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.

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HE ZhiYong et al. High Energy Physics and 　Nuclear Physics(in Chinese), 1998, 22(1): 13(贺智勇等.高能物理与核物理,1998,22(1):13)2 QIAN Xing et al. High Energy Phys. and Nucl. Phys. (in Chinese), 1996, 20(4):304(钱兴等.高能物理与核物理,1996,20(4):304) 3 JIANG DongXing et al. Chinese Journal of Nucl. Phys., 1995, 17:223 4 LI ZuYu et al. High Energy Phys. and Nucl. Phys. (in Chinese), 1999, 23(8):753(李祖玉等.高能物理与核物理,1999,23(8):753)5 LIN YuanGen et al. Acta Physica Sinica (in Chinese), 1998, 47:564(林源根等.物理学报,1998,47:564)6 WANG JinChuan et al. Investigation of Fragment Emission at the Forward and intermediate Angles in the Reaction of 25MeV / u 4o Ar +,115 In, Acta Physica Sinica (in Chinese), to be Published(王金川等.25MeV/u40　Ar+115　In反应中前中角区碎片发射研究,物理学报,待发表)7 Hartnack Ch et al. Eur. Phys. J., 1998, Al: 151 8 ZHAO YouXiong et al. NuCl. Instr. Meth., 1995, A355:464 9 GUO ZhongYan et al. High Energy Physics and Nuclear Physics, 1995, 19(4):333 10 WANG JinChuan et al. Nucl. Instr. Meth., 1996, A368:47311 LIU hang et al. Z. Phys., 1996, A354:3ll12 Aichelin J. Phys. Rep., 1991, 202:233 13 Ngo C et al. Nucl. Phys., 1989, A499:148 14 Kanada–Enyo Yoshiko. KUNS, 1991, 1271 15 Horiuchi H. Symp. On Heavy ion Phys. and APPlication, Lanzhou, China Oct. 1990, 25. 16 WANG JinChuan et al. The Dynamical Aspects of the Fragments in the Reaction of 4o Ar+ 58 Ni at Intermediate Energy Region, Science in China (Series A, in Chinese), to be published(王金川等.中能区40Ar+58Ni反应的碎片动力学性质研究,中国科学(A辑),待发表)17 Wada R et al. Reaction Mechanism in Fend Energy Domain. In: Pripring of Cyclotron Institute, Texas A M Univ. No. 96–05. 1996. 1–518 Jolinston H et al. COmparison of Z Distributions From the Reaction 4oCa + 58 Fe at E / A = 33, 45 MeVWith the Prediction Made by QMD, BUU/ GEMINI. In: Cyclotron Institute Texas AM Univ. Ed. Progressin Researeh. Texas: 1996. 44–4619 SA BenHao et al. Phys. Rev., 1993, C48:628 20 Bass R. Phys. Rev. Lett., 1977, 39:265

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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
Revised: 1900-01-01

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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,

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

Received Date: 1998-11-25
Accepted Date: 1900-01-01
Available Online: 2000-01-05

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.

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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

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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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