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Nuclear neck-density determination at Fermi energy with CHIMERA detector

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Abstract

Binary collisions of either stable or radioactive heavy ions at Fermi energies allow to study the nuclear reaction mechanisms under dynamical conditions of non-equilibrium and the formation of transient pieces of nuclear matter of very short mean life times at sub-normal density. An important role in the evolutionary phase of the collision is played by the gradient of the nuclear density affecting the isospin asymmetry of the reaction products by typical transport phenomena such as the isospin diffusion and drift. Experimental determination of the value of the nuclear matter density in the early phase of the collision is a crucial step towards understanding the underlying mechanism responsible for the production of clusters. In this paper a method for evaluating the nuclear density in semi-peripheral collisions in the reaction \(^{124}Sn + ^{64}Ni\) at 35 MeV/nucleon as studied with the CHIMERA multi-particle detector is described.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data generated during this study are contained in this published article].

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Acknowledgements

One of us (A.P.) is grateful to Ivano Lombardo from INFN Sezione di Catania for useful discussions about cluster formations. The authors are grateful to the referees for the careful reading of the manuscript and to Jerzy Lukasik for checking the numerical evaluations by an independent analysis performed on a class of the same experimental data, allowing us to remove some numerical discrepancies detected in a previous version of the draft.

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Authors and Affiliations

  1. INFN-Sezione di Catania, Via S. Sofia, 64, Catania, Italy

    A. Pagano, E. De Filippo, E. Geraci, L. Acosta, L. Auditore, G. Cardella, B. Gnoffo, F. Favela, M. Papa, S. Pirrone, G. Politi, L. Quattrocchi, A. Trifirò & M. Trimarchi

  2. INFN-Laboratori Nazionali del Sud, Via S. Sofia, 62, Catania, Italy

    E. V. Pagano, P. Russotto, M. Colonna, G. Lanzalone, C. Maiolino, N. S. Martorana & F. Rizzo

  3. Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Via S. Sofia, 64, Catania, Italy

    E. Geraci, B. Gnoffo, N. S. Martorana, G. Politi & F. Rizzo

  4. Faculty of Physics, University of Warsaw, Warsaw, Poland

    K. Siwek-Wilczyńska

  5. Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland

    E. Piasecki

  6. National Center for Nuclear Research, Otwock-Świerk, Poland

    T. Cap

  7. Saha Institute of Nuclear Physics, Kolkata, India

    M. B. Chatterjee

  8. Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy

    L. Auditore, L. Quattrocchi, A. Trifirò & M. Trimarchi

  9. Facoltà di Ingegneria e Architettura, Università Kore, Enna, Italy

    G. Lanzalone

  10. Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico

    L. Acosta

  11. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico

    F. Favela

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  1. A. Pagano
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Correspondence to A. Pagano.

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Communicated by Nicolas Alamanos.

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Pagano, A., De Filippo, E., Geraci, E. et al. Nuclear neck-density determination at Fermi energy with CHIMERA detector. Eur. Phys. J. A 56, 102 (2020). https://doi.org/10.1140/epja/s10050-020-00105-z

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