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1. Measurement of nuclear interaction cross sections towards neutron-skin thickness determination

Author

L. Ponnath, T. Aumann, C.A. Bertulani, R. Gernhäuser, M. Heil, T. Almusidi, H. Alvarez-Pol, L. Atar, L. Atkins, Y. Ayyad, J. Benlliure, K. Boretzky, M.J.G. Borge, L.T. Bott, G. Bruni, B. Brückner, P. Cabanelas, C. Caesar, E. Casarejos, J. Cederkall, A. Corsi, D. Cortina-Gil, J.A. Dueñas, M. Duer, Z. Elekes, S. Escribano Rodriguez, L. Fabbietti, A. Falduto, M. Feijoo, M. Feijoo Fontan, L.M. Fonseca, A. Frotscher, D. Galaviz, E. Galiana, G. García-Jiménez, I. Gašparic̀, E.I. Geraci, A. Gillibert, B. Gnoffo, D. González Caamaño, A. Graña González, K. Göbel, A.-L. Hartig, A. Heinz, T. Hensel, M. Holl, A. Horvat, A. Jedele, D. Jelavic̀ Malenica, T. Jenegger, H.T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, A. Kelic-Heil, O.A. Kiselev, P. Klenze, D. Kresan, T. Kröll, E. Kudaibergenova, D. Kurtulgil, D. Körper, M. Labiche, C. Langer, I. Lihtar, Yu.A. Litvinov, B. Löher, J. Mayer, S. Murillo Morales, E. Nacher, T. Nilsson, A. Obertelli, V. Panin, J. Park, S. Paschalis, A. Perea, M. Petri, S. Pirrone, T. Pohl, R. Reifarth, H.-B. Rhee, J.L. Rodriguez-Sanchez, L. Rose, D.M. Rossi, P. Russotto, D. Savran, H. Scheit, H. Simon, S. Storck-Dutine, A.M. Stott, C. Sürder, R. Taniuchi, O. Tengblad, P. Teubig, L. Trache, M. Trimarchi, H.T. Törnqvist, L. Varga, V. Wagner, and F. Wamers

Subjects
Physics, QC1-999
Abstract

The accuracy of reaction theories used to extract properties of exotic nuclei from scattering experiments is often unknown or not quantified, but of utmost importance when, e.g., constraining the equation of state of asymmetric nuclear matter from observables as the neutron-skin thickness. In order to test the Glauber multiple-scattering model, the total interaction cross section of Image 1 on carbon targets was measured at initial beam energies of 400, 550, 650, 800, and 1000 MeV/nucleon. The measurements were performed during the first experiment of the newly constructed R3B (Reaction with Relativistic Radioactive Beams) experiment after the start of FAIR Phase-0 at the GSI/FAIR facility with beam energies of 400, 550, 650, 800, and 1000 MeV/nucleon. The combination of the large-acceptance dipole magnet GLAD and a newly designed and highly efficient Time-of-Flight detector enabled a precise transmission measurement with several target thicknesses for each initial beam energy with an experimental uncertainty of ±0.4%. A comparison with the Glauber model revealed a discrepancy of around 3.1% at higher beam energies, which will serve as a crucial baseline for the model-dependent uncertainty in future fragmentation experiments.

Published
2024
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2. NArCoS: The new hodoscope for neutrons and charged particles

Author

E. V. Pagano, E. De Filippo, P. Russotto, G. Cardella, A. Castoldi, E. Geraci, B. Gnoffo, C. Guazzoni, G. Lanzalone, C. Maiolino, N. S. Martorana, A. Pagano, S. Pirrone, G. Politi, F. Risitano, F. Rizzo, and M. Trimarchi

Subjects
neutron detector, correlations, plastic scintillator, charged particle detector, SiPM, Physics, QC1-999
Abstract

Proper detection of neutrons and charged particles is motivated by the recent efforts to construct new facilities for radioactive ion beams (RIBs) worldwide. Detection of neutrons is an important opportunity to improve our understanding of nuclear spectroscopy and reaction dynamics, with the possibility of constraining theoretical models of the nuclear equation of state (NEoS) and investigating in-medium nuclear interactions. This topic also has important implications in the study of astrophysical objects, such as neutron stars. In this work, the state-of-the-art of Neutron Array for Correlation Studies (NArCoS), a new hodoscope for neutron and charged particles under construction in Catania (INFN), is briefly reviewed.

Published
2023
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3. Clustering and molecular states in neutron rich nuclei

Author

B. Gnoffo, S. Pirrone, G. Politi, G. Cardella, E. De Filippo, E. Geraci, C. Maiolino, N. S. Martorana, A. Pagano, E. V. Pagano, M. Papa, F. Risitano, F. Rizzo, P. Russotto, and M. Trimarchi

Subjects
clusters, molecular states, break-up reactions, light nuclei, neutron detection, Physics, QC1-999
Abstract

An investigation plan of different clustering and molecular states in neutron rich isotopes of Lithium, Beryllium, Boron and Carbon, in the context of an experimental campaign at INFN-Laboratori Nazionali del Sud, is presented. High statistics and new information on known states and study on new states will be possible thanks to the high intensities available for the exotic beams, delivered by the FRAISE facility and thanks to the opportunity of using very performing experimental apparatus, as well as the detectors CHIMERA, FARCOS, and NArCOS. Among these, the new hodoscope NArCOS, by detecting with high efficiency neutrons and providing high energy and angular resolutions, will allow also a precise study of reaction channels characterized by neutron emission.

Published
2022
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4. Radioactive ion beam opportunities at the new FRAISE facility of INFN-LNS

Author

N. S. Martorana, G. Cardella, C. Guazzoni, E. V. Pagano, A. D. Russo, P. Russotto, L. Acosta, A. Amato, L. Calabretta, A. Caruso, S. Cavallaro, L. Cosentino, M. Costa, E. De Filippo, G. De Luca, E. Geraci, B. Gnoffo, C. Maiolino, S. Passarello, S. Pirrone, G. Politi, S. Pulvirenti, F. Risitano, F. Rizzo, D. Santonocito, A. Trifiró, M. Trimarchi, S. Tudisco, and G. Vecchio

Subjects
RIBs, FRAISE, unstable nuclei, in-flight technique, SiC, Physics, QC1-999
Abstract

At the Laboratori Nazionali del Sud of INFN (INFN-LNS) in Catania, the construction of the new Radioactive Ion Beams (RIBs) facility FRAISE (FRAgment In-flight SEparator) has reached its ending phase. The facility uses the in-flight technique based on a primary beam fragmentation impinging on light Be or C targets. FRAISE makes use of light and medium mass primary beams, having power up to ≈ 2–3 kW, leading to RIBs, whose intensities vary in the range of ≈ 103–107 pps, for nuclei far from and close to the stability valley, respectively. FRAISE aims at providing high-intensity and high-quality RIBs for nuclear physics experiments, also serving to interdisciplinary research areas, such as medical physics. Critical aspects for high-quality beams are the tuning and transport, representing time-consuming processes and requiring dedicated diagnostics and tagging devices measuring many features of RIBs. Some of these devices should be capable to operate in radioactively activated environments because of the expected 2 kW beam lost in the dipole after the production target. Due to its peculiar robustness to radioactive damage, Silicon Carbide (SiC) technology has been considered for the detection layer. In this view, an R&D campaign has been started aiming at developing the FRAISE facility, the new diagnostics system, and a new tagging device, the latter of which will be useful for the CHIMERA multidetector beamline. In this paper, we discuss the status and the perspectives of the facility with a focus on the RIBs opportunities.

Published
2022
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5. Characteristic time scale of cluster production at the Fermi energy

Author

A. Pagano, G. Cardella, E. De Filippo, E. Geraci, B. Gnoffo, G. Lanzalone, C. Maiolino, N. S. Martorana, E. V. Pagano, S. Pirrone, G. Politi, F. Risitano, F. Rizzo, P. Russotto, A. Trifirò, and M. Trimarchi

Subjects
multifragmentation, nuclear density, clusters, neutron enrichment, Fermi energy, Physics, QC1-999
Abstract

The study of heavy-ion collisions in the Fermi energy domain (20 MeV/nucleon < E/A < 100 MeV/nucleon) is a fundamental research topic in modern nuclear physics. In the case of semi-peripheral collisions, the Fermi energy regime is characterized by the formation of a transient, neck-like structure that connects a projectile-like fragment (PLF) with a target-like fragment (TLF). The neck structure represents a precursor of the fireball which is a typical overlap of participating nucleons at relativistic energies (E/A> 200 MeV/nucleon). It undergoes an expansion phase in a short time scale of the order of 100 fm/c with the formation of a low-density region of nuclear matter, therefore favoring the clusterization of intermediate mass fragments (IMFs) of atomic number Z (typically) less than 20. Particular emphasis is given to some relevant results obtained by the CHIMERA collaboration in the last decade, regarding the time scale of the production mechanisms of the intermediate mass fragments in neck fragmentation and their neutron enrichment.

