Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei

Journal Article · Thu Dec 01 04:00:00 EST 2005 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/1.2149077· OSTI ID:20692917

Kadmensky, S G ^[1]

---

1. 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, Journal Name: Physics of Atomic Nuclei Journal Issue: 12 Vol. 68; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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