Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at energies available at the CERN Large Hadron Collider
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G. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
The production of (anti-) deuteron and (anti-) He-3 nuclei in Pb-Pb
collisions at root sNN = 2.76 TeV has been studied using the ALICE
detector at the LHC. The spectra exhibit a significant hardening with
increasing centrality. Combined blast-wave fits of several particles
support the interpretation that this behavior is caused by an increase
of radial flow. The integrated particle yields are discussed in the
context of coalescence and thermal-statistical model expectations. The
particle ratios,, He-3 / d and He-3 / p, in Pb-Pb collisions are found to
be in agreement with a common chemical freeze-out temperature of T-chem
approximate to 156 MeV. These ratios do not vary with centrality which
is in agreement with the thermal-statistical model. In a coalescence
approach, it excludes models in which nucleus production is proportional
to the particle multiplicity and favors those in which it is
proportional to the particle density instead. In addition, the
observation of 31 anti-tritons in Pb-Pb collisions is reported. For
comparison, the deuteron spectrum in pp collisions at root s = 7 TeV is
also presented. While the p/p ratio is similar in pp and Pb-Pb
collisions, the d/p ratio in pp collisions is found to be lower by a
factor of 2.2 than in Pb-Pb collisions.... Show more Show less