Published
2022
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6. First measurement of the isoscalar excitation above the neutron emission threshold of the Pygmy Dipole Resonance in 68Ni

Author

N.S. Martorana, G. Cardella, E.G. Lanza, L. Acosta, M.V. Andrés, L. Auditore, F. Catara, E. De Filippo, S. De Luca, D. Dell' Aquila, B. Gnoffo, G. Lanzalone, I. Lombardo, C. Maiolino, S. Norella, A. Pagano, E.V. Pagano, M. Papa, S. Pirrone, G. Politi, L. Quattrocchi, F. Rizzo, P. Russotto, D. Santonocito, A. Trifirò, M. Trimarchi, M. Vigilante, and A. Vitturi

Subjects
Physics, QC1-999
Abstract

The excitation of the Pygmy Dipole Resonance (PDR) in the 68Ni nucleus, above the neutron emission threshold, via an isoscalar probe has been observed for the first time. The excitation has been produced in reactions where a 68Ni beam, obtained by the fragmentation of a 70Zn primary beam at INFN-LNS, impinged on a 12C target. The γ-ray decay was detected using the CsI(Tl) detectors of the CHIMERA multidetector sphere. The 68Ni isotope as well as other heavy ion fragments were detected using the FARCOS array. The population of the PDR was evidenced by comparing the detected γ-ray energy spectra with statistical code calculations. The isotopic resolution of the detection system allows also to directly compare neutron decay channels with the 68Ni channel, better evidencing the PDR decay response function. This comparison allows also the extraction of the PDR cross section and the relative γ-ray angular distribution. The measured γ-ray angular distribution confirms the E1 character of the transition. The γ decay cross section for the excitation of the PDR was measured to be 0.32 mb with a 18% of statistical error. Keywords: Pygmy Dipole Resonance, Unstable nuclei, Isoscalar probe

Published
2018
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7. Mapping the demise of collective motion in nuclei at high excitation energy

Author

D. Santonocito, Y. Blumenfeld, C. Maiolino, C. Agodi, R. Alba, G. Bellia, R. Coniglione, A. Del Zoppo, F. Hongmei, E. Migneco, P. Piattelli, P. Sapienza, L. Auditore, G. Cardella, E. De Filippo, E. La Guidara, C. Monrozeau, M. Papa, S. Pirrone, F. Rizzo, A. Trifiró, M. Trimarchi, H.X. Huang, and O. Wieland

Subjects
Physics, QC1-999
Abstract

High energy gamma-rays from the 116Sn + 24Mg reaction at 23A MeV were measured using the MEDEA detector at LNS – INFN Catania. Combining this new data with previous measurements yields a detailed view of the quenching of the Giant Dipole Resonance as a function of excitation energy in nuclei of mass A in the range 120÷132. The transition towards the disappearance of the dipole strength, which occurs around 230 MeV excitation energy, appears to be remarkably sharp. Current phenomenological models give qualitative explanations for the quenching but cannot reproduce its detailed features. Keywords: Giant Dipole Resonance, Hot nuclei, Fusion reactions, Statistical Model

Published
2018
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8. Probing clustering in excited alpha-conjugate nuclei

Author

B. Borderie, Ad.R. Raduta, G. Ademard, M.F. Rivet, E. De Filippo, E. Geraci, N. Le Neindre, R. Alba, F. Amorini, G. Cardella, M. Chatterjee, D. Guinet, P. Lautesse, E. La Guidara, G. Lanzalone, G. Lanzano, I. Lombardo, O. Lopez, C. Maiolino, A. Pagano, M. Papa, S. Pirrone, G. Politi, F. Porto, F. Rizzo, P. Russotto, and J.P. Wieleczko

Subjects
Physics, QC1-999
Abstract

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV per nucleon bombarding energy was used to produce α-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and simultaneous decays, evidence in favor of α-particle clustering from excited 16O, 20Ne and 24Mg is reported. Keywords: Heavy ion reactions, alpha-particle clustering, alpha-conjugate nuclei, Cluster models

Published
2016
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10. Search for rare 3-α decays in the region of the Hoyle state of 12C

Author

G. Cardella, A. Bonasera, N.S. Martorana, L. Acosta, E. De Filippo, E. Geraci, B. Gnoffo, C. Guazzoni, L. Lo Monaco, C. Maiolino, A. Pagano, E.V. Pagano, M. Papa, S. Pirrone, G. Politi, F. Risitano, F. Rizzo, P. Russotto, and M. Trimarchi

Subjects
Hoyle state, Nuclear and High Energy Physics, Alpha scattering, Efimov state
Published
2022

11. Per un pugno di libri … scientifici : a divulgation project for high-school students

Author

G F Burgio, C Aramo, C Cicalò, R Colalillo, V Fanti, A Nannini, G Pacini, G Piparo, S Pirrone, C Sasso, V Scotti, G Serri, and A Tricomi

Subjects
History, Computer Science Applications, Education
Abstract

We discuss the project “Per un pugno di libri … scientifici”, aimed at bringing the young generations closer to scientific culture through reading divulgation books about physics. The project, which is addressed to high-school students, is sponsored by INFN and other national and regional research institutions, along with physics departments of some Italian universities.

Published
2023

12. Investigating γ -ray decay of excited C12 levels with a multifold coincidence analysis

Author

G. Cardella, F. Favela, N. S. Martorana, L. Acosta, A. Camaiani, E. De Filippo, N. Gelli, E. Geraci, B. Gnoffo, C. Guazzoni, G. Immè, D. J. Marín-Lámbarri, G. Lanzalone, I. Lombardo, L. Lo Monaco, C. Maiolino, A. Nannini, A. Pagano, E. V. Pagano, M. Papa, S. Pirrone, G. Politi, E. Pollacco, L. Quattrocchi, F. Risitano, F. Rizzo, P. Russotto, V. L. Sicari, D. Santonocito, A. Trifirò, and M. Trimarchi

Subjects
010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2021

13. Ultimate Performance of the FARCOS Detection System

Author

L. Acosta, L. Auditore, C. Boiano, G. Cardella, A. Castoldi, M. D'Andrea, E. De Filippo, S. De Luca, F. Favela, F. Fichera, N. Giudice, B. Gnoffo, A. Grimaldi, C. Guazzoni, G. Lanzalone, F. Librizzi, C. Maiolino, N.S. Martorana, S. Norella, A. Pagano, E. V. Pagano, M. Papa, T. Parsani, G. Passaro, S. Pirrone, G. Politi, L. Quattrocchi, F. Risitano, F. Rizzo, P. Russotto, G. Sacca, G. Salemi, D. Sciliberto, V.L. Sicari, A. Trifiro, and M. Trimarchi

Published
2021

15. Temperature and Density Conditions for Alpha Clustering in Excited Self-Conjugate Nuclei

Author

Bernard Borderie, O. Lopez, Paolo Russotto, F. Rizzo, Nicolas Le Neindre, S. Pirrone, Angelo Pagano, G. Lanzalone, Ivano Lombardo, G. Cardella, Enrico De Filippo, M. Papa, E. Geraci, C. Maiolino, Adriana Raduta, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics and Astronomy (miscellaneous), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], General Mathematics, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, Nuclear Theory (nucl-th), alpha-particle clustering, 0103 physical sciences, Computer Science (miscellaneous), QA1-939, Nuclear Experiment (nucl-ex), 010306 general physics, Cluster analysis, Stellar evolution, Nuclear Experiment, Physics, Range (particle radiation), density, 010308 nuclear & particles physics, temperature, 3. Good health, Supernova, Mean field theory, Chemistry (miscellaneous), Excited state, Saturation (chemistry), self-conjugate nuclei, Mathematics, Conjugate
Abstract

Starting from experimental studies on alpha-clustering in excited self-conjugate nuclei (from $^{16}$O to $^{28}$Si), temperature and density conditions for such a clustering are determined. Measured temperatures have been found in the range of 5.5 - 6.0 MeV whereas density values of 0.3 - 0.4 times the saturation density are deduced, i.e., 0.046 to 0.062 $fm^{-3}$. Such a density domain is also predicted by constrained self-consistent mean field calculations. These results constitute a benchmark for alpha clustering from self-conjugate nuclei in relation to descriptions of stellar evolution and supernovae., 7 pages, 3 figures. arXiv admin note: text overlap with arXiv:1602.05827, arXiv:1603.01114

Published
2021

16. NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR

Author

M.I. Cherciu, N.G. Kozlenko, Andreas Martin Heinz, P. Russotto, Christoph Langer, Z. Elekes, Nasser Kalantar-Nayestanaki, G. Ickert, Thomas Aumann, Thomas Nilsson, L. Zanetti, M. Volknandt, E. M. Orischin, Heiko Scheit, K. Koch, E.V. Pagano, V. Kuznetsov, S. Chakraborty, U. Datta, V. L. Golovtsov, N. Kurz, E. Hoemann, Tanja Heftrich, S. S. Volkov, J. Dreyer, M. Kempe, D. M. Rossi, T. Hensel, A. Horvat, C. Caesar, V. Wagner, G. Politi, I. Lihtar, F. Schindler, B. Löher, Ahibur Rahaman, Catherine Rigollet, J. Kahlbow, H. Törnqvist, A. Kelic-Heil, Herbert A. Simon, Daniel Stach, E. De Filippo, D. Galaviz, N. S. Martorana, Daniel Bemmerer, D. Gonzalez Diaz, D. Körper, Jorge Machado, E. Stan, B. Gnoffo, L. V. Chulkov, P. Teubig, N. Gruzinsky, J. Mayer, G. Alkhazov, J. Hehner, Rene Reifarth, S. Wranne, S. Pirrone, Håkan T Johansson, K. Miki, Lukas Bott, E. Geraci, K. Boretzky, I. Gašparić, H. Heggen, D. Kresan, M. Trimarchi, Kathrin Göbel, D. Jelavić Malenica, J. Stomvall Gill, S.V. Bondarev, M. Holl, Andreas Zilges, D. Yakorev, Joachim Enders, L. Atar, P.-M. Potlog, L. Uvarov, Björn Jonson, Andreas Wagner, Matthias Heil, M. Ciobanu, Á. Horváth, A.G. Krivshich, M. Röder, C.A. Douma, Y. Leifels, Deniz Savran, Kai Zuber, Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, business.industry, High-energy neutron detection, Reactions with relativistic radioactive beams, Plastic scintillator array, Multi-neutron detection, Detector, Scintillator, Time of flight, Optics, Neutron detection, Facility for Antiproton and Ion Research, Neutron, ddc:530, Nuclear Experiment, business, Instrumentation, Image resolution
Abstract

Nuclear instruments & methods in physics research / A 1014, 165701 (2021). doi:10.1016/j.nima.2021.165701, Published by North-Holland Publ. Co., Amsterdam

Published
2021

17. Barrier distributions of the Mg24+Zr90,92 systems: Influence of energy dissipation

Author

L. Quattrocchi, E. De Filippo, N. S. Martorana, E. V. Pagano, A. Pagano, B. Gnoffo, S. Pirrone, E. Piasecki, G. Politi, S. De Luca, Ivano Lombardo, Marina Trimarchi, C. Maiolino, A. Trzcińska, D. Dell'Aquila, G. Cardella, Antonio Trifiro, F. Rizzo, M. Kowalczyk, P. Russotto, G. Lanzalone, and Mariano Vigilante

Subjects
Physics, Distribution (mathematics), 010308 nuclear & particles physics, Projectile, 0103 physical sciences, Atomic physics, Dissipation, 010306 general physics, Coupling (probability), 01 natural sciences, Random matrix, Beam (structure)
Abstract

We present results of barrier distribution measurements for $^{24}\mathrm{Mg}+^{90,92}\mathrm{Zr}$ systems by the backscattering method. The measurements were done at near-barrier beam energies of 68--88.5 MeV (in the laboratory frame) at six angles. A strong discrepancy between experimental results and the predictions of the standard coupled channels calculations was observed. To test the hypothesis that this discrepancy may be due to partial energy dissipation caused by coupling to many target noncollective levels, we performed calculations using the coupled channels plus random matrix theory ($\mathrm{CC}+\mathrm{RMT}$) model. The comparison of calculations with experimental results gives qualitative support of the hypothesis; however, quantitatively the agreement is not as good as in the case of the $^{20}\mathrm{Ne}$ projectile.

