Isospin Dynamics and Dipolar degrees of freedom in Heavy Ion collisions

Massimo Papa; Concettina Maiolino; Luis Acosta; Giuseppe Cardella; Enrico De Filippo; Elena Geraci; Brunilde Gnoffo; Chiara Guazzoni; Nunzia Martorana; Angelo Pagano; Emanuele Vincenzo Pagano; Sara Pirrone; Giuseppe Politi; Lucia Quattrocchi; Fabio Risitano; Francesca Rizzo; Paolo Russotto; Marina Trimarchi; Cristina Zagami

doi:10.1051/epjconf/202430102007

All issues

Volume 301 (2024)

EPJ Web Conf., 301 (2024) 02007

Abstract

Open Access

Issue		EPJ Web Conf. Volume 301, 2024 XLV Symposium on Nuclear Physics 2024


Article Number		02007
Number of page(s)		9
Section		Nuclear Structure and Reactions
DOI		https://doi.org/10.1051/epjconf/202430102007
Published online		07 August 2024

EPJ Web of Conferences 301, 02007 (2024)
https://doi.org/10.1051/epjconf/202430102007

Isospin Dynamics and Dipolar degrees of freedom in Heavy Ion collisions

Massimo Papa¹^*, Concettina Maiolino², Luis Acosta³, Giuseppe Cardella¹, Enrico De Filippo¹, Elena Geraci⁴^,1, Brunilde Gnoffo¹, Chiara Guazzoni⁵, Nunzia Martorana⁴^,2, Angelo Pagano¹, Emanuele Vincenzo Pagano², Sara Pirrone¹, Giuseppe Politi⁴^,1, Lucia Quattrocchi⁶, Fabio Risitano⁶^,2, Francesca Rizzo⁴^,2, Paolo Russotto², Marina Trimarchi⁶^,1 and Cristina Zagami⁷^,4^,2

¹ INFN, Sezione di Catania, Italy
² INFN, Laboratori Nazionali del Sud - Catania, Italy
³ Instituto de Física. Universidad Nacional Autónoma de México, Mexico, Instituto de Estructura de la Materia, CSIC, Spain.
⁴ Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, Italy
⁵ Dipartimento di Elettronica Informazione e Bioingegneria Politecnico Milano and INFN Sez. Milano, Milano, Italy
⁶ Dipartimento di Scienze MIFT, Univ. di Messina, Messina, Italy
⁷ CSFNSM-Centro Siciliano di Fisica Nucleare e Struttura della Materia, Catania, Italy

^* e-mail: Massimo.Papa@ct.infn.it

Published online: 7 August 2024

Abstract

In this contribution the connection between the Dipolar degree of freedom excited in Heavy Ion Collisions through pre-equilibrium dipolar modes and the Isospin-equilibration processes is discussed. The connection leads to the definition of a new observable the so called “dipolar signal”, able to describe the equilibration process in the momentum space related to the final fragmentation produced by the HIC. Preliminary results on this observable measured on the system ⁴⁸Ca +²⁷ Al at 40 MeV/nucleon and corresponding to different degrees of dissipation/centrality are presented. The beam was accelerated through the Superconductor Cyclotron at the Laboratori Nazionali del Sud di Catania (Italy) and fragments were detected and identified with the 4π multi-detector CHIMERA.

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