https://doi.org/10.1140/epja/i2018-12513-7
Regular Article - Experimental Physics
Centrality determination of Au + Au collisions at 1.23A GeV with HADES
1
Institute of Physics, Slovak Academy of Sciences, 84228, Bratislava, Slovakia
2
LIP-Laboratório de Instrumentação e Fısica Experimental de Partıculas, 3004-516, Coimbra, Portugal
3
Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059, Kraków, Poland
4
GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
5
Technische Universität Darmstadt, 64289, Darmstadt, Germany
6
Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314, Dresden, Germany
7
Joint Institute of Nuclear Research, 141980, Dubna, Russia
8
Institut für Kernphysik, Goethe-Universität, 60438, Frankfurt, Germany
9
Excellence Cluster “Origin and Structure of the Universe”, 85748, Garching, Germany
10
Physik Department E62, Technische Universität München, 85748, Garching, Germany
11
II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392, Giessen, Germany
12
Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
13
Institute of Theoretical and Experimental Physics, 117218, Moscow, Russia
14
Department of Physics, University of Cyprus, 1678, Nicosia, Cyprus
15
Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, F-91406, Orsay Cedex, France
16
Nuclear Physics Institute, The Czech Academy of Sciences, 25068, Rez, Czech Republic
17
LabCAF. F. Fısica, Univ. de Santiago de Compostela, 15706, Santiago de Compostela, Spain
* e-mail: hades-info@gsi.de
Received:
23
January
2018
Accepted:
18
April
2018
Published online:
24
May
2018
The centrality determination for Au + Au collisions at 1.23A GeV, as measured with HADES at the GSI-SIS18, is described. In order to extract collision geometry related quantities, such as the average impact parameter or number of participating nucleons, a Glauber Monte Carlo approach is employed. For the application of this model to collisions at this relatively low centre-of-mass energy of GeV special investigations were performed. As a result a well defined procedure to determine centrality classes for ongoing analyses of heavy-ion data is established.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2018