Published
2020

18. The NArCoS Project: The Latest Results

Author

E. De Filippo, G. Cardella, S. Pirrone, A. Pagano, Michele Papa, N. S. Martorana, M. Trimarchi, E. V. Pagano, B. Gnoffo, G. Lanzalone, C. Maiolino, E. Geraci, Lucrezia Auditore, G. Politi, F. Rizzo, and P. Russotto

Subjects
Physics, Interferometry, Photomultiplier, Optics, business.industry, Measuring instrument, Neutron detection, Neutron source, business, Particle detector, Charged particle, Semiconductor detector
Published
2020

19. Isospin equilibration phenomenon and mid-rapidity IMF emission in the 48Ca +27 Al 40 MeV/nucleon collision

Author

P. Russotto, L. Acosta, E. V. Pagano, N. S. Martorana, C. Maiolino, S. Pirrone, F. Favela, G. Lanzalone, A. Pagano, F. Rizzo, E. De Filippo, Michele Papa, B. Gnoffo, G. Cardella, E. Geraci, Antonio Trifiro, M. Trimarchi, L. Quattrocchi, and G. Politi

Subjects
Physics, History, Different densities, Intermediate mass fragments, Isospin, Measurements of, Mid-rapidity, Model calculations, Symmetry energies, Collision, Computer Science Applications, Education, Nuclear physics, Rapidity, Nucleon
Abstract

It is discussed the dynamics of Isospin equilibration in reactions involving the production of Intermediate Mass Fragment (IMF) in the mid-rapidity region. The investigation proceeds through the measurements of the reduced value of the total dipolar signal obtained from the measured velocities and charges of all fragments produced in the collision 48 Ca +27 Al at 40 MeV/nucleon. Preliminary experimental results, along with the comparison with CoMD-III model calculations for different density functionals related to the symmetry energy, are presented.

Published
2020

20. Dynamical versus statistical production of Intermediate Mass Fragments at Fermi Energies

Author

G. Lanzalone, E. De Filippo, N. S. Martorana, Luis Acosta, E. Piasecki, K. Siwek-Wilczyńska, Triestino Minniti, F. Porto, Giuseppe Verde, B. Gnoffo, Lucrezia Auditore, E. V. Pagano, S. Pirrone, S. De Luca, Elio Rosato, Angelo Pagano, G. Politi, E. Geraci, C. Maiolino, T. Cap, Ivano Lombardo, M. Trimarchi, Antonio Trifiro, L. Quattrocchi, G. Cardella, Michele Papa, S. Norella, F. Rizzo, P. Russotto, J. Wilczynski, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Nuclear Theory, Order (ring theory), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isospin, 0103 physical sciences, Content (measure theory), Production (computer science), Neutron, Atomic number, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

International audience; The emission probability of Intermediate Mass Fragments (IMFs) in non-central reactions has been investigated in collisions of heavy $^{124}\hbox {Xe}$ projectiles with the two different medium-mass targets of $^{64}\hbox {Ni}$ and $^{64}\hbox {Zn}$ at the laboratory energy of 35 A MeV. The two colliding systems differ only for the target atomic number Z and, consequently, for the isospin N/Z ratio. The probability of IMFs emission from the projectile-like fragment has been measured, showing an enhancement of the IMFs emission for the neutron rich $^{64}\hbox {Ni}$ target. Most of the observed projectile break-up yield is associated with the production of only one IMF, that is, a quasi-binary splitting of projectile in two fragments in a broad range of charge asymmetry. For the events with one IMF, the relative contributions of the dynamical and statistical emissions have been evaluated. We find an enhancement of dynamical break-up probability for the neutron rich target with respect to the neutron poor one. The analysis suggests influence of the target isospin in inducing the dynamical break-up of projectile-like fragments. The new data have been also compared with previous published results of $^{112,124}\hbox {Sn}$ + $^{58,64}\hbox {Ni}$ systems, in order to disentangle between isospin effects against system-size effects on the emission probability. The comparisons between previous and new data suggest that the dynamical break-up is determined by the N/Z content of both projectile and target; for the cases here investigated, the influence of the system size on the dynamical emission probability can be excluded.

Published
2020

21. Nuclear neck-density determination at Fermi energy with CHIMERA detector

Author

Angelo Pagano, S. Pirrone, E. V. Pagano, Lucrezia Auditore, Michele Papa, P. Russotto, T. Cap, C. Maiolino, Antonio Trifiro, L. Quattrocchi, G. Politi, F. Rizzo, E. Piasecki, Luis Acosta, K. Siwek-Wilczyńska, B. Gnoffo, F. Favela, Maria Colonna, Marina Trimarchi, E. Geraci, G. Cardella, E. De Filippo, N. S. Martorana, M. B. Chatterjee, and G. Lanzalone

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Fermi energy, Nuclear matter, 01 natural sciences, Asymmetry, Nuclear physics, Isospin, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Nucleon, Nuclear density, media_common
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.

Published
2020

22. On the 12C Hoyle state gamma decay

Author

E. V. Pagano, E. De Filippo, V. L. Sicari, Michele Papa, G. Cardella, S. Pirrone, F. Rizzo, N. S. Martorana, C. Maiolino, E. C. Pollacco, A. Camaiani, S. De Luca, P. Russotto, D. J. Marín-Lámbarri, C Guazzoni, A. Nannini, F. Favela, L. Acosta, Nicla Gelli, Domenico Santonocito, E. Geraci, B. Gnoffo, Lucrezia Auditore, G. Politi, Antonio Trifiro, L. Quattrocchi, G. Lanzalone, A. Pagano, M. Trimarchi, A. D. Russo, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, Hoyle state, History, gamma decay, sezele, 010308 nuclear & particles physics, Gamma ray, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Measure (mathematics), Coincidence, Computer Science Applications, Education, Nuclear physics, redundant kinematics, Excited state, Rise time, 0103 physical sciences, Decay chain, 010306 general physics, Beam (structure)
Abstract

The γ-decays of 12C excited levels (the Hoyle state 0+ at 7.65 MeV and the 9.64 MeV 3) are essential for its production in the universe. We present here a new attempt to precisely measure such γ-decay probabilities. The measurement was performed at INFN-LNS in Catania using the 4π CHIMERA multidetector. In order to measure these low probability decay-channels we performed 4-fold coincidence measurements. The 12C target nuclei were excited by using a beam of 64 MeV α-particles produced by the Superconducting Cyclotron (CS) of INFN-LNS. The scattered α-particles and the 12C recoils were detected and identified by? E-E and ToF methods using CHIMERA telescopes. The two emitted γ-rays in the decay chain were detected and identified by using the second stage of the telescopes, CsI(Tl) scintillators, by means of fast-slow and rise time techniques. Kinematics and energy-momentum conservation laws were used to constrain the data analysis. Also the 3-α decay channel probability was measured. Such a simultaneous measurement of all known decay channels was useful to reduce the systematic errors. Preliminary results of the data analysis are reported.

Published
2020

23. The NArCoS Project: efficiency estimation and the cross talk problem studied through Monte Carlo simulations

Author

P. Russotto, Lucrezia Auditore, G. Lanzalone, G. Politi, B. Gnoffo, S. Pirrone, F. Rizzo, E. V. Pagano, M. Trimarchi, E. De Filippo, A. Pagano, G. Cardella, N. S. Martorana, Michele Papa, E. Geraci, and C. Maiolino

Subjects
Neutrons, Physics, Estimation, History, Radioactivity, Charged particles, Monte Carlo methods, Monte Carlo method, Statistical physics, Computer Science Applications, Education
Abstract

With the advent of the new radioactive beam facilities it is necessary to develop neutron detection systems integrated with charged particle ones. The integration of the neutron signal, especially in using neutron rich beams, becomes a mandatory requirement in order to study the property of the nuclear matter in extreme conditions. For this reason new detectors using new materials have to be built. In this contribution, some new results about the efficiency estimation and the cross talk problem studied through GEANT4 simulations, related to the NArCoS project, will be described with the aim to design a new detector of both good energy and angular resolution. The detection of neutrons and charged particles in the same elementary detection cell is envisaged.

Published
2020

24. Gamma ray detection with CHIMERA at LNS: Results and perspectives

Author

E. De Filippo, N. S. Martorana, F. Favela, C. Maiolino, Luis Acosta, Nicla Gelli, Chiara Guazzoni, E. Geraci, E. V. Pagano, Antonio Trifiro, L. Quattrocchi, A. Pagano, S. De Luca, D. J. Marín-Lámbarri, M. Trimarchi, M.V. Andrés, V. L. Sicari, E. C. Pollacco, Michele Papa, Domenico Santonocito, G. Cardella, A. Nannini, A. Camaiani, G. Politi, B. Gnoffo, S. Pirrone, F. Rizzo, P. Russotto, E. G. Lanza, G. Lanzalone, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, History, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Detector, Resolution (electron density), Gamma ray, 01 natural sciences, Resonance (particle physics), Charged particle, Computer Science Applications, Education, law.invention, Telescope, Nuclear physics, Stars, law, Excited state, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We describe the use of the 4tt CHIMERA charged particle detector as a large efficiency y-ray detector. The CsI(Tl) stage of the CHIMERA telescope is used to detect and identify y-rays. The high detection efficiency and the sufficient energy resolution guaranteed by CsI(Tl) allows us to use the detector for the study of rare decays. Two examples are reported: the low probability gamma decay (68Ni; the measurement of the gamma decay probability of excited levels of 12C as the Hoyle state at 7.65 (∼10−4) MeV and the 3- level at 9.64 MeV (∼107), both important for the Carbon production in stars. Future experiments made possible at INFN-LNS by the availability of the new fragment separator FRAISE are also outlined.

