| Project/Area Number |
61540202
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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 | SHINSHU UNIVERSITY |
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Principal Investigator |
MATSUSE Takehiro Faculty of Textile Science and Technology, Shinshu University., 繊維学部, 助教授 (30027354)
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| Co-Investigator(Kenkyū-buntansha) |
LEE Sang-Mu Institute of Physics and Tandem Accelerator Center, University of Tsukuba., 物理学系, 助教授 (10175028)
SUZUKI Akihiro Faculty of Textile Science and Technology, Shinshu University., 繊維学部, 助教授 (20021173)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Extended Hauser Feshbach Method / Scission Point Model / Fission Phenomena in Heavy Ion Reaction / Viola's Systematics / Deformation Energy / Level Density Parameter / Shell Structure Energy / Fission Phenomena in Heavy Ion Reaction |
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| Research Abstract |
In order to make clear the mechanisum of the fusion-fission phenomena, espetially the competition between fusion-evaporation and fusion-fission indeced by low energy heavy-ion reactions, we have performed the statistical analysis.
At first the view point of the scission point model has been applied for making the statistical model. Because Hauser-Feshbach method is very valid for reproducing the evaporation phenomena of light particle emissions, as is already pointed out by T.Ericson we have extended the method for investigating fusion-fission phenomena (extended Hauser Feshbach method). In this project the deformation effect of fissin fragments at scission point has veen mainly introduced to the extended Hauser-Feshbach method.
In the region of nucleus with Z^2/A<less than or similar>30 our statistical model reproduce well both the observed mass distribution and total kinetic energy distribution. Furtheremore, it has been shown that the model is very valid for investigating the light fr
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agments emissions in the intermediate energy region (E^L/A<less than or similar>20 Mev).
For the heavy nucleus (Z^2/A<greater than or similar>30), the extended Hauser-Feshbach method reproduce well the total kinetic energy distribution, but it was difficult to reproduce the observed quantities of the competition between evaporation and fission. In order to reproduce the competition we have reinvestigated the statistical model based on the saddle point model. The CPS fission barrier is used without adjustment parameter. Up to now many studies have been performed by the use of CPS fission barrier and it is well known that the adjustment for the barrier is necessary. But in this study we could reproduce well the competition without the scaling factor. The reason is that the observed binding energy with pairing correction for determining the neutron separation energy is used. After determination of the total fission ratio at saddle point, the flux fission is distibuted to the available fission fragments at scission point by extended Hauser-Feshbach method. It has been concluded that out statistical model can reproduce well not only mass distribution but also angular distributieve Less
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