Pionic freeze-out hypersurfaces in relativistic nucleus-nucleus collisions - INSPIRE

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Pionic freeze-out hypersurfaces in relativistic nucleus-nucleus collisions

D. Anchishkin
(
- BITP, Kiev
)
,
V. Vovchenko
(
- Taras Shevchenko U.
)
,
L.P. Csernai
(
- Bergen U.
)

Nov, 2012

7 pages

Published in:

Phys.Rev.C 87 (2013) 1, 014906

Published: Jan 16, 2013

e-Print:

1211.1927 [nucl-th]

DOI:

10.1103/PhysRevC.87.014906

View in:

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Abstract: (APS)

The space-time structure of the multipion system created in central relativistic heavy-ion collisions is investigated. Using the microscopic transport model UrQMD we determine the freeze-out hypersurface from the equation on pion density n(t,r)=nc. It turns out that for proper value of the critical energy density εc equation ε(t,r)=εc gives the same freeze-out hypersurface. It is shown that for big enough collision energies Ekin≥40A GeV (s≥8A GeV) the multipion system at a time moment τ ceases to be one connected unit but splits up into two separate spatial parts (drops), which move in opposite directions from one another with velocities which approach the speed of light with an increase of collision energy. This time τ is approximately invariant of the collision energy, and the corresponding τ= const. hypersurface can serve as a benchmark for the freeze-out time or the transition time from the hydrostage in hybrid models. The properties of this hypersurface are discussed.

Note:

11 pages, 8 EPS figures, references added, minor changes to match published version

25.75.Ag
25.75.Dw
24.10.Lx
energy: density
pi: density
heavy ion: scattering
freeze-out
quantum molecular dynamics: relativistic
transport theory
space-time

References(13)

Figures(18)

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