Published
2020

25. Measurements of pulse shape discrimination with EJ 299-33 plastic scintillator using heavy ion reaction

Author

E. V. Pagano, E. Geraci, T. Parsani, S. Pirrone, G. Cardella, Chiara Guazzoni, E. De Filippo, N. S. Martorana, M. B. Chatterjee, Michele Papa, Antonio Trifiro, F. Rizzo, Lucrezia Auditore, B. Gnoffo, L. Quattrocchi, F. Porto, G. Politi, S. De Luca, C. Maiolino, P. Russotto, G. Lanzalone, Marina Trimarchi, and Angelo Pagano

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, Charged particles detector, Digital acquisition, Neutrons detector, Plastic scintillator, Instrumentation, Scintillator, 01 natural sciences, Neutrons detector, Charged particles detector, Plastic scintillator, Digital acquisition, Ion, Optics, 0103 physical sciences, 010306 general physics, Physics, sezele, 010308 nuclear & particles physics, Scattering, business.industry, Anode, business, Beam (structure)
Abstract

The motivation of the present paper is to study the performance of EJ 299-33 scintillator in online and off-line analysis in high rate scattering for nuclear reaction experiments performed with heavy ions. An experiment was carried out inside the CHIMERA chamber using 24Mg beams at 71.5 MeV and 81 MeV impinging on 92ZrO2 target. The plastic scintillator was backed by a photomultiplier tube and the anode pulses were digitized through 100 MHz GET electronics for the purpose of pulse shape discrimination (PSD) studies. Performances of the plastic scintillator have been tested with respect to PSD capabilities and energy spectra analysis under beam irradiations in a high background environment.

Published
2018

26. Mapping the demise of collective motion in nuclei at high excitation energy

Author

S. Pirrone, Lucrezia Auditore, R. Coniglione, Domenico Santonocito, Antonio Trifiro, C. Monrozeau, E. Migneco, E. La Guidara, C. Maiolino, R. Alba, G. Bellia, O. Wieland, G. Cardella, Marina Trimarchi, F. Hongmei, H. X. Huang, Michele Papa, C. Agodi, P. Piattelli, Y. Blumenfeld, F. Rizzo, A. Del Zoppo, E. De Filippo, Paolo Sapienza, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Quenching, Nuclear and High Energy Physics, Range (particle radiation), Hot nuclei, Giant Dipole Resonance, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Fusion reactions, Statistical Model, 010308 nuclear & particles physics, Detector, 01 natural sciences, Resonance (particle physics), lcsh:QC1-999, Nuclear physics, Dipole, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, lcsh:Physics, Energy (signal processing), Excitation
Abstract

High energy gamma-rays from the 116Sn + 24Mg reaction at 23A MeV were measured using the MEDEA detector at LNS – INFN Catania. Combining this new data with previous measurements yields a detailed view of the quenching of the Giant Dipole Resonance as a function of excitation energy in nuclei of mass A in the range 120÷132. The transition towards the disappearance of the dipole strength, which occurs around 230 MeV excitation energy, appears to be remarkably sharp. Current phenomenological models give qualitative explanations for the quenching but cannot reproduce its detailed features. Keywords: Giant Dipole Resonance, Hot nuclei, Fusion reactions, Statistical Model

Published
2018

27. The FARCOS detection system: the first application in a real experiment

Author

T. Parsani, Chiara Guazzoni, P. Russotto, E. V. Pagano, F. Fichera, D. Sciliberto, F. De Benedetti, V. L. Sicari, S. Norella, L. Quattrocchi, A. Pagano, Antonio Trifiro, S. Pirrone, S. De Luca, Andrea Castoldi, Lucrezia Auditore, F. Favela, S. Maffesanti, F. Rizzo, C. Boiano, E. Geraci, G. Lanzalone, G. Cardella, C. Maiolino, N. Giudice, F. Librizzi, Luis Acosta, Marina Trimarchi, A. Grimaldi, Michele Papa, B. Gnoffo, E. De Filippo, N. S. Martorana, G. Politi, G. Salemi, M. D'Andrea, G. Passaro, and G. Sacca

Subjects
Materials science, Calorimeter (particle physics), Silicon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Detector, chemistry.chemical_element, Scintillator, Modular design, 01 natural sciences, 030218 nuclear medicine & medical imaging, Photodiode, law.invention, 03 medical and health sciences, 0302 clinical medicine, Optics, chemistry, law, 0103 physical sciences, Stage (hydrology), business
Abstract

FARCOS is a modular detection system intended to boost the capacity of 4π detectors towards correlation measurements. The final FARCOS system will be composed of 20 telescopes, each formed by two Si layers of 32-ch orthogonal Double Sided Silicon Strip Detectors and one calorimeter stage composed by 4 CsI(Tl) tronco-pyramidal scintillator crystals readout by a Si photodiode. The paper focuses on the first application of the FARCOS detection array in the present configuration of 10 telescopes in a real experiment, the CHIFAR experiment and discusses the main instrumental features relevant for the experiments.

Published
2019

28. Experimental investigation of α condensation in light nuclei

Author

S. Bailey, E. V. Pagano, Antonio Trifiro, L. Quattrocchi, L. Francalanza, Mariano Vigilante, P. Russotto, I. Stefan, S. De Luca, G. Lanzalone, Giuseppe Verde, F. Rizzo, M. Assié, S. Pirrone, A. Pagano, Luis Acosta, B. Gnoffo, T. Kokalova, D. Dell'Aquila, Martin Freer, Michele Papa, Robin Smith, G. Cardella, I. Lombardo, M. Trimarchi, G. Politi, C. Wheldon, E. De Filippo, N. S. Martorana, J. Bishop, N. Curtis, S. Norella, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Bishop, J., Kokalova, T., Freer, M., Acosta, L., Assie, M., Bailey, S., Cardella, G., Curtis, N., De Filippo, E., Dell'Aquila, D., De Luca, S., Francalanza, L., Gnoffo, B., Lanzalone, G., Lombardo, I., Martorana, N. S., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Rizzo, F., Russotto, P., Quattrocchi, L., Smith, R., Stefan, I., Trifiro, A., Trimarchi, M., Verde, G., Vigilante, M., Wheldon, C., and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Reaction mechanism, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, 010308 nuclear & particles physics, Nuclear structure, Coulomb barrier, Nuclear Structure, Nuclear Clustering, Light nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Molecular physics, Dissociation (chemistry), medicine.anatomical_structure, 0103 physical sciences, medicine, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Nucleus, Fermi Gamma-ray Space Telescope
Abstract

International audience; Background: Near-threshold α-clustered states in light nuclei have been postulated to have a structure consisting of a diffuse gas of α particles which condense into the 0s orbital. Experimental evidence for such a dramatic phase change in the structure of the nucleus has not yet been observed. Purpose: To understand the role of α condensation in light nuclei experimentally. Method: To examine signatures of this α condensation, a compound nucleus reaction using 160-, 280-, and 400-MeV O16 beams impinging on a carbon target was used to investigate the C12(O16,7α) reaction. This permits a search for near-threshold states in the α-conjugate nuclei up to Mg24. Results: Events up to an α-particle multiplicity of seven were measured and the results were compared to both an extended Hauser-Feshbach calculation and the Fermi breakup model. The measured multiplicity distribution exceeded that predicted from a sequential decay mechanism and had a better agreement with the multiparticle Fermi breakup model. Examination of how these 7α final states could be reconstructed to form Be8 and C12(02+) showed a quantitative difference in which decay modes were dominant compared to the Fermi breakup model. No new states were observed in O16, Ne20, and Mg24 due to the effect of the N-α penetrability suppressing the total α-particle dissociation decay mode. Conclusion: The reaction mechanism for a high-energy compound nucleus reaction can only be described by a hybrid of sequential decay and multiparticle breakup. Highly α-clustered states were seen which did not originate from simple binary reaction processes. Direct investigations of near-threshold states in N-α systems are inherently impeded by the Coulomb barrier prohibiting the observation of states in the N-α decay channel. No evidence of a highly clustered 15.1-MeV state in O16 was observed from [Si★28,C12(02+)]O16(06+) when reconstructing the Hoyle state from three α particles. Therefore, no experimental signatures for α condensation were observed.

Published
2019

29. Isospin Effect on fragment productions and reaction mechanisms for Ni+Ca systems at 25 AMeV

Author

Antonio Trifiro, Giovanni Casini, M. Trimarchi, F. Gramegna, S. Pirrone, F. Rizzo, Luca Morelli, E. Geraci, R. Bougault, N. Le Neindre, Sandro Barlini, C. Maiolino, E. V. Pagano, Maria Colonna, E. De Filippo, M. Bruno, P. Russotto, Michele Papa, A. Pagano, N. S. Martorana, G. Politi, G. Cardella, M. D'Agostino, B. Gnoffo, L. Monaco, G. Lanzalone, Silvia Piantelli, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Multi-detectors, Physics, History, Reaction mechanism, Multifragmentation, Isospin asymmetries, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Stereochemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Out of equilibrium, 01 natural sciences, Excited systems, Fusion evaporation residues, Global variables, Computer Science Applications, Education, Fragment (logic), Isospin, 0103 physical sciences, 010306 general physics
Abstract

Main features of fragments produced in 58Ni+40Ca and 58Ni+48Ca systems at 25 AMeV, collected by Chimera multidetector at INFN Laboratori Nazionali del Sud (Italy), are analysed in order to study properties of moderately excited systems (Ex=2-5 AMeV) formed in central collisions. By means of correlations between specific global variables, sensitive to the centrality of the collision, a stringent selection of Fusion-Evaporation residues, Multifragmentation sources and their decay products has been performed. The influence of the isospin contents of the systems on the reaction mechanism is carefully investigated and relevant observables such as isospin asymmetry N/Z or charge and mass of fragments, are discussed in order to probe the fragmentation path, characterised by short living ( ∼ 100fm/c) low density states of nuclear matter out of equilibrium. Preliminary comparisons with predictions of the BLOB model, in a semi-classical mean field framework, are presented, investigating cluster production emerging from the occurrence of low-density instabilities in central collisions.

