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

In this work we provide a model-independent experimental evaluation of the degree of isospin equilibration taking place in $^{58,64}\mathrm{Ni}+^{58,64}\mathrm{Ni}$ 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 toward 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.

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Publication Details

Journal
Physical review. C
Published
2025-04-01
DOI
https://doi.org/10.1103/physrevc.111.044601
Citations
2
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
3.74

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article

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

F. Gramegna, B. Borderie, J. A. Dueñas, G. Casini et al.
2 citations
Physical review. C
Nuclear physics research studies
3.74
article

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

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

Abstract

In this work we provide a model-independent experimental evaluation of the degree of isospin equilibration taking place in $^{58,64}\mathrm{Ni}+^{58,64}\mathrm{Ni}$ 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 toward 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.

Physical review. CVol. 111(4)
Jagiellonian University (PL), Variable Energy Cyclotron Centre (IN), Centre National de la Recherche Scientifique (FR), Université Fédérale de Toulouse Midi-Pyrénées (FR), Inha University (KR), École Nationale Supérieure d'Ingénieurs de Caen (FR), Homi Bhabha National Institute (IN), Université Paris-Saclay (FR), University of Catania (IT), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Institute for Basic Science (KR), Normandie Université (FR), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Laboratoire de Physique Corpusculaire de Caen (FR), Direction de la Recherche Fondamentale (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (IT), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Grand Accélérateur National d'Ions Lourds (FR), University of Florence (IT), University of Warsaw (PL), Universidad de Huelva (ES), Nantes Université (FR), Université de Caen Normandie (FR)
National Research Foundation, National Research Foundation of Korea, Région Normandie
Affordable and clean energy
Openalex Percentile: Top 10%
Nuclear physics research studies
3.74
DOIOpen Access PDFOpenAlex
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