Model-independent measurement of isospin diffusion in Ni-Ni systems at intermediate energy

作     者：Ciampi, C. Frankland, J.D. Gruyer, D. Neindre, N. Le Mallik, S. Bougault, R. Chbihi, A. Baldesi, L. Barlini, S. Bonnet, E. Borderie, B. Camaiani, A. Casini, G. Dekhissi, I. Dell’Aquila, D. Dueñas, J.A. Fable, Q. Gramegna, F. Gouyet, C. Henri, M. Hong, B. Kim, S. Kordyasz, A. Kozik, T. Kweon, M.J. Lombardo, I. Lopez, O. Manduci, L. Marchi, T. Mazurek, K. Nam, S.H. Park, J. Pârlog, M. Pasquali, G. Piantelli, S. Poggi, G. Rebillard-Soulié, A. Revenko, R. Valdré, S. Verde, G. Vient, E. 

作者机构： CEA/DRF CNRS IN2P3 Boulevard Henri Becquerel CaenF-14076 France Université de Caen Normandie ENSICAEN CNRS IN2P3 LPC Caen UMR6534 CaenF-14000 France Physics Group Variable Energy Cyclotron Centre 1/AF Bidhan Nagar Kolkata700064 India INFN - Sezione di Firenze Sesto Fiorentino50019 Italy Dipartimento di Fisica e Astronomia Università di Firenze Sesto Fiorentino50019 Italy SUBATECH UMR 6457 IMT Atlantique Université de Nantes CNRS-IN2P3 NantesF-44300 France Université Paris-Saclay CNRS IN2P3 IJCLab Orsay91405 France Dipartimento di Fisica "Ettore Pancini" University of Napoli Federico II Napoli80126 Italy INFN - Sezione di Napoli Napoli80126 Italy Departamento de Ingeniería Eléctrica y Centro de Estudios Avanzados en Física Matemáticas y Computación Universidad de Huelva Huelva21007 Spain INFN - Laboratori Nazionali di Legnaro Legnaro35020 Italy CEA/INSTN UECC 143 Chemin de la Crespinière – ZA Les Vindits Cherbourg en CotentinF-50130 France  Korea University Seoul02841 Korea Republic of Department of Physics Korea University Seoul02841 Korea Republic of Center for Exotic Nuclear Studies Institute for Basic Science Daejeon34126 Korea Republic of Heavy Ion Laboratory University of Warsaw Warszawa02-093 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University S. Lojasiewicza 11 Krakow30-348 Poland Department of Physics Inha University Incheon22212 Korea Republic of INFN - Sezione di Catania Catania95123 Italy Dipartimento di Fisica e Astronomia Università di Catania via S. Sofia 64 Catania95123 Italy  BP 19 Armées CherbourgF-50115 France Institute of Nuclear Physics Polish Academy of Sciences KrakowPL-31342 Poland  P. O. Box MG-6 Magurele Bucharest Romania  Université de Toulouse CNRS UPS ToulouseF-31062 Cedex 9 France 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Gallium nitride 

摘      要：In this work we provide a model-independent experimental evaluation of the degree of isospin equilibration taking place in 58,64Ni+58,64Ni collisions at 32 MeV/nucleon across varying reaction centralities. This result has been obtained by combining the complementary information provided by two different datasets, sharing common characteristics. The first dataset has been acquired with the INDRA setup and has been used to implement a model-independent reconstruction of the impact parameter. The second dataset has been acquired in the first experimental campaign of the coupled INDRA-FAZIA apparatus at GANIL. The neutron-to-proton content of the quasiprojectile remnant measured by FAZIA has been employed as isospin observable. The effect of isospin diffusion has been evidenced by means of the isospin transport ratio, reported as a function of the impact parameter of the collision. The evolution towards isospin equilibration from semiperipheral to more central collisions is clearly extracted. This experimental result, expanding our previous works (Phys. Rev. C 106, 024603 (2022) and Phys. Rev. C 108, 054611 (2023)), can be compared with the predictions of any transport model, and can thus be used to set constraints on the behavior of the symmetry energy term of the nuclear Equation of State at sub- to saturation densities. Copyright © 2024, The Authors. All rights reserved.