Disappearance of Collective Rotation in Heavy Ion Collisions |
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Authors: | Yu-Gang MA and Wen-Qing SHEN Zhi-Yuan ZHU |
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Institution: | 1. Institute of Nuclear Research, Academia Sinica, P. O. Box 800-204, Shanghai 201800, China;
2. CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, China |
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Abstract: | A theoretical analysis of collective rotation is performed in heavy ion collisions below 100 MeV/nucleon in the quantum molecular dynamics approach. Both methods are contributed to this analysis, one is based on the shapes of azimuthal distribution, and the other is based on the numerical semiclassical calculation of rotation. The collective rotation becomes weaker with the increasing of beam energy, and tends to fade out at a certain beam energy. The impact parameter dependence of collective motion is also discussed. In connection with recent experiments, theoretical results and experimental data are compared by taking into account the fluctuation of experimental reaction plane determination. |
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