Deuteron production in central Pb plus Pb collisions at 158A GeV

Citation
Sv. Afanasiev et al., Deuteron production in central Pb plus Pb collisions at 158A GeV, PHYS LETT B, 486(1-2), 2000, pp. 22-28
Citations number
49
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
486
Issue
1-2
Year of publication
2000
Pages
22 - 28
Database
ISI
SICI code
0370-2693(20000727)486:1-2<22:DPICPP>2.0.ZU;2-V
Abstract
Experimental results on deuteron emission from central Pb + Pb collisions ( E-beam = 158A GeV, fixed target), obtained by NA49 at the CERN SPS accelera tor, are presented. The transverse mass in, 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 ) GeV2 and its m(t)-dependence are deter-mined and discussed in terms of a model that includes the collective expansion of the source created in a col lision. The derived Gaussian size parameter R-G Of the emission volume is c onsistent with earlier HBT results on the source of pion emission. (C) 2000 Elsevier Science B.V. All rights reserved.