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Deuteron production in central Pb+Pb collisions at 158A GeV
Ist Teil von
Physics letters. B, 2000-07, Vol.486 (1), p.22-28
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2000
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
Experimental results on deuteron emission from central Pb+Pb collisions (
E
beam=158A GeV, fixed target), obtained by NA49 at the CERN SPS accelerator, are presented. The transverse mass
m
t
distribution was measured near mid-rapidity (2.0<
y<2.5) in the range of 0<
m
t
−
m
0<0.9 GeV/
c
2 (0<
p
t
<2.0 GeV/
c) for the 4% most central collisions. An exponential fit gives an inverse slope
T
d
=(450±30) MeV and a yield
dN
d
/
dy=0.34±0.03. The coalescence factor
B
2(
m
t
=
m
0)=(3.5±1.0)·10
−4 GeV
2 and its
m
t
-dependence are determined and discussed in terms of a model that includes the collective expansion of the source created in a collision. The derived Gaussian size parameter
R
G
of the emission volume is consistent with earlier HBT results on the source of pion emission.