https://doi.org/10.1140/epja/s10050-023-00932-w
Regular Article –Theoretical Physics
Vorticity in isobar collisions of 
Ru + Ru and 
Zr + Zr at 
= 200 GeV
1
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800, Shanghai, China
2
University of Chinese Academy of Sciences, 100049, Beijing, China
3
ShanghaiTech University, 201800, Shanghai, China
4
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, 200433, Shanghai, China
5
Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, 200438, Shanghai, China
Received:
20
November
2022
Accepted:
23
January
2023
Published online:
23
February
2023
The kinematic vorticity and thermal vorticity are calculated in isobar collisions of 200 GeV Ru + Ru and Zr + Zr with different deformation parameters within the framework of Ultra-relativistic Quantum Molecular Dynamics model (UrQMD), and a little difference of vorticity between Ru + Ru and Zr + Zr collisions is observed. From the ratios of (Zr-Ru)/Ru of vorticity in different deformation cases, it is found that ratios in deformation cases decrease with the increasing of centrality (i.e. more peripheral) but increase in the case without deformation. And an opposite signal is observed for ratios between nuclear collisions with deformation and without deformation. In addition, the effect of deformation parameter 
is discussed and it is found that the larger the deformation of the nuclei has, the higher vorticity the collision system presents in the Zr + Zr collisions. However, it is insensitive in the Ru + Ru collisions.
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