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Study of Nucleon Molecular Orbitals in Nucleus-Nucleus Collisions

核-核碰撞中核子分子轨道的研究

基本信息

批准号：
62540196
负责人：
IMANISHI Bunryu
金额：
$ 1.22万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

The molecular orbitals of nucleons in nucleus-nucleus collisions have been investigated by using the formalism based on the coupled-reaction-channel (CRC) method.A specific transition, Landau-Zener transition definitely predicts the observation of characteristic changes in the cross sections for the inelastic scattering ^<13>C(^<12>C,^<12>C)^<13>C*(3.09MeV,1/2^+) with the change of the bombarding energy. Also the "two-step" transition via the above Landau-Zener promotion explains the behaviour of the observed cross sections of the inelastic scattering going to the excited state ^<13>C*(3.85MeV,5/2^+).Our molecular orbitals are defined with the inclusion of the dynamical effects of the scatterings, i.e., the effects of the recoil due to the non-negligible mass ratio of molecular-orbital nucleons to core nuclei. It is shown that the effects appear not so much in molecular-orbital states themselves as in the adiabatic potentials and the radial couplings. This causes big changes of the tra … More nsition amplitudes due to the dynamical effects generally.In order to investigate nucleon molecular orbitals for "asymmetric core" system, we have completed the computer programs for the CRC- and the molecular-orbital calculations. Preliminary calculation for light core systems shows strong CRC effects in the original basis. Reflecting this effects, the molecular orbitals obtained are dynamically stable in the grazing region as in the case of symmetric core systems. However, ground-state adiabatic potentials are not necessarily isolated from the other excited-state potentials as in symmetric core systems.Next research program of our study of nucleon molecualr orbitals is the followings:(i) to construct the "diabatic systems" from our molecualr orbital systems to understand the Landau-Zener transition mechanism in quantum mechanical way, (ii) to investigate the effects of strong Coulomb field for "proton" molecular orbitals with heavy core nuclei, and (iii) to take into account the effects of the collective states of core nuclei explicitely in the formation of nucleon molecular orbitals. Less

用基于耦合反应道（CRC）方法的形式化方法研究了核-核碰撞中核子的分子轨道，Landau-Zener跃迁是一种特殊的跃迁，它明确地预言了非弹性散射^<13>C（^<12>C，^<12>C）^<13>C*（3.09MeV，1/2^+）截面随轰击能量变化的特征.另外，通过上述Landau-Zener推广的“两步”跃迁解释了所观察到的非弹性散射到激发态^<13>C*（3.85MeV，5/2^+）的截面的行为。由于分子轨道核子与核心核的质量比不可忽略而产生的反冲效应。结果表明，这种效应在绝热势和径向耦合中表现得不如在分子轨道态中表现得那么明显。这引起了贸易的巨大变化。 ...更多信息为了研究“非对称核”系统的核子分子轨道，我们编制了相应的CRC-和分子轨道计算程序。对轻堆芯系统的初步计算表明，在原始基础上有很强的CRC效应。反映这种影响，所获得的分子轨道是动态稳定的掠射区的对称核心系统的情况下。然而，基态绝热势并不像对称核系统那样与其它激发态势相互隔离。我们研究核子分子轨道的下一步研究计划如下：（i）从我们的分子轨道系统出发，构造“非绝热系统”，从量子力学的角度理解Landau-Zener跃迁机制;（ii）研究强库仑场对具有重核的“质子”分子轨道的影响;（iii）在核子分子轨道的形成过程中考虑了核心核集体态的影响。少