2021 Fiscal Year Research-status Report
Macroscopic Nuclear Dynamics with Microscopic Foundations
| Project/Area Number |
20K14458
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| Research Institution | University of Tsukuba |
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Principal Investigator |
温 凱 筑波大学, 計算科学研究センター, 研究員 (00861105)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | nuclear reaction / collective coordinate / collective inertial mass / mass parameter |
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| Outline of Annual Research Achievements |
With the theorecial method developed in the previous fiscal year, for the theoretical description of nuclear fusion/fission reactions, in the last fiscal year we calculated the collective inertial mass coefficients with respect to translational, relative, and rotational motions based on a microscopical method---the adiabatic self-consistent collective coordinate (ASCC) method. At the same time, in depth we investigated the impact of the time-odd component of the mean-field potential on these inertial masses, so as to understand the microscopic dynamics of nuclear reactions. The inertial masses calculated based on our theoretical method reproduces the exact total nuclear mass for the translational motion as well as the exact reduced masses as the asymptotic values for the relative and rotational motions, which is proof of the correctness of our calculation.In contrast, the conventional cranking formulas fail to do so. This is due to the fact that the (local) Galilean invariance is properly restored in our ASCC method but violated in the cranking formulas. A model Hamiltonian for low-energy nuclear reaction is constructed with the microscopically derived potentials and inertial masses with our model, the astrophysical S factors are calculated, which indicates the importance of microscopic calculation of proper inertial masses. Our results are partly published on journal Physical Review C.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Taking into account the effect of super conductiviy in nuclear reactions turns out to be a chanlenging task. New theoretical and numerical problems appears during the progress our work. Generally progress is being made smoothly.
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| Strategy for Future Research Activity |
With the theoretical method developed in the past fiscal year, I'm going to calculate the optimal collective coordinate for nuclear fussion/fission reactions, so as to understand the microscopic mechanism of the reactions.
Then I will take into accout the super conductivity effect in the calculations, upgrade our work from schematic calculation to realistic analysis.
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| Causes of Carryover |
Due to the cancelation of travel plans in the pandemic, as well as the unexpected theoretical prolems to be solved, certain amount of budget incurred.
Next, more sophisticated theoretical analysis and calculation are going to be carried out. I'm buying references about theoretical and computational sciences for implementing numerical calculations. If possible I'm planning to
travel to the institutes of my collaborators for presentations and discussions.
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