1992 Fiscal Year Final Research Report Summary
Mechanism of intermediate-energy heavy-ion collisions
Project/Area Number |
03640279
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Research Category |
Grant-in-Aid for General Scientific Research (C)
|
Allocation Type | Single-year Grants |
Research Field |
核・宇宙線・素粒子
|
Research Institution | Kyorin University |
Principal Investigator |
TOHYAMA Mitsuru Kyorin University, School of medicine, Associate Professor, 医学部, 助教授 (30183875)
|
Project Period (FY) |
1991 – 1992
|
Keywords | Heavy-ion collisions / Numerical simulations / Boltzmann equation / Density-matrix theory |
Research Abstract |
Experimental data on intermediate-energy heavy-ion collisions have recently been accumulated. Numerical simulations based on the classical Boltzmann equation have extensively been done to analyze the data. Nuclei are highly degenerate quantum systems consisting of a small number of nucleons, however. Therefore it is necessary to understand under what conditions such a classical treatment of nuclear collisions is justified. To answer this problem, we made a comparison between the solution of a quantal model and he classical solution for a simple two-dimensional system. The quantal model which we used in this study is the time-dependent density-matrix theory(TDDM). It is found that the classical solution has a temporal behavior which is qualitatively similar to that in TDDM. Quantitatively, however, there is a significant difference in the time when the relaxation due to nucleon-nucleon collisions starts : in the classical model the relaxation begins immediately after colliding nuclei overlap, while in the quantal model it is delayed. This can be attributed to a non-Markovian treatment of nucleon-nucleon collisions in TDDM.
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Research Products
(6 results)