The Threefold Fragmentation of Hot Nuclei With Medium Mass Number

Dai Guangxi; Wu Heyu; Duan Limin; Li Zuyu; He Zhiyong; Luo Qingzheng; Zhang Baoguo

Chinese Physics C> 1996, Vol. 20> Issue(7) : 588-595

The Threefold Fragmentation of Hot Nuclei With Medium Mass Number

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

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Abstract：
The threefold fragmentation in hot nuclei with medium mass number has been measured in 25MeV/u ⁴⁰Ar+¹¹⁵In, ¹⁰³Rh,⁹³Nb reactions. The fragments emitted at angles larger than 32°were detected by ten parallel plate position-sensitive avalanche counters (PPAC) with area of 25×20cm² for each. The quantities of total kinetic energy (TKE), the yield ratio of threefold over fission P₃₂, the distributions of fragment mass, velocity and relative angle etc. were obtained. From the mass ratio of the fragment, a simple empirical expression could be deduced. By analyzing their angular correlation function with a simple space-time model, the time difference between the two scission points in threefold process for Ar+In system were derived. A systematics of P₃₂ versus Z²/A for hot nuclei was observed.

References

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Dai Guangxi, Wu Heyu, Duan Limin, Li Zuyu, He Zhiyong, Luo Qingzheng and Zhang Baoguo. The Threefold Fragmentation of Hot Nuclei With Medium Mass Number[J]. Chinese Physics C, 1996, 20(7): 588-595.

Dai Guangxi, Wu Heyu, Duan Limin, Li Zuyu, He Zhiyong, Luo Qingzheng and Zhang Baoguo. The Threefold Fragmentation of Hot Nuclei With Medium Mass Number[J]. Chinese Physics C, 1996, 20(7): 588-595. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

The Threefold Fragmentation of Hot Nuclei With Medium Mass Number

Corresponding author: Dai Guangxi,

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1996-07-05

Abstract: The threefold fragmentation in hot nuclei with medium mass number has been measured in 25MeV/u ⁴⁰Ar+¹¹⁵In, ¹⁰³Rh,⁹³Nb reactions. The fragments emitted at angles larger than 32°were detected by ten parallel plate position-sensitive avalanche counters (PPAC) with area of 25×20cm² for each. The quantities of total kinetic energy (TKE), the yield ratio of threefold over fission P₃₂, the distributions of fragment mass, velocity and relative angle etc. were obtained. From the mass ratio of the fragment, a simple empirical expression could be deduced. By analyzing their angular correlation function with a simple space-time model, the time difference between the two scission points in threefold process for Ar+In system were derived. A systematics of P₃₂ versus Z²/A for hot nuclei was observed.