Published
2019

30. The $\gamma$ decay of the Hoyle and higher excitation energy states of $^{12}$C

Author

G. Cardella, F. Favela, G. Lanzalone, Nicla Gelli, M. Trimarchi, Chiara Guazzoni, E. Geraci, B. Gnoffo, L. Acosta, S. Pirrone, F. Rizzo, Michele Papa, Antonio Trifiro, L. Quattrocchi, E. V. Pagano, J. Marìn-Làmbarri, Domenico Santonocito, L. Monaco, E. C. Pollacco, P. Russotto, A. Nannini, Lucrezia Auditore, V. L. Sicari, A. Camaiani, G. Politi, C. Maiolino, E. De Filippo, N. S. Martorana, A. Pagano, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, Excitation energy, History, sezele, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Ground state, Gamma rays, Carbon, 01 natural sciences, Computer Science Applications, Education, 0103 physical sciences, Energy level, Atomic physics, 010306 general physics, Excitation
Abstract

The 0 2 + Hoyle state and few other excited levels of 12C are fundamental for the production of carbon in the universe. In particular, the γ decay branching ratio is of utmost importance, being the only way to produce a carbon at the ground state. For the purpose to precisely investigate the decay mechanism of such states we conducted an experiment, at Laboratori Nazionali del Sud-Istituto Nazionale di Fisica Nucleare (INFN-LNS), using the reaction α + 12 C at 64 MeV. We used the 4π CHIMERA detector to detect both α and γ 12 C decay channels. Details of the experiment and preliminary results are discussed in the paper.

Published
2019

31. Isospin influence on fragments production in$^{78}$Kr + $^{40}$Ca and $^{86}$Kr + $^{48}$Ca collisions at 10 MeV/nucleon

Author

G. Spadaccini, E. V. Pagano, S. Pirrone, E. La Guidara, L. Quattrocchi, Maria Colonna, C. Beck, Michele Papa, F. Rizzo, Antonio Trifiro, E. Piasecki, Antonio D'Onofrio, E. Geraci, Denis Lacroix, M. La Commara, P. Russotto, Lucrezia Auditore, G. Politi, Sh. A. Kalandarov, Marina Trimarchi, Elio Rosato, E. De Filippo, B. Gnoffo, Mariano Vigilante, G. Lanzalone, A. Pagano, G. Cardella, F. Amorini, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Pirrone, S., Politi, G., Gnoffo, B., La Commara, M., De Filippo, E., Russotto, P., Trimarchi, M., Vigilante, M., Colonna, M., Kalandarov, S. A., Amorini, F., Auditore, L., Beck, C., Cardella, G., D'Onofrio, A., Geraci, E., Lacroix, D., La Guidara, E., Lanzalone, G., Pagano, A., Pagano, E. V., Papa, M., Piasecki, E., Quattrocchi, L., Rizzo, F., Rosato, E., Spadaccini, G., and Trifiro, A.

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, Isospin, 0103 physical sciences, Nuclear fusion, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

International audience; In heavy ion collisions at low energy (E/A < 10–15 MeV/nucleon) the N/Z ratio in the entrance channel is closely related to the isospin degree of freedom and can influence the reaction mechanisms and consequently the production of the fragments in the exit channel. We analyse the fragment production cross sections in the reactions$^{86}$Kr +$^{48}$Ca and$^{78}$Kr +$^{40}$Ca , at the laboratory energy of 10 MeV/nucleon. The experiment was conducted at the INFN Laboratori Nazionali del Sud in Catania, by using the $ 4\pi$ detector CHIMERA. For the two reactions, elastic scattering measurements are performed to extract the normalization factor used to evaluate the absolute cross sections. Velocity and energy spectra, mass and charge distributions, as well as dynamic features of reaction products, are studied. The study of the characteristics of mass and charge distributions, energy and velocity spectra of the reaction products shows mainly a relaxed component, related to fusion reaction followed by evaporation or binary decay. Nevertheless signals ascribable to a non equilibrated component are present. Structure effects are evident in the staggered shape of emitted fragments cross sections and are more pronounced in the neutron poor system. The analysis highlights clear differences for the two systems in the contributions arising from different reaction mechanisms. Besides, a study of the overall influence from the entrance channel energy is performed. Comparisons to DNS (DiNuclear System) and GEMINI++ models are reported. The data analysis indicates a slightly higher fusion-evaporation cross section and a strongly pronounced probability of fission-like processes for the neutron poor system with respect to the neutron rich one. The neutron enrichment seems thus to limit the formation of the composite system and to inhibit the fission decay channel.

Published
2019

32. Intermediate Mass Fragments production at low energy: reaction mechanism and isospin influence

Author

Angelo Pagano, E. V. Pagano, Luigi Lo Monaco, Paolo Russotto, S. Pirrone, N. S. Martorana, E. Geraci, G. Cardella, A. D. Russo, F. Rizzo, Ernest Piasecki, Marina Trimarchi, B. Gnoffo, Giuseppe Politi, and Enrico De Filippo

Subjects
Physics, Reaction mechanism, Work (thermodynamics), 010308 nuclear & particles physics, QC1-999, Phase (waves), Space (mathematics), 01 natural sciences, Multi detector, Nuclear physics, Low energy, Isospin, 0103 physical sciences, Selection method, 010306 general physics
Abstract

In this work, we present a recent study concerning the break-up of the Projectile-Like (PLF) into two fragments, following more violent deep-inelastic collisions in the reactions 78Kr + 40Ca and 86Kr + 48Ca at 10 A MeV, realized at INFN-Laboratori Nazionali del Sud by using the 4π multi detector CHIMERA. For these systems, we have already analyzed the fusion-evaporation and fission-like processes. A selection method has been developed, in order to discriminate PLF break up events from those due to other mechanisms which populate the same region of the phase- space. A preference for PLF aligned break-up, along the direction of the PLF-TLF separation axis with the light fragment emitted in the backward part, has been put in light, suggesting the presence of dynamical effects. Also a comparison between the neutron-rich 86Kr + 48Ca and neutron-poor 78Kr + 40Ca systems is presented, to put in evidence the isospin role in these processes.

Published
2019

33. Architecture of the FARCOS detection system and first beam experiments

Author

Antonio Trifiro, S. Pirrone, S. De Luca, N. Giudice, Luis Acosta, E. V. Pagano, G. Salemi, F. Favela, M. D'Andrea, V. L. Sicari, Michele Papa, G. Passaro, Andrea Castoldi, Lucrezia Auditore, G. Sacca, L. Quattrocchi, C. Maiolino, G. Politi, T. Parsani, F. Librizzi, F. Fichera, D. Sciliberto, B. Gnoffo, C. Boiano, G. Cardella, G. Lanzalone, S. Maffessanti, E. De Filippo, N. S. Martorana, A. Grimaldi, P. Russotto, F. De Benedetti, F. Rizzo, A. Pagano, Fabio Previdi, M. Trimarchi, S. Norella, and Chiara Guazzoni

Subjects
Physics, Modularity (networks), sezele, Calorimeter (particle physics), 010308 nuclear & particles physics, business.industry, Modular design, Scintillator, 01 natural sciences, Charged particle, 030218 nuclear medicine & medical imaging, law.invention, Telescope, 03 medical and health sciences, 0302 clinical medicine, Optics, law, 0103 physical sciences, Cluster (physics), business, Beam (structure)
Abstract

The FARCOS (Femtoscope ARray for Correlation and Spectroscopy) collaboration is finally going to instrument the first batch of 10-12 telescopes. They are capable of reconstructing the particle’s momentum with a high degree of precision and of performing correlation measurements of Light Charged Particles (LCPs) and of LCPs and Intermediate Mass Fragments thanks to the very good energy and angular and resolution. Each telescope features a sensitive area of 6.4 × 6.4 cm2 and is composed of three detection stages: two Si layers and a CsI(Tl) calorimeter. The FARCOS cluster modularity allows the arrangement in different configurations, depending on the physics case one wants to address. The final system will be a modular assembly of 20 telescopes. The total number of readout channels for the final FARCOS system is 2560 channels for the silicon layers and 80 channels for the scintillators. In this paper, we focus on the FARCOS basic module and system architecture and illustrate its performance as assessed in test beams in true experimental conditions.

Published
2018

34. Isospin effects on reaction dynamics at Fermi energies

Author

G. Lanzalone, Paolo Russotto, Erik Piasecki, F. Catara, Marina Trimarchi, S. Pirrone, E. G. Lanza, Marco La Commara, M.V. Andrés, E. V. Pagano, Giuseppe Politi, Lucia Quattrocchi, K. Siwek-Wilczyńska, Andrea Vitturi, A. Pagano, M. Papa, B. Gnoffo, G. Cardella, Shuhrat Kalandarov, N. S. Martorana, E. Geraci, Antonio D'Onofrio, Domenico Santonocito, Enrico De Filippo, C. Maiolino, Lucrezia Auditore, Maria Colonna, F. Rizzo, T. Cap, Antonio Trifiro, Luis Acosta, C. Beck, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Field (physics), 010308 nuclear & particles physics, QC1-999, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, 7. Clean energy, Symmetry (physics), Nuclear physics, Physics and Astronomy (all), Reaction dynamics, Isospin, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment, Fermi Gamma-ray Space Telescope
Abstract

International audience; The study of nuclei properties and of collision dynamics is a very active research field whose result have implications in different domains as for example astrophysics. The present and future facilities delivering radioactive ion beams with high intensity allow to extend these studies in the region far from the stability valley. New insight has thus been found on the effects of neutron richness on reaction mechanisms as well as on nuclear structure and nuclear matter properties, as for instance, the role of symmetry energy term of the nuclear Equation of State. The presence of diverse reaction products demands for highly performing and very specialized devices, also able to disentangle among different mechanisms, from fast dynamical processes to statistical emission from equilibrated sources. Numerous studies of the effects of N/Z ratio on fusion and associated processes can be found at different energies, together with many examples of the influence of neutron richness on the reaction time scale and the competition between equilibrated and prompt processes. A survey of very recent findings obtained with the CHIMERA and FARCOS devices is presented.

