Landau-Zener Effects in Nuclear Heavy-Ion Reactions

核重离子反应中的朗道-齐纳效应

• 批准号: 61540208
• 负责人: ABE Yasuhisa
• 金额: $ 0.77万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61540208/
• 关键词: Landau-Zener Effects; Heavy-Ion Nuclear Reactions; 共鳴機構; ランダウ・ジナー効果

1. Investigations have been made on whether Landau-Zener level crossings in nuclear heavy-ion collisions cause resonance-like enhancements in transition cross sections. Semi-classical estimates were already shown by the head investigator to give enhanced cross sections corresponding to experiments. Quantum mechanical calculations have been performed with a simple two-level model, but have turned out to give only slight enhancements. In order to understand this difference, analytical treatments are now being pursuites, for example, by DWBA.2. In order to perform the above investigations, we have developped a new formalism, i.e., a scattering formalism in the body-fixed frame, which enables us to accomodate 2-center shell model in scattering problem.3. Furthermore, we have critically investigated the vibration-rotation models for molecular resonances. It has been shown that neglects of rotation-vibration couplings cause completely misleading results.

1. 研究了核重离子碰撞中的朗道-齐纳水平交叉是否会引起跃迁截面的共振增强。半经典估计已经被首席研究员证明可以给出与实验相对应的增强截面。量子力学计算是用一个简单的两级模型进行的，但结果只得到了轻微的增强。为了理解这种差异，现在正在进行分析处理，例如DWBA.2。为了进行上述研究，我们发展了一种新的形式，即固定体框架下的散射形式，使我们能够在散射问题中采用双中心壳模型。此外，我们批判性地研究了分子共振的振动-旋转模型。研究表明，忽略旋转-振动耦合会导致完全错误的结果。

项目成果

Y. Abe.: "Langevin Approach to Nuclear Dissipative Dynamics" Journal de Physique no.8. 47. 305-315 (1986)

Y. Abe.：“Langevin Approach to Nuclear Dissipative Dynamics”Journal de Physique no.8。

N. Ohta: Proc. RIKEN-IN2P3 Symp. on Heavy-Ion Collisions.

N.太田：Proc。

Y.Abe: Journal de Physique no.8. 47. c4305-c4315 (1986)

Y.Abe：《体质杂志》第 8 期。

K. Kato: to be submitted to Prog. Theor. Phys.

K. Kato：将提交给 Prog。

A.V. Matveenko: "Asymptotically Adapted Three-Body Molecular States" Few-Body Systems. 2. 127-143 (1987)

AV