Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei
- Voronezh State University, Universitetskaya pl. 1, Voronezh, 394693 (Russian Federation)
It is shown that A. Bohr's concept of transition fission states can be matched with the properties of Coriolis interaction if an axisymmetric fissile nucleus near the scission point remains cold despite a nonadiabatic character of nuclear collective deformation motion. The quantum and thermodynamic properties of various stages of binary and ternary fission after the descent of a fissile nucleus from the outer saddle point are studied within quantum-mechanical fission theory. It is shown that two-particle nucleon-nucleon correlations--in particular, superfluid correlations--play an important role in the formation of fission products and in the classification of fission transitions. The distributions of thermalized primary fission fragments with respect to spins and their projections onto the symmetry axis of the fissile nucleus and fission fragments are constructed, these distributions determining the properties of prompt neutrons and gamma rays emitted by these fragments. A new nonevaporation mechanism of third-particle production in ternary fission is proposed. This mechanism involves transitions of third particles from the cluster states of the fissile-nucleus neck to high-energy states under effects of the shake-off type that are due to the nonadiabatic character of nuclear collective deformation motion.
- OSTI ID:
- 20692917
- Journal Information:
- Physics of Atomic Nuclei, Vol. 68, Issue 12; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 2030-2041 (No. 12, 2005); DOI: 10.1134/1.2149077; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:; ISSN 1063-7788
- Country of Publication:
- United States
- Language:
- English
Similar Records
The quantum and thermodynamical characteristics of fission taking into account adiabatic and nonadiabatic modes of motion
Nonuniform character of the population of spin projections K for a fissile nucleus at the scission point and anisotropies in the angular distributions of fragments originating from the induced fission of nuclei
Related Subjects
AXIAL SYMMETRY
CORRELATIONS
DEFORMED NUCLEI
DISTRIBUTION
FISSION FRAGMENTS
FISSION PRODUCTS
GAMMA RADIATION
NUCLEAR DEFORMATION
PHOTON EMISSION
PROMPT NEUTRONS
QUANTUM MECHANICS
SCISSION-POINT MODEL
SPIN
SPONTANEOUS FISSION
SUPERFLUIDITY
TERNARY FISSION
THERMODYNAMIC PROPERTIES