1988 Fiscal Year Final Research Report Summary
Study of Nucleon Molecular Orbitals in Nucleus-Nucleus Collisions
| Project/Area Number |
62540196
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | University of Tokyo |
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Principal Investigator |
IMANISHI Bunryu Institute for Nuclear Study, University of Tokyo, 原子核研究所, 助教授 (70092145)
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| Project Period (FY) |
1987 – 1988
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| Keywords | molecular orbital / nucleus-nucleus collision / coupled-reaction-channel theory / Landau-Zener transition / adiabatic potential / radial coupling / ランダウ・ツェナー遷移 / diabatic系 |
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| Research Abstract |
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
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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
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Research Products
(10 results)
