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Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions

Publication ,  Journal Article
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Al-Bataineh, H; Al-Ta'ani, H; Alexander, J; Alfred, M; Angerami, A ...
October 9, 2014

Two-pion interferometry measurements are used to extract the Gaussian radii $R_{{\rm out}}$, $R_{{\rm side}}$, and $R_{{\rm long}}$, of the pion emission sources produced in Cu$+$Cu and Au$+$Au collisions at several beam collision energies $\sqrt{s_{_{NN}}}$ at PHENIX. The extracted radii, which are compared to recent STAR and ALICE data, show characteristic scaling patterns as a function of the initial transverse size $\bar{R}$ of the collision systems and the transverse mass $m_T$ of the emitted pion pairs, consistent with hydrodynamiclike expansion. Specific combinations of the three-dimensional radii that are sensitive to the medium expansion velocity and lifetime, and the pion emission time duration show nonmonotonic $\sqrt{s_{_{NN}}}$ dependencies. The nonmonotonic behaviors exhibited by these quantities point to a softening of the equation of state that may coincide with the critical end point in the phase diagram for nuclear matter.

Duke Scholars

Publication Date

October 9, 2014
 

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Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., … Sexton, A. (2014). Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions.
Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Bataineh, et al. “Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions,” October 9, 2014.
Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R, et al. Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions. 2014 Oct 9;
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Beam-energy and system-size dependence of the space-time extent of the pion emission source produced in heavy ion collisions. 2014 Oct 9;

Publication Date

October 9, 2014