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 25×20cm ²for each. The quantities of total kinetic energy ( TKE), the yield ratio of threefold over fission P ₃₂, 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 P ₃₂versus Z ²/ Afor hot nuclei was observed.

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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
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通讯作者:陈斌, bchen63@163.com

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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/u⁴⁰Ar+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 25×20cm²for each. The quantities of total kinetic energy (TKE), the yield ratio of threefold over fissionP₃₂, 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 ofP₃₂versusZ²/Afor hot nuclei was observed.

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The Threefold Fragmentation of Hot Nuclei With Medium Mass Number

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