Isospin Dependence of Rotational Flow

CHEN Lie-Wen; ZHANG Feng-Shou; MING Zhao-Yu; LI Wen-Fei; ZHU Zhi-Yuan

Chinese Physics C> 2001, Vol. 25> Issue(4) : 329-335

Isospin Dependence of Rotational Flow

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

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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.

References

[1]

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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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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

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

Received Date: 2000-04-04

Accepted Date: 1900-01-01

Available Online: 2001-04-05

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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