1996 Fiscal Year Final Research Report Summary
DEFORMATION PATHS OF A NUCLEUS IN FISSION
| Project/Area Number |
06452034
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | TOKYO METROPOLITAN UNIVERSITY |
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Principal Investigator |
NAKAHARA Hiromichi FACULTY OF SCIENCE TOKYO METROPOLITAN UNIVERSITY PROFESSOR, 理学部, 教授 (00027137)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAME Yuichiro ISOTOPE DIVISION JAPAN ATOMIC ENERGY RESEARCH INSTITUTE ASSOCIATE RESEARCHER, アイソトープ部, 副主任
SUEKI Keisuke FACULTY OF SCIENCE TOKYO METROPOLITAN UNIVERSITY ASSISTANT, 理学部, 助手 (90187609)
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| Project Period (FY) |
1994 – 1996
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| Keywords | TWO DEFORMATION PATHS / PROTON-INDUCED FISSION / SYMMETRIC FISSION / ASYMMETRIC FISSION / ^<232>Th / ^<238>U / 2つのモード |
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| Research Abstract |
Two kinds of kinetic energy components were discovered present for the fission producing fission fragments of A=126-134 in proton induced fission of ^<232>th.
In the present work, the incident energy dependence of the intensity of each of those two components was studied for proton-induced fission of ^<232>Th and ^<238>U by varying the proton energy from 12 to 16 MeV.The kinetic energies were carefully measured by the double TOF method. The time calibration of the time-of-flight system was performed using the 240 MeV ^<127>I beam from a tandem accelerator.
The results clearly indicated that the intensity of the low kinetic energy component has the incident energy dependence similar to the mass yields of symmetric-mass-division products have while the intensity of high kinetic energy component behaves similarly to the yields of asymmetric-mass-division products.
They lead to the conclusion that two deformation paths indeed exist in the low energy fission of light actinide : "one path experiences a higher fission barrier and ends up in symmetric mass division with the more elongated scission configuration, and the other goes over a lower fission barrier and leads to asymmetric mass division with more compact scission configuration.
Those two deformation paths co-exist in the fission which produce fragments mass of 126 to 134.
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[Publications] Y.Nagame, I.Nishinaka, K.Tsukada, Y.Oura, S.Ichikawa, H.Ikezoe, Y.L.Zhao, K.Sueki, H.Nakahara, M.Tanikawa, T.Ohtsuki, H.Kudo, Y.Hamajima, K.Takamiya, Y.H.Chung: "Two deformation paths in proton-induced fission of ^<232>Th." Physics Latters B. 387. 26-30 (1996)
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