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1. National Research Center Kurchatov Institute, Petersburg Nuclear Physics Institute (Russian Federation)
2. Voronezh State University (Russian Federation)

It is shown that the multiplicities and angular and energy distributions of neutrons and photons evaporated from thermalized fragments originating from the spontaneous and low-energy induced fission of nuclei, the relative yields of ground and isomeric states of final fragments, and the features of delayed neutrons emitted upon the beta decay of the above fragments can successfully be described by employing nonequilibrium distributions of spins and relative orbital angular momenta of fission fragments formed in the vicinity of the scission point for the fissile nucleus being studied. It is also shown that these distributions, which are characterized by large mean values of the spins and orbital angular momenta directed orthogonally to the symmetry axis of the fissioning nucleus are successfully constructed upon simultaneously taking into account zero-mode transverse wriggling and bending vibrations of a fissile compound nucleus in the vicinity of its scission point, the wriggling vibrations being dominant. It is confirmed that the zero-mode wriggling vibrations considered immediately above are directly involved in the formation of the angular distributions of fragments originating from the spontaneous and low-energy fission of nuclei. This makes it possible to describe successfully such distributions for photofission fragments.

• OSTI ID: 22759651
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 5 Vol. 80; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BETA DECAY
BETA-DELAYED NEUTRONS
COMPOUND NUCLEI
DELAYED PROTONS
ENERGY SPECTRA
FISSION FRAGMENTS
MULTIPLICITY
ORBITAL ANGULAR MOMENTUM
ORIENTED NUCLEI
PHOTOFISSION
SPIN
TERNARY FISSION