Published
2018

35. Experimental Study of the Pygmy Dipole Resonance in the 68Ni Nucleus

Author

E. G. Lanza, G. Cardella, Andrea Vitturi, B. Gnoffo, F. Rizzo, E. V. Pagano, E. De Filippo, N. S. Martorana, Daniele Dell' Aquila, S. Pirrone, Lucrezia Auditore, P. Russotto, Domenico Santonocito, C. Maiolino, S. De Luca, Antonio Trifiro, L. Acosta, Mariano Vigilante, L. Quattrocchi, Michele Papa, G. Lanzalone, G. Politi, S. Norella, M.V. Andrés, F. Catara, Ivano Lombardo, M. Trimarchi, A. Pagano, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Martorana, N. S., Cardella, G., Lanza, E. G., Acosta, L., Andrés, M. V., Auditore, L., Catara, F., De Filippo, E., De Luca, S., Dell'Aquila, D., Gnoffo, B., Lanzalone, G., Lombardo, I., Maiolino, C., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Quattrocchi, L., Rizzo, F., Russotto, P., Santonocito, D., Trifirò, A., Trimarchi, M., Vigilante, M., and Vitturi, A.

Subjects
Physics, Dipole, Physics and Astronomy (all), medicine.anatomical_structure, Nuclear magnetic resonance, medicine, Nuclear structure, heavy ions, General Physics and Astronomy, Resonance, Nucleus
Abstract

It is known that the low-energy E1 strength, known as the Pygmy Dipole Resonance (PDR), can be excited by both isovector and isoscalar probes. In this work, we report on the results of an experiment, carried out at the LNS-INFN in Catania, with the aim to study the Pygmy Dipole Resonance induced in the 68Ni nucleus through the interaction with a 12C isoscalar target. The CHIMERA multidetector and the FARCOS array were used to detect, respectively, γ rays and charged particles. Details on the experimental set-up, data analysis and results are reported.

Published
2018

36. First results of the Hoyle-Gamma experiment: Study of the excited levels in carbon-12 gamma decay

Author

F. Rizzo, A. Camaiani, S. Pirrone, F. Favela, Nicla Gelli, E. V. Pagano, G. Cardella, Antonio Trifiro, L. Quattrocchi, P. Russotto, E. De Filippo, Lucrezia Auditore, Michele Papa, S. De Luca, G. Politi, G. Lanzalone, C. Maiolino, N. S. Martorana, A. Nannini, D. J. Marín-Lámbarri, E. C. Pollacco, B. Gnoffo, Luis Acosta, A. Pagano, M. Trimarchi, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, History, 010308 nuclear & particles physics, Carbon-12, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Measure (mathematics), Computer Science Applications, Education, Preliminary analysis, Nuclear physics, Physics and Astronomy (all), Orders of magnitude (time), Excited state, 0103 physical sciences, 010306 general physics
Abstract

International audience; Preliminary analysis of the Hoyle-Gamma experiment is presented, where simultaneous gamma-particles detection for the α + 12C → α + (12C* + γ) reaction is used to suppress the background various orders of magnitude. This will allow us to measure very small Γ partial widths of 12C. Details of the method, the implementation and CHIMERA software analysis are presented as well as preliminary results.

Published
2018

37. Structure of 10Be and 16C nuclei via break-up reactions studied with the 4π Chimera array

Author

F. Amorini, P. Russotto, Antonio Trifiro, L. Quattrocchi, Elio Rosato, G. Cardella, Amalia Pop, R. Andolina, Lucrezia Auditore, B. Gnoffo, Mariano Vigilante, D. Dell'Aquila, Michele Papa, F. Rizzo, G. Lanzalone, G. Politi, Giuseppe Verde, Triestino Minniti, E. De Filippo, E. V. Pagano, N. S. Martorana, M.B. Chatterjiee, I. Berceanu, S. Pirrone, L. Francalanza, Luis Acosta, A. Grzeszczuk, F. Porto, A. Pagano, M. Trimarchi, Ivano Lombardo, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Dell'Aquila, D., Acosta, L., Amorini, F., Andolina, R., Auditore, L., Berceanu, I., Cardella, G., Chatterjiee, M. B., De Filippo, E., Francalanza, L., Gnoffo, B., Grzeszczuk, A., Lanzalone, G., Lombardo, I., Martorana, N., Minniti, Domenica, Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, Mauro, Pop, A., Porto, F., Quattrocchi, L., Rizzo, F., Rosato, E., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Subjects
Nuclear reaction, History, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Education, Physics and Astronomy (all), Helium-4, Isotopes, 0103 physical sciences, Neutron, 010306 general physics, Spectroscopy, Nuclear Experiment, break-up reactions, Isotopes of helium, Physics, Valence (chemistry), 010308 nuclear & particles physics, Nuclear Structure, Nuclear Clustering, Light nuclei, Computer Science Applications, Physics::Accelerator Physics, Atomic physics, Isotopes of beryllium, Excitation
Abstract

International audience; The study of cluster states in neutron-rich Be and C isotopes is a subject of interest in Nuclear Physics. These states should be characterized by high deformation where α-clusters are bounded by valence neutrons. We performed a spectroscopic study of 10Be and 16C isotopes via projectile break-up reactions, by using radioactive beams produced at the INFN-LNS FRIBs facility and the Chimera 4π array. The possible evidence of a new 10Be state at 13.5 MeV excitation energy was found in the 6He+4He disintegration channel. The spectroscopy of 16C was studied via the 6He+10Be break-up channel; in this case we found the indication of a possible new state at about 20.6 MeV.

Published
2018

38. Statistical against dynamical PLF fission as seen by the IMF-IMF correlation functions and comparisons with CoMD model

Author

M. Trimarchi, Luis Acosta, K. Siwek-Wilczyńska, Lucrezia Auditore, L. Quattrocchi, B. Gnoffo, P. Russotto, G. Cardella, A. Pagano, Maria Colonna, G. Politi, E. Geraci, F. Rizzo, E. De Filippo, N. S. Martorana, E. V. Pagano, A. Trifirò, S. Pirrone, G. Lanzalone, F. Porto, E. Piasecki, T. Cap, Michele Papa, and C. Maiolino

Subjects
Nuclear reaction, Physics, History, 010308 nuclear & particles physics, Fission, media_common.quotation_subject, Binary number, Charge (physics), Function (mathematics), 01 natural sciences, Asymmetry, Computer Science Applications, Education, Nuclear physics, Correlation function (statistical mechanics), Physics and Astronomy (all), 0103 physical sciences, Nuclear Experiment, 010306 general physics, Fermi Gamma-ray Space Telescope, media_common
Abstract

In nuclear reactions at Fermi energies two and multi particles intensity interferometry correlation methods are powerful tools in order to pin down the characteristic time scale of the emission processes. In this paper we summarize an improved application of the fragment-fragment correlation function in the specific physics case of heavy projectile-like (PLF) binary massive splitting in two fragments of intermediate mass(IMF). Results are shown for the reverse kinematics reaction 124 Sn+64 Ni at 35 AMeV that has been investigated by using the forward part of CHIMERA multi-detector. The analysis was performed as a function of the charge asymmetry of the observed couples of IMF. We show a coexistence of dynamical and statistical components as a function of the charge asymmetry. Transport CoMD simulations are compared with the data in order to pin down the timescale of the fragments production and the relevant ingredients of the in medium effective interaction used in the transport calculations.

Published
2018

39. Pulse shape discrimination of plastic scintillator EJ 299-33 with radioactive sources

Author

T. Parsani, Chiara Guazzoni, Lucrezia Auditore, F. Porto, G. Cardella, S. De Luca, S. Pirrone, Marina Trimarchi, G. Politi, M. B. Chatterjee, Michele Papa, A. Trifirò, L. Quattrocchi, E. V. Pagano, P. Russotto, G. Lanzalone, Angelo Pagano, C. Maiolino, E. De Filippo, N. S. Martorana, E. Geraci, F. Rizzo, and B. Gnoffo

Subjects
Photomultiplier, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Instrumentation, Scintillator, 01 natural sciences, Charged particles detection, Neutron and gamma detection, Plastic scintillator, Pulse shape discrimination, Optics, 0103 physical sciences, Figure of merit, Neutron, 010306 general physics, Physics, Neutron and gamma detection, Charged particles detection, Pulse shape discrimination, Plastic scintillator, sezele, 010308 nuclear & particles physics, business.industry, Alpha particle, Charged particle, Anode, business
Abstract

The present study has been carried out in order to investigate about the possibility of using EJ 299-33 scintillator in a multi-detector array to detect neutrons along with light charged particles. In a reaction induced by stable and exotic heavy-ions beams, where copious production of neutrons and other light charged particles occurs, discrimination with low identification threshold of these particles are of great importance. In view of this, EJ 299-33 scintillator having dimension of 3 cm × 3 cm × 3 cm backed by a photomultiplier tube was tested and used under vacuum to detect neutrons, gamma-rays and alpha particles emitted by radioactive sources. Anode pulses from the photomultiplier tube were digitized through GET electronics, recorded and stored in a data acquisition system for the purpose of an off-line analysis. The measurements, under vacuum and low background conditions, show good pulse shape discrimination properties characterized by low identification threshold for neutrons, gamma-rays and alpha particles. The Figures of Merit for neutron-gamma and alpha particles-gamma discriminations have been evaluated together with the energy resolution for gamma-ray and alpha particles.

