Bi-dimension Position Sensitive Detector Used in the Study of Fusion Fission of Heavy Ions at the Sub-Coulomb Barrier Energy Region

Tan Jilian; Zhang Jinxia; Jin Genming; Zhang Huanqiao; Qian Xing; Liu Zuhua; Xu Jincheng

Chinese Physics C> 1997, Vol. 21> Issue(S2) : 1-8

Bi-dimension Position Sensitive Detector Used in the Study of Fusion Fission of Heavy Ions at the Sub-Coulomb Barrier Energy Region

1. Institute of Modem Physics, The Chinese Academy of Sciences, Lanzhou, China;
2. China Institute of Atomic Energy, Beijing, China

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Abstract：
The structure, operation principle, and performance of the bi-dimension position sensitive avalanche chamber (BPAC) used in the study of fusion fission induced by heavy ions at the near- and sub-barrier energy regions are described.
The fold angle distribution of fragments in different angle regions for the 84 MeV (E_cm) ¹⁶O+²³²Th reaction system was obtained by using BPAC, from which the angle distribution of transfer-fission fragments has been distinguished from that of compound nucleus fission fragments. It is thereby certified that transfer Hssion is not the reason for anomalous anisotropies of fragment angular distribution. Meanwhile experimental results supported the pre-equilibrium fission model, in the frame of which the anomalous anisotropies of fragment distribution were explained.
- fusion Hssion ,
- position sensitive avalanche chamber ,
- angle distribution of fragments

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Tan Jilian, Zhang Jinxia, Jin Genming, Zhang Huanqiao, Qian Xing, Liu Zuhua and Xu Jincheng. Bi-dimension Position Sensitive Detector Used in the Study of Fusion Fission of Heavy Ions at the Sub-Coulomb Barrier Energy Region[J]. Chinese Physics C, 1997, 21(S2): 1-8.

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Received: 1995-12-12

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沈阳化工大学材料科学与工程学院沈阳 110142

Bi-dimension Position Sensitive Detector Used in the Study of Fusion Fission of Heavy Ions at the Sub-Coulomb Barrier Energy Region

1. Institute of Modem Physics, The Chinese Academy of Sciences, Lanzhou, China;
2. China Institute of Atomic Energy, Beijing, China

Received Date: 1995-12-12

Abstract: The structure, operation principle, and performance of the bi-dimension position sensitive avalanche chamber (BPAC) used in the study of fusion fission induced by heavy ions at the near- and sub-barrier energy regions are described.
The fold angle distribution of fragments in different angle regions for the 84 MeV (E_cm) ¹⁶O+²³²Th reaction system was obtained by using BPAC, from which the angle distribution of transfer-fission fragments has been distinguished from that of compound nucleus fission fragments. It is thereby certified that transfer Hssion is not the reason for anomalous anisotropies of fragment angular distribution. Meanwhile experimental results supported the pre-equilibrium fission model, in the frame of which the anomalous anisotropies of fragment distribution were explained.