Chinese Physics C > 2001, Vol. 25 > Issue(6): 494-499

Relaxation of Isospin Degree of Freedom in the Reactions³⁶Ar+^112,124Sn at 35MeV/u

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

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Abstract：
Isotope ratios,defined as the yield ratio of two isotopes with the same charge,were analyzed as a function of kinetic energy of outgoing particles at 20° in the reactions of ⁴⁰Ar+ ^112,124Sn and 5°in ³⁶Ar+ ^112,124Sn at incident energy of 35MeV/u. Isotope ratios between the neutron-deficient isotopes and stable isotope increase with kinetic energy,while those between the neutron rich isotopes and stable isotope decrease. This different behavior was observed similar for both ¹¹²Sn and ¹²⁴Sn targets. The isotope ratios show rather obvious target dependence at 20° and little target dependence at 5°. As the outgoing energy getting down,the N/Z ratio of the fragmentation products at 5° diverts gradually from the N/Z ratio of the projectile to that of the system. These observations indicate that the isospin degree of freedom does not reach complete equilibrium in the peripheral or semi-peripheral collision at this bombarding energy.

References

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XIAO Zhi-Gang, WU He-Yu, LI Zu-Yu, JIN Gen-Ming, WANG Hong-Wei, 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. Relaxation of Isospin Degree of Freedom in the Reactions ³⁶Ar+ ^112,124Sn at 35MeV/u[J]. Chinese Physics C, 2001, 25(6): 494-499.

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Received: 2000-05-30
Revised: 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

Relaxation of Isospin Degree of Freedom in the Reactions³⁶Ar+^112,124Sn at 35MeV/u

Corresponding author:XIAO Zhi-Gang,

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

Received Date:2000-05-30

Accepted Date:1900-01-01

Available Online:2001-06-05

Abstract:Isotope ratios,defined as the yield ratio of two isotopes with the same charge,were analyzed as a function of kinetic energy of outgoing particles at 20° in the reactions of⁴⁰Ar+^112,124Sn and 5°in³⁶Ar+^112,124Sn at incident energy of 35MeV/u. Isotope ratios between the neutron-deficient isotopes and stable isotope increase with kinetic energy,while those between the neutron rich isotopes and stable isotope decrease. This different behavior was observed similar for both¹¹²Sn and¹²⁴Sn targets. The isotope ratios show rather obvious target dependence at 20° and little target dependence at 5°. As the outgoing energy getting down,the N/Z ratio of the fragmentation products at 5° diverts gradually from the N/Z ratio of the projectile to that of the system. These observations indicate that the isospin degree of freedom does not reach complete equilibrium in the peripheral or semi-peripheral collision at this bombarding energy.

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Relaxation of Isospin Degree of Freedom in the Reactions³⁶Ar+^112,124Sn at 35MeV/u

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