Published
2018

40. Signals for dynamical process from IMF-IMF correlation function

Author

S. Pirrone, K. Siwek Wilczyńska, G. Lanzalone, M. Trimarchi, E. Piasecki, E. De Filippo, Michele Papa, N. S. Martorana, F. Porto, C. Maiolino, M. Casolino, A. Pagano, E. Geraci, Lucrezia Auditore, P. Russotto, T. Cap, Antonio Trifiro, G. Politi, L. Quattrocchi, F. Rizzo, B. Gnoffo, L. Acosta, E. V. Pagano, and G. Cardella

Subjects
Physics, Correlation function (statistical mechanics), Inverse kinematics, media_common.quotation_subject, Binary number, Fermi energy, Charge (physics), Function (mathematics), Statistical physics, Nuclear Experiment, Breakup, Asymmetry, media_common
Abstract

In this paper we briefly discuss about a novel application of the IMF- IMF correlation function in the physics case of heavy projectile-like (PLF) binary fission-like massive splitting in heavy ion collisions at Fermi energy. In particular, results are shown for the reverse kinematics reaction 124Sn+64Ni at 35 AMeV that has been investigated by using the forward part of CHIMERA multi-detector. Transport CoMD simulations are compared with the data. The main analysis was performed as a function of the charge asymmetry of the decay channel. The coexistence of dynamical and statistical components as a function of the charge asymmetry of the binary breakup is clearly evidenced. We show that the IMF-IMF correlation functions, when coupled with transport calculations, can be used to pin down the timescale of the fragments production and consequently the relevant ingredients of the in medium effective interaction. Efforts are being planned to extend the method to different reaction mechanisms and nuclear systems and, also, to compare the data with different transport theory simulations.

Published
2017

41. Study of two- and multi-particle correlations in 12C+24Mg and 12C+208Pb reactions at E=35 AMeV

Author

Ismael Martel, A. Chbihi, P. Russotto, B. Gnoffo, D. Dell'Aquila, Lucrezia Auditore, Triestino Minniti, A. Trifirò, L. Quattrocchi, G. Politi, F. Amorini, Luis Acosta, F. Rizzo, M. Trimarchi, S. Norella, F. Porto, A. Anzalone, Giuseppe Verde, A. Grzeszczuk, S. Pirrone, Martin Veselsky, L. Francalanza, E. V. Pagano, G. Cardella, I. Berceanu, Elio Rosato, Ivano Lombardo, A. Pagano, E. De Filippo, Michele Papa, Mariano Vigilante, G. Lanzalone, Dip. Fisica, Università di Messina, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), V. Greco, M. La Cognata, S. Pirrone, F. Rizzo, C. Spitaleri, Greco, V., Quattrocchi, L., Acosta, L., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cardella, G., Chbihi, A., De Filippo, E., Dell'Aquila, D., Francalanza, L., Gnoffo, B., Grzeszczuk, A., Lanzalone, G., Lombardo, I., Martel, I., Minniti, T., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Rosato, E., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., Veselsky, M., Vigilante, M., and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, VII. Equation of State of Neutron-Rich Nuclear Matter, Clusters in Nuclei and Nuclear, Isotope, QC1-999, Alpha particle, Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, Physics and Astronomy (all), Excited state, 0103 physical sciences, Nuclear Thermodynamics, Heavy ion collisions, Isospin, Particle, Invariant mass, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.ISBN: 978-88-7438-101-2; International audience; Two and multi particle correlations from the decay of sources produced in 12C+24Mg and 12C+208Pb collisions at E=35 AMeV have been studied by using the forward part (1° < θlab < 30°) of the CHIMERA multi-detector. Correlations and invariant mass spectroscopy are used to explore simultaneous and sequential decays of resonances in light isotopes with Z∼3-6, produced in peripheral collisions via the break-up of excited quasi-projectiles. Among them we mention 5Li, 6Li, 6Be, 8Be and the astrophysically important state in 12C decaying into three alpha particles. Results and future perspectives at the INFN-LNS will be presented.

Published
2016

42. Study of resonances produced in Heavy Ion Collisions

Author

M. Trimarchi, A. Pagano, E. V. Pagano, E. De Filippo, N. S. Martorana, A. Trifirò, F. Rizzo, F. Porto, Giuseppe Verde, Michele Papa, S. Pirrone, L. Acosta, Martin Veselsky, Ismael Martel, G. Lanzalone, Lucrezia Auditore, P. Russotto, B. Gnoffo, A. Chbihi, F. Favela, G. Politi, L. Quattrocchi, G. Cardella, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, Physics and Astronomy (all), 010308 nuclear & particles physics, 0103 physical sciences, Heavy ion, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Computer Science Applications, Education
Abstract

International audience; At Laboratori Nazionali del Sud of Catania an experiment has been carried out in order to investigate the correlations between particles produced in 12C+24Mg reaction at 35 AMeV incident energy. Two α correlation has been explored because provide information about temperature of 8Be nuclei produced in the reaction, while three α correaltion has been studied in order to evaluate the competition between sequential and direct decay mode of resonances produced in 12C quasi-projectiles.

Published
2017

43. Study of the $^{78,86}$Kr$+^{40,48}$Ca Reactions at 10 $A$ MeV: Comparison with Theoretical Models

Author

B. Borderie, P. Russotto, E. Geraci, G. Spadaccini, Michele Papa, J.D. Frankland, F. Amorini, A. Pagano, G. Cardella, Eric Bonnet, M. La Commara, M. Trimarchi, E. V. Pagano, K. Mazurek, Lucrezia Auditore, E. La Guidara, Giuseppe Verde, F. Rizzo, S. Pirrone, Antonio D'Onofrio, Antonio Trifiro, N. Le Neindre, L. Quattrocchi, A. Chbihi, Maria Colonna, Elio Rosato, E. De Filippo, E. Piasecki, B. Gnoffo, G. Politi, P. Lautesse, Sh. A. Kalandarov, J.P. Wieleczko, G. Lanzalone, C. Beck, Mariano Vigilante, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Trimarchi, M., Pirrone, S., Politi, G., Gnoffo, B., Wieleczko, J. P., La Commara, M., De Filippo, E., Russotto, P., Vigilante, M., Colonna, M., Kalandarov, Sh. A., Amorini, F., Auditore, L., Beck, C., Bonnet, E., Borderie, B., Cardella, G., Chbihi, A., D'Onofrio, A., Frankland, J., Geraci, E., La Guidara, E., Lanzalone, G., Lautesse, P., Le Neindre, N., Mazurek, K., Pagano, A., Pagano, E. V., Papa, M., Piasecki, E., Quattrocchi, L., Rizzo, F., Rosato, E., Spadaccini, G., Trifirò, A., and Verde, G.

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Theoretical models, Mode (statistics), General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, Physics and Astronomy (all), Low energy, medicine.anatomical_structure, Isotopic ratio, Isospin, medicine, Nuclear fusion, Nucleus
Abstract

International audience; In heavy-ion collisions at low energy, the decay mode of the compound nucleus formed in fusion reactions can be strongly influenced by the isospin degree of freedom, strictly connected to the isotopic ratio N/Z of the system. The competition among the disintegration modes of 118,134Ba∗ produced in 78,86Kr+40,48Ca reactions at 10 A MeV has been studied in the framework of the ISODEC experiment, and experimental data have been compared with the prediction of GEMINI++ and DiNuclear System (DNS) models.

Published
2017

44. 'NECKLACE' CLUSTER FRAGMENTATION OF THE DINUCLEAR SYSTEM IN DISSIPATIVE REACTIONS

Author

Giuseppe Verde, S. Pirrone, M. J. Quinlan, A. Pagano, H. Singh, E. De Filippo, Jan Toke, G. Cardella, P. Russotto, Antonio Trifiro, F. Rizzo, W. U. Schröder, E. Henry, I. Pawelczak, C. Maiolino, Michele Papa, G. Lanzalone, M. B. Chatterjee, S. Nyibule, Lucrezia Auditore, and G. Politi

Subjects
Chemical physics, Chemistry, Cluster (physics), Fragmentation (computing), Dissipative system, Necklace
Published
2017

45. Present status of the FARCOS detection system

Author

S. Pirrone, Chiara Guazzoni, Luis Acosta, L. Quattrocchi, G. Passaro, G. Salemi, G. Lanzalone, G. Cardella, F. Rizzo, G. Sacca, B. Gnoffo, A. Grimaldi, E. V. Pagano, N. Giudice, Andrea Castoldi, Lucrezia Auditore, E. De Filippo, N. S. Martorana, F. Favela, P. Russotto, T. Parsani, G. Politi, S. Norella, S. De Luca, C. Boiano, F. Librizzi, M. D'Andrea, C. Maiolino, S. Maffessanti, F. Fichera, D. Sciliberto, Michele Papa, A. Trifirò, A. Pagano, Fabio Previdi, and M. Trimarchi

Subjects
Nuclear and High Energy Physics, Preamplifier, STRIPS, Scintillator, 01 natural sciences, 030218 nuclear medicine & medical imaging, law.invention, Telescope, 03 medical and health sciences, 0302 clinical medicine, Optics, Settore ING-INF/04 - Automatica, law, Nuclear Medicine and Imaging, 0103 physical sciences, Instrumentation, Radiology, Nuclear Medicine and Imaging, detectors, Physics, Calorimeter (particle physics), 010308 nuclear & particles physics, business.industry, Nuclear science, Attenuation length, Instrumentation, Radiology, Nuclear Medicine and Imaging, Nuclear and High Energy Physics, Full width at half maximum, business, Radiology, Energy (signal processing)
Abstract

Few years ago we proposed a novel detection system textbf- named FARCOS (Femtoscopy ARray for COrrelations andSpectroscopy) – to target different open cases in nuclear physics. The basic cluster unit of the FARCOS array is a telescope structure with an active area of $6.4 \times 6.4$ cm$^{\mathbf {2}}$ composed of three detection stages. The first two detection layers are DC-coupled Double-Sided Silicon Strip Detectors (DSSSDs), 300 $\mu \textbf{m}$ thick and 1500 $\mu \textbf{m}$ thick, featuring $32 \times 32$ orthogonal strips. The third stage, acting as calorimeter, is composed of four truncated pyramids of CsI(Tl) crystals with an active area of $3.2 \times 3.2$ cm$^{\mathbf {2\, }}$textbfand an absorption length of 6 cm arranged in window configuration. The final system will be a modular assembly of 20 telescopes.A key feature of FARCOS is the identification of the particles stopping even in the first detection layer, relying on pulse shape analysis techniques. The FARCOS frontend electronics features a full scale energy range up to 2 GeV with 5 different selectable ranges and an energy resolution down to 10 keV FWHM with a power budget of about 10 mW/channel in the case of the lower full scale energy range. Its core is a custom multichannel charge preamplifier VLSI chip.The system performance has been extensively qualified on few workhorses in view of the assembly of the final telescopes foreseen for 2018.

