Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u 40Ar+115In,58Ni,27Al

WANG JinChuan; ZHAN WenLong; GUO ZhongYan; XI HongFei; LIU Hang; ZHOU JianQun; ZHAO YouXiong

Chinese Physics C> 2000, Vol. 24> Issue(1) : 41-48

Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u ⁴⁰Ar+¹¹⁵In,⁵⁸Ni,²⁷Al

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

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Abstract：
The angular & Z distributions of foe fragments emitted in the forward and intermediary angles are measured at the reaction of 25 MeV/u ⁴⁰Ar+¹¹⁵In,⁵⁸Ni,²⁷Al. Their characteristics are investigated based on the model of Modified Qantum Molecular Dynamics (MQMD). Generally, the theoretical calculations are in good agreement with the experiment data. But in the forward angles the yield of the fragments is underestimated by MQMD model while in the case of the intermediate angle region, the calculation is higher than the experiment data in some degree for the fragments whose charge numbers are in the vicinity of the proiectile. The angular & charge distributions of the fragments are also compared with the statistical model of GEMINI. The results turn out to be that a small proportion of the statistical evaporation component exists in the forward angles while in the intermediate angle region, this component increases to some extent. However, its ratio is still small. It is found that the equilibrium evaporation component decreases gradually when the Z of the fragments becomes smaller.

References

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WANG JinChuan, ZHAN WenLong, GUO ZhongYan, XI HongFei, LIU Hang, ZHOU JianQun and ZHAO YouXiong. Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u ⁴⁰Ar+¹¹⁵In,⁵⁸Ni,²⁷Al[J]. Chinese Physics C, 2000, 24(1): 41-48.

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Received: 1998-11-25
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沈阳化工大学材料科学与工程学院沈阳 110142

Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u ⁴⁰Ar+¹¹⁵In,⁵⁸Ni,²⁷Al

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Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u ⁴⁰Ar+¹¹⁵In,⁵⁸Ni,²⁷Al

Corresponding author: WANG JinChuan,

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