2017 Fiscal Year Research-status Report
Nonlocalized cluster dynamics and multi-cluster resonance states
| Project/Area Number |
17K14262
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| Research Institution | Hokkaido University |
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Principal Investigator |
周 波 北海道大学, 国際連携機構, 助教 (80749755)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Keywords | cluster structure / Brink wave function / THSR wave function / Container picture |
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| Outline of Annual Research Achievements |
A new trial wave function for the nuclear cluster structure of nuclei was proposed, in which the widths of the single-nucleon Gaussian wave packets and the widths of the relative Gaussian wave functions charactrized by nonlocalized clustering are treated as variables. And the center-of-mass problem can be exactly treated in the constructed new wave function. As an example, this wave function was applied to study the typical 20Ne cluster system.
In analogy to the 3α gas-like cluster structure in 12C, it is a very interesting subject to investigate the developed 2α + t cluster structure. We investigated 11B by the microscopic generator coordinate method with the Brink cluster wave functions and many states are proposed as the well-developed cluster states or multi-cluster resonance states.
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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
A new cluster wave function was proposed and the different width problems in nuclear cluster physics can be treated in this framework. This was not originally planned. Now, this wave function is being applied to describe some light nuclear systems, e.g., 6He(alpha+2n). The important role of the width variables of clusters will be studied.
Some cluster states of the 11B around the 2α + t threshold energy have been obtained by using the traditional cluster model. The negative-parity states of 12C are also studied within the container picture. Now, by using the resonance methods, the excited cluster states, especially the resonance states are expected to be described in a more accuracy way.
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| Strategy for Future Research Activity |
The proposed cluster states of 11B will be studied further by some resonance methods, e.g., the radius constraint method. The detailed structure of these cluster resonance states will be investigated. For example, the reduced width amplitude should be calculated for studying the characters of the cluster states.
By using an extended 2α+α THSR wave function, the negative-parity states of 12C will be studied. We should know whether or not these negative parity states can be described well in the container picture or based on the concept of the nonlocalzied clustering. We plan to deal with the resonance states by the radius constraint method and the simple variational calculations.
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| Causes of Carryover |
I will attend some International conferences in the second fiscal year. Therefore, I need to use more budget than that in the last year.
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