Chinese Physics C > 1996, Vol. 20 > Issue(S3): 233-241

Threefold Fragmentation in Hot.Nuclei with Medium Masses

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

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Abstract：
The threefold massive fragment in hot nuclei with medium mass number has been measured in ⁴⁰Ar+ ¹¹⁵In, ¹⁰³Rh, and ⁹³Nb reactions at 25MeV/u. The fragments emitted at angles larger than 32° are detected by ten parallel plate position-sensitive avalanche counters (PPAC), each with an area of 25×20cm ². The total kinetic energies ( TKE),the yield ratio P ³²of the threefold fragmentation to Hssion,and the distributions of the fragment mass, velocity, and relative angle,etc., are obtained. From the mass ratio of the fragments, a simple empirical expression is deduced. By analyzing their angular correlation function with a simple space-time model, the time difference between two scission points in the threefold process in the Ar+In reaction system is derived. A systematics of P ³²versus Z ²/ Afor hot nuclei is observed.
- hot nucleus,
- threefold fragmentation,
- angular correlation function,
- clusterization of nuclear matter,
- time differences between two scissions

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Dai Guangxi, Wu Heyu, Duan Limin, Li Zuyu, He Zhiyong, Luo Qingzheng and Zhang Baoguo. Threefold Fragmentation in Hot.Nuclei with Medium Masses[J]. Chinese Physics C, 1996, 20(S3): 233-241.

Dai Guangxi, Wu Heyu, Duan Limin, Li Zuyu, He Zhiyong, Luo Qingzheng and Zhang Baoguo. Threefold Fragmentation in Hot.Nuclei with Medium Masses[J]. Chinese Physics C, 1996, 20(S3): 233-241. shu

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Received: 1995-06-15

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Supported by the National Natural Science Foundation of China and the Director Foundation of IMP, the Chinese Academy of Sciences.

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沈阳化工大学材料科学与工程学院沈阳 110142

Threefold Fragmentation in Hot.Nuclei with Medium Masses

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

Received Date:1995-06-15

Fund Project:Supported by the National Natural Science Foundation of China and the Director Foundation of IMP, the Chinese Academy of Sciences.

Abstract:The threefold massive fragment in hot nuclei with medium mass number has been measured in⁴⁰Ar+¹¹⁵In,¹⁰³Rh, and⁹³Nb reactions at 25MeV/u. The fragments emitted at angles larger than 32° are detected by ten parallel plate position-sensitive avalanche counters (PPAC), each with an area of 25×20cm². The total kinetic energies (TKE),the yield ratioP³²of the threefold fragmentation to Hssion,and the distributions of the fragment mass, velocity, and relative angle,etc., are obtained. From the mass ratio of the fragments, a simple empirical expression is deduced. By analyzing their angular correlation function with a simple space-time model, the time difference between two scission points in the threefold process in the Ar+In reaction system is derived. A systematics ofP³²versusZ²/Afor hot nuclei is observed.