DOI: 10.1140/epja/i2002-10099-3
Analysing spectra on production of light clusters in heavy-ion collisions and reflections on the average phase space density
Bhaskar De1, S. Bhattacharyya1 and P. Guptaroy21 Physics and Applied Mathematics Unit (PAMU) Indian Statistical Institute, Kolkata - 700108, India
2 Department of Physics, Raghunathpur College, P.O.: Raghunathpur 723133, Dist.: Purulia (WB), India
bhaskar_r@isical.ac.in
bsubrata@isical.ac.in
(Received: 21 May 2002 / Revised version: 1 October 2002 / Published online: 18 February 2003)
Abstract
In the recent past the NA44 Collaboration reported measurements on
production of deuteron spectra in SS , SPb and PbPb
collisions at the CERN-SPS. This has opened up an avenue, within
the confines of the coalescence model, for calculating the
source radii of protons, antiprotons and the average phase space
densities (APSD) which are being projected, of late, as a reliable
observable for studying the freeze-out behaviour of high-energy
nuclear collisions. Instead of the thermal or thermodynamical model,
we have applied in the present work a set of two models with a new
parametrisation which yielded in the past a fair description of
some observations on the APSD nature for pion production in
nuclear collision. The combination provides here a satisfactory
analysis of the
spectra for both proton and deuteron
production and allows us to obtain the values of the hypothesized
radii of the assumed spheres of the expansion dynamics and also of
the average phase space densities for protons. The values thus
arrived at are also quite consistent with the RQMD predictions in
the standard literature.
13.60.Hb - Total and inclusive cross-section (including deep-inelastic processes).
25.75.-q - Relativistic heavy-ion collisions.
© Società Italiana di Fisica, Springer-Verlag 2003
