Systematic investigation of azimuthal anisotropy in Au+Au and U+U collisions at sNN=200GeV. (12th July 2019)

• Record Type: Journal Article
• Authors: Haque, Md Rihan; Nasim, Md; Mohanty, Bedangadas
• Is Part Of: Journal of physics. Volume 46:Number 8(2019:Aug.)
• Publication Date: 2019-07-12
• Subjects: collectivity -- heavy-ion collisions -- elliptic flow; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ab2ba4
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: We present a study of azimuthal anisotropy parameter ( v 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 ( v 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 ( v 3, v 4, and v 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 v 2 / ϵ 2 is higher (similar) in Au+Au collisions compared to deformed (spherical) U+U collisions at most central collisions. However, we believe v 2 / ϵ 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 ( ϵ 2 ) scaled v 2 may not reflect true collectivity. On the other hand, magnitudes of v 3 / ϵ 3, v 4 / ϵ 4 and v 5 / ϵ 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.