Chinese Physics C > 2001, Vol. 25 > Issue(11): 1071-1076

Isotope Ratios of Light Charged Particles and Temperature in the Reactions 30MeV/u⁴⁰Ar+^112,124Sn

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

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Abstract：
Coincidence measurements between residues and light charged particles (LCPs) have been made for the reactions 30MeV/u 40Ar+ ^112,124Sn. The LCPs were measured by 11 semi-conduct telescopes from very forward angle to backward angle. The times of flight of the residues were measured by PPACs installed concentrically around the beam at forward angle. The excitation energy of the primary hot nuclei was obtained from the velocity of residues in the frame of incomplete fusion model. The single isotope ratios, as function of observing angle and excitation energy have been studied. The ratio of ³He/ ⁴He and ⁶Li/ ⁷Li increases with angle while that of ⁶He/ ⁴He and ⁸Li/ ⁷Li decreases. The calculation of statistical theory can not reproduce the curve quantitatively, implying the existence of dynamic effect. Isospin effect of the primary hot nuclei on the single isotopic ratios is demonstrated. However, the temperature extracted from double isotope ratios is target independent.

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XIAO Zhi-Gang, WU He-Yu, JIN Gen-Ming, WANG Hong-Wei, HU Rong-Jiang, LIU Yong-Ying, LI Zu-Yu, DUAN Li-Min, ZHANG Bao-Guo, WEI Zhi-Yong, WANG Su-Fang, ZHU Yong-Tai, ZHU Hai-Dong and LU Zhao-Hui. Isotope Ratios of Light Charged Particles and Temperature in the Reactions 30MeV/u ⁴⁰Ar+ ^112,124Sn[J]. Chinese Physics C, 2001, 25(11): 1071-1076.

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Received: 2000-10-08
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

Isotope Ratios of Light Charged Particles and Temperature in the Reactions 30MeV/u⁴⁰Ar+^112,124Sn

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