Systematic investigation of azimuthal anisotropy in Au plus Au and U plus U collisions at √sNN=200 GeV

被引：19
|
作者：
Haque, Md Rihan [1 ]
Nasim, Md [2 ]
Mohanty, Bedangadas [3 ,4 ]
机构：
[1] Univ Utrecht, POB 80000, NL-3508 TA Utrecht, Netherlands
[2] Indian Inst Sci Educ & Res, Dept Phys, Berhampur 760010, Orissa, India
[3] HBNI, Natl Inst Sci Educ & Res, Sch Phys Sci, Jatni 752050, India
[4] Expt Phys Dept, CERN, CH-1211 Geneva 23, Switzerland
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2019年 / 46卷 / 08期
关键词：
collectivity; heavy-ion collisions; elliptic flow; QUARK-GLUON PLASMA; ELLIPTIC FLOW; PERSPECTIVE; SIGNATURE; SPS;
D O I：
10.1088/1361-6471/ab2ba4
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We present a study of azimuthal anisotropy parameter (nu(n)) of produced particles in Au+Au and U+U collisions at top RHIC collision energy. The U+U collisions have been studied with and without including the deformed shape of the uranium nuclei. For this purpose, we have used a multi-phase transport (AMPT) model that includes the implementation of deformed uranium nuclei. It is found that the elliptic flow (nu(2)) is higher in central U+U collisions with deformed uranium nuclei compared to Au+Au and spherical U+U. On the other hand, other higher harmonics (nu(3), nu(4), and nu(5)) are found to be almost similar in magnitude for all three systems (Au+Au, deformed U+U, and spherical U+U). We have shown that the magnitude of nu(2)/epsilon(2) is higher (similar) in Au+Au collisions compared to deformed (spherical) U+U collisions at most central collisions. However, we believe nu(2)/epsilon(2) reflect true collectivity and more collectivity is expected in large nuclei (U-235) compared to the small Au-197 nucleus. This indicates that in the case of deformed nuclei, eccentricity (epsilon(2)) scaled nu(2) may not reflect true collectivity. On the other hand, magnitudes of nu(3)/epsilon(3), nu(4)/epsilon(4) and nu(5)/epsilon(5) for a given centrality are the same for Au+Au, deformed U+U, and spherical U+U collisions. These are interesting observations and can be checked in experimental data at RHIC. We have also compared Au+Au and U+U results with that of Cu+Cu for a better understanding of our findings.
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页数：10
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