Isospin Dependence of Rotational Flow

  • The rotational collective flow in reactions of 58Fe+58Fe and 58Ni+58Ni at 40 MeV/u for different impact parameters was studied within the framework of IQMD model, by analyzing the mid rapidity azimuthal distribution and calculating semi-quantitatively the rotational observables. A strong isospin dependence of rotational collective flow has been found, namely, the more neutron-rich system exhibits stronger rotational collective flow. This isospin dependence is more appreciable in semi-peripheral collisions, and it mainly results from the isospin dependence of N-N cross section and the symmetry energy. Meanwhile, it is indicated that the rotational collective flow depends strongly on the impact parameter, namely, it increases with increment of impact parameter from near central to peripheral collisions and then decreases, finally disappears in the most peripheral collisions.
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CHEN Lie-Wen, ZHANG Feng-Shou, MING Zhao-Yu, LI Wen-Fei and ZHU Zhi-Yuan. Isospin Dependence of Rotational Flow[J]. Chinese Physics C, 2001, 25(4): 329-335.
CHEN Lie-Wen, ZHANG Feng-Shou, MING Zhao-Yu, LI Wen-Fei and ZHU Zhi-Yuan. Isospin Dependence of Rotational Flow[J]. Chinese Physics C, 2001, 25(4): 329-335. shu
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Received: 2000-04-04
Revised: 1900-01-01
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Isospin Dependence of Rotational Flow

    Corresponding author: CHEN Lie-Wen,
  • Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China3 Shanghai Institute of Nuclear Research, Academia Sinica, Shanghai 201800, China4 CCAST World Laboratory, Beijing 100080, China

Abstract: The rotational collective flow in reactions of 58Fe+58Fe and 58Ni+58Ni at 40 MeV/u for different impact parameters was studied within the framework of IQMD model, by analyzing the mid rapidity azimuthal distribution and calculating semi-quantitatively the rotational observables. A strong isospin dependence of rotational collective flow has been found, namely, the more neutron-rich system exhibits stronger rotational collective flow. This isospin dependence is more appreciable in semi-peripheral collisions, and it mainly results from the isospin dependence of N-N cross section and the symmetry energy. Meanwhile, it is indicated that the rotational collective flow depends strongly on the impact parameter, namely, it increases with increment of impact parameter from near central to peripheral collisions and then decreases, finally disappears in the most peripheral collisions.

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