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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 544923.0, MPI für Physik / MPI für Physik
Energy and Centrality Dependence of Deuteron and Proton Production in Pb+Pb Collisions at Relativistic Energies
Authors:NA49 Collaboration; Anticic, T.; Eckardt, V.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:69
Start Page:024902
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The transverse mass mt distributions for deuterons and protons are measured in Pb+Pb reactions near
midrapidity and in the range 0 < m_t &#8722; m < 1.0 (1.5) GeV/c^2 for minimum bias collisions at 158A GeV and for
central collisions at 40 and 80 A GeV beam energies. The rapidity density dn/dy, inverse slope parameter T
and mean transverse mass <m_t> derived from m_t distributions as well as the coalescence parameter B_2 are
studied as a function of the incident energy and the collision centrality. The deuteron m_t spectra are signifi-
cantly harder than those of protons, especially in central collisions. The coalescence factor B_2 shows three
systematic trends. First, it decreases strongly with increasing centrality reflecting an enlargement of the deuteron
coalescence volume in central Pb+Pb collisions. Second, it increases with m_t. Finally, B_2 shows an
increase with decreasing incident beam energy even within the SPS energy range. The results are discussed and
compared to the predictions of models that include the collective expansion of the source created in Pb+Pb
Classification / Thesaurus:NA49
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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