Relaxation of Isospin Degree of Freedom in the Reactions 36Ar+112,124Sn at 35MeV/u

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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.
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. shu
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Received: 2000-05-30
Revised: 1900-01-01
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Relaxation of Isospin Degree of Freedom in the Reactions 36Ar+112,124Sn at 35MeV/u

    Corresponding author: XIAO Zhi-Gang,
  • Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China

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°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 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.

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