Decay Rate of a Multidimensional System--application to particle evaporation from a compound nucleus and fission (原子核集団ダイナミックスの新動向)
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概要
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I discuss two subjects concerning the decay of a metastable state in a system with many degrees of freedom. In the first part, I discuss the effect of a surface vibration of the residual nucleus on the energy spectrum of particles emitted from a hot compound nucleus. In the second part, I derive a formula of the fission width based on a path integral evaluation of the imaginary part of the free energy, and discuss how the Kramers formula is modified by the memory effect for viscosity and by the quantum fluctuation of the fission path. Attention is particularly paid to the effects of the finite range property of the coupling Hamiltonian between the fission coordinate and the environmantal degrees of freedom, which are represented by a set of harmonic oscillators. Also, I sketch the present understanding of the large enhancement of the heavy ion fusion cross section at sub-barrier energies.
- 素粒子論グループ 素粒子研究編集部の論文
- 1991-07-20
著者
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Takigawa Noboru
Department Of Physics Graduate School Of Science Tohoku University
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Takigawa N.
Department Of Physics Tohoku University
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Takigawa N.
Department Of Physics Faculty Of Science Tohoku University
関連論文
- Projectile Fragmentation of Halo Nuclei in the Peripheral Direct Reaction Model
- Non-Adiabatic Effects in Macroscopic Quantum Tunneling (原子核における散逸・拡散・揺らぎの理論)
- Influence of Tunneling on Electron Screening in Low Energy Nuclear Reactions
- Recent Theoretical Activities of Heavy-Ion Fusion Reactions in Sendai
- Energy Averages over Regular and Chaotic States in the Decay Out of Superdeformed Bands
- The Systematic Structure-Change into the Molecule-like Structures in the Self-Conjugate 4n Nuclei
- Attenuation of the Intensities within a Superdeformed Band (原子核の量子トンネル崩壊現象)
- Forward Nuclear Glory Scattering of a Halo Nucleus
- Effects of Dissipation on Fast Quantum Tunneling
- 24pWG-7 Constrained Mean Field for Neutron-Rich Nuclei
- Heavy-Ion Fusion Reactions as Macroscopic Quantum Tunneling
- Opening Address
- Heavy-ion fusion reactions with proton rich and neutron rich isotopes (不安定核の構造と反応)
- Multi-Neutron and Proton Transfer Reactions in Deep Inelastic Heavy-Ion Collisions
- Semiclassical Mean Field Theory of Quantum Tunneling in a Coupled System (原子核の量子トンネル崩壊現象)
- Fusion from an excited state (原子核の量子トンネル崩壊現象)
- Opening Address
- Quantum effect in the diffusion along a potential barrier (原子核の複雑さと散逸)
- Heavy-Ion Fusion Reactions with a Halo Nucleus : Large Enhancement of the Tunneling Probability
- Decay Rate of a Multidimensional System--application to particle evaporation from a compound nucleus and fission (原子核集団ダイナミックスの新動向)
- Constrained Mean Field Calculations For Neutron Rich Nuclei(YITP Workshop on New Developments in Nuclear Self-Consistent Mean-Field Theories (MF05))
- Subbarrier Fusion Reactions and Many-Particle Quantum Tunneling
- Subbarrier Fusion Reactions and Many-Particle Quantum Tunneling