Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u <SUP>40</SUP>Ar+<SUP>112,124</SUP>Sn

XIAO Zhi-Gang; WU He-Yu; WANG Hong-Wei; LI Zu-Yu; JIN Gen-Ming; DUAN Li-Min; ZHANG Bao-Guo; HU Rong-Jiang; WEI Zhi-Yong; LIU Yong-Ying; WANG Su-Fang; LU Zhao-Hui; ZHU Yong-Tai; ZHU Hai-Dong

Chinese Physics C> 2001, Vol. 25> Issue(7) : 643-650

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn

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

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Abstract：
The coincidence measurements between residues and light particles have been carried out for the reactions 30MeV/u ⁴⁰Ar+^112,124Sn. The times of flight of the residues are measured by PPACs installed concentrically around the beam at forward angle. The spectra of ³He,α and ⁶He detected at backward angle in coincidence with residues having different average velocities are analyzed with moving source fit. The average excitation energy of hot nuclei is obtained in the incomplete fusion frame. It is shown that the slope temperature extracted from ³He(⁶He) spectra is higher (lower) in the neutron-rich system ⁴⁰Ar+ ¹²⁴Sn than that in the neutron-deficient system ⁴⁰Ar+¹¹²Sn. For α particle. there is almost no difference between the two reaction systems. The possible causality of these systematic behaviors is discussed from the selectivity of the emitting particles along the decay chain of hot nuclei. The calculation of GEMINI can not repsoduce the experimental observations.

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XIAO Zhi-Gang, WU He-Yu, WANG Hong-Wei, LI Zu-Yu, JIN Gen-Ming, DUAN Li-Min, ZHANG Bao-Guo, HU Rong-Jiang, WEI Zhi-Yong, LIU Yong-Ying, WANG Su-Fang, LU Zhao-Hui, ZHU Yong-Tai and ZHU Hai-Dong. Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn[J]. Chinese Physics C, 2001, 25(7): 643-650.

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Received: 2000-07-26
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

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn

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Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn

Corresponding author: XIAO Zhi-Gang,

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Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u 40Ar+112,124Sn

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通讯作者: 陈斌, bchen63@163.com

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Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u 40Ar+112,124Sn

Corresponding author: XIAO Zhi-Gang,

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Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+^112,124Sn