https://doi.org/10.1140/epja/s10050-022-00851-2
Regular Article - Experimental Physics
Isoscaling in central Sn+Sn collisions at 270 MeV/u
1 Department of Physics, Korea University, 02841, Seoul, Republic of Korea
2 Facility for Rare Isotope Beams, Michigan State University, 48824, East Lansing, MI, USA
3 Department of Physics and Astronomy, Michigan State University, 48824, East Lansing, MI, USA
4 RIKEN Nishina Center, Hirosawa 2-1, 351-0198, Saitama, Wako, Japan
5 Department of Physics, Kyoto University, Kita-shirakawa, 606-8502, Kyoto, Japan
6 Department of Physics, Tohoku University, 980-8578, Sendai, Japan
7 Instituto de Física, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco A, 21941-909, Rio de Janeiro, Rio de Janeiro, Brazil
8 Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais UFMG, Av. Presidente Antônio Carlos 6.627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
9 Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany
10 GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291, Darmstadt, Germany
11 Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Kraków, Poland
12 Division of Experimental Physics, Rudjer Boskovic Institute, Zagreb, Croatia
13 Department of Physics, Rikkyo University, Nishi-Ikebukuro 3-34-1, 171-8501, Tokyo, Japan
14 Department of Life and Environmental Agricultural Sciences, Tottori University, 680-8551, Tottori, Japan
15 Rare Isotope Science Project, Institute for Basic Science, 34047, Daejeon, Republic of Korea
16 Department of Physics, Tokyo Institute of Technology, 152-8551, Tokyo, Japan
17 Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, 31-342, Kraków, Poland
18 Cyclotron Institute, Texas A &M University, 77843, College Station, TX, USA
19 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
20 Department of Physics, Tsinghua University, 100084, Beijing, People’s Republic of China
21 Department of Chemistry, Texas A &M University, 77843, College Station, TX, USA
Received:
12
June
2022
Accepted:
7
October
2022
Published online: 21 October 2022
Experimental information on fragment emissions is important in understanding the dynamics of nuclear collisions and in the development of transport model simulating heavy-ion collisions. The composition of complex fragments emitted in the heavy-ion collisions can be explained by statistical models, which assume that thermal equilibrium is achieved at collision energies below 100 MeV/u. Our new experimental data together with theoretical analyses for light particles from Sn+Sn collisions at 270 MeV/u, suggest that the hypothesis of thermal equilibrium breaks down for particles emitted with high transfer momentum. To inspect the system’s properties in such limit, the scaling features of the yield ratios of particles from two systems, a neutron-rich system of 
and a nearly symmetric system of 
, are examined in the framework of the statistical multifragmentation model and the antisymmetrized molecular dynamics model. The isoscaling from low energy particles agree with both models. However the observed breakdown of isoscaling for particles with high transverse momentum cannot be explained by the antisymmetrized molecular dynamics model.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