Published
2017

46. A new method for the determination of very small Γγ partial widths

Author

G. Lanzalone, P. Russotto, B. Fornal, E. V. Pagano, G. Cardella, Angelo Pagano, Luis Acosta, Saverio De Luca, M. Papa, Nicla Gelli, Enrico De Filippo, S. Pirrone, A. Nannini, Antonio Trifiro, Lucia Quattrocchi, F. Rizzo, Francisco Favela, Concetta Maiolino, Sebastianella Norella, Domenico Santonocito, A. Camaiani, F. Porto, N. S. Martorana, S. Leoni, Lucrezia Auditore, Giuseppe Politi, B. Gnoffo, and Marina Trimarchi

Subjects
Physics, Partial width, 010308 nuclear & particles physics, QC1-999, Detector, Residual, 01 natural sciences, Nuclear physics, Physics and Astronomy (all), medicine.anatomical_structure, 0103 physical sciences, medicine, 010306 general physics, Nucleus, Beam (structure)
Abstract

We present a new method for the measurement of very small Γ γ partial width that is important for the synthesis of elements in astrophysics. The method is based on the simultaneous detection of scattered beam, residual nucleus and decay γ rays. This method is optimized for the use of the CHIMERA detector at LNS. Experimental details are described.

Published
2017

47. Probing the Symmetry Term of the Nuclear Equation of State at High Baryonic Densities

Author

M. Trimarchi, A. Chbihi, Piotr Pawłowski, G. Lanzalone, Riccardo Introzzi, Roy Crawford Lemmon, S. Kupny, Yongjia Wang, Z. Matthews, F. Amorini, Marielle Chartier, M. Zoric, J. Brzychczyk, Chiara Guazzoni, F. Rizzo, N. Kurz, H. H. Wolter, Matthias Heil, M. Al-Garawi, D. M. Rossi, Zbigniew Sosin, P. Z. Wu, Maria Colonna, A. Budzanowski, Qingfeng Li, Yassid Ayyad, W. G. Lynch, Abdulrahman Alajlan, F. Porto, M. Mostazo, Sherry Yennello, Herbert A. Simon, P. Wigg, Giuseppe Verde, P. Cammarata, Lauren Heilborn, D. G. Sarantites, S. Al-Homaidhi, E. V. Pagano, S. Santoro, Mariano Vigilante, W. Reviol, A. Pagano, P. Guazzoni, S. Pirrone, L. Stuhl, T. Isobe, E. La Guidara, P. Lasko, K. Kezzar, J. Łukasik, L. Zetta, P. Russotto, L. Grassi, Michael Famiano, J. Benlliure, A. Wieloch, M. Boisjoli, I. Skwirczyńska, W. Trautmann, S. Gannon, Igor Gašparić, Jack Winkelbauer, Elio Rosato, A. Le Fèvre, Thomas Aumann, M. Kiš, P. Zambon, Z. Chajecki, Michele Papa, M. Adamczyk, Ivano Lombardo, M. B. Tsang, M. D. Cozma, A. Trifirò, Martin Veselsky, F. Riccio, Luis Acosta, Yvonne Leifels, E. De Filippo, K. Boretzky, L. W. May, Lucrezia Auditore, C. Caesar, G. Politi, M. Di Toro, B. Czech, Attila Krasznahorkay, G. Cardella, Paola Marini, Triestino Minniti, Zoran Basrak, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gannon, S., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, Linear density, History, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Computer Science Applications, Education, Term (time), Nuclear physics, Baryon, Physics and Astronomy (all), symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, Quantum electrodynamics, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

International audience; In the ASY-EOS experiment flows of neutrons and light charged particles were measured for (197)Au+(197)Au collisions at 400 MeV/nucleon, in order to investigate the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. By comparing the experimental data with the UrQMD transport model predictions, we have extracted a new constraint in agreement with the moderately soft to linear density dependence obtained in the former analysis on FOPI-LAND data, but reducing the associated uncertainty by a factor ∼ 2.

Published
2017

48. Experimental Studies of the Structure of ^{;;; ; 16};;; ; C with Reactions at Intermediate Energy

Author

Giuseppe Verde, S. Pirrone, S. De Luca, L. Francalanza, E. V. Pagano, Ivano Lombardo, D. Dell'Aquila, M. Trimarchi, S. Norella, E. De Filippo, N. S. Martorana, P. Russotto, Antonio Trifiro, L. Quattrocchi, Michele Papa, Mariano Vigilante, G. Lanzalone, A. Pagano, F. Rizzo, Lucrezia Auditore, G. Politi, L. Acosta, B. Gnoffo, G. Cardella, Dell'Aquila, Daniele, Acosta, L., Auditore, L., Cardella, G., De Filippo, E., De Luca, S., Francalanza, L., Gnoffo, B., Lanzalone, G., Lombardo, I., Martorana, N. S., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Pirrone, S., Politi, G., Quattrocchi, L., Rizzo, F., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 010308 nuclear & particles physics, Excitation energy, Cluster structure, Cocktail beam, Intermediate energies, Invariant mass, Multi-detectors, Reaction intermediates, Nuclear Theory, Structure (category theory), General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Physics and Astronomy (all), Intermediate energy, Chemical physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment
Abstract

International audience; The possible existence of cluster structures in 16C has been investigated by inspecting their breakup (induced on CH2 targets) in 10Be+6He events. The excitation energy of the projectile nucleus prior to decay is obtained via an invariant mass analysis of identified fragments. The experiment has been carried out at the FRIBs facility of INFN-LNS, by using a fragmentation cocktail beam at intermediate energies (≈ 55 MeV/nucleon) and the CHIMERA 4π multi-detector. A non-vanishing yield in the 10Be+6He correlations is reported at an excitation energy of about 20.5 MeV in 16C, in analogy with previous works. To improve these results, we recently performed a new experiment by coupling CHIMERA and FARCOS at forward angles. Preliminary details of the new experiment are reported in the text.

Published
2017

49. Mapping the GDR Quenching in Nuclei of Mass $A=120$--132

Author

G. Cardella, S. Pirrone, R. Alba, G. Bellia, R. Coniglione, E. La Guidara, Michele Papa, O. Wieland, P. Piattelli, E. De Filippo, Domenico Santonocito, Paolo Sapienza, C. Maiolino, H. X. Huang, M. Trimarchi, E. Migneco, Y. Blumenfeld, Antonio Trifiro, Lucrezia Auditore, A. Del Zoppo, C. Monrozeau, F. Rizzo, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Physics and Astronomy (all), Quenching (fluorescence), [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, 0103 physical sciences, General Physics and Astronomy, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

International audience; A comprehensive study of the evolution of the GDR properties from E∗ = 150 MeV to E∗ = 430 MeV has been undertaken in nuclei of mass A = 120 ÷ 132. The experimental investigation was performed using MEDEA detector. An onset of a quenching of the GDR gamma yield was found at E∗ = 270 MeV comparing the experimental gamma-ray spectrum with statistical model calculation. The quenching effect increases at E∗ = 330 MeV and is even more pronounced when the analysis is extended to higher excitation energies using data from previously performed experiments. The comparison with phenomenological models describing the quenching phenomenon gives a qualitative explanation for the effect but is not able to reproduce its detailed features as a function of excitation energy. A smooth cut-off approach describes reasonably well the progressive disappearance of the dipole strength, which occurs around 220–230 MeV excitation energy, and shows that the GDR quenching is a rather sharp effect.

Published
2019

50. ASY-EOS experiment at GSI

Author

S. Pirrone, Riccardo Introzzi, D. Loria, J. Brzychczyk, F. Amorini, Chiara Guazzoni, Marielle Chartier, Triestino Minniti, M. Trimarchi, A. Budzanowski, H. H. Wolter, L. W. May, M. Di Toro, M. Al-Garawi, M. Zoric, B. Tsang, B. Czech, L. Grassi, Z. Chajecki, E. La Guidara, C. Boisjoli, P. Z. Wu, Matthias Heil, Rene Reifarth, G. Politi, Yassid Ayyad, Martin Veselsky, K. Boretzky, Paola Marini, G. Cardella, F. Porto, P. Guazzoni, F. Riccio, Michael Famiano, J. Lukasik, Maria Colonna, Vincenzo Greco, Yvonne Leifels, A. Gašsparić, A. Trifirò, E. Geraci, I. Skwirczyńska, W. Reisdorf, L. Acosta, P. Zambon, A. Le Fèvre, Lauren Heilborn, Michele Papa, M. Adamczyk, Lucrezia Auditore, P. Cammarata, Thomas Aumann, Mihai Petrovici, Z. Basrak, A. Chbihi, Ivano Lombardo, Piotr Pawłowski, S. Cavallaro, Z. Matthews, M. Mostazo, P. Russotto, J. Wilczyński, S. Santoro, P. Lasko, Tadaaki Isobe, F. Rizzo, V. Baran, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, Mariano Vigilante, W. Trautmann, G. Lanzalone, W. G. Lynch, M. Kiš, J. Benlliure, Elio Rosato, S. Al-Homaidhi, C. Boiano, A. Wieloch, Angelo Pagano, E. De Filippo, Abdulrahman Alajlan, Roy Crawford Lemmon, S. Kupny, Sherry Yennello, N. Kurz, L. Zetta, Herbert A. Simon, P. Wigg, K. Kezzar, Giuseppe Verde, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), J.D Frankland, A. Pagano, S. Pirrone, M.-F Rivet, F. Rizzo, J.D.Frankland, A.Pagano, S.Pirrone, m.F.Rivet, F.Rizzo, P., Russotto, L., Acosta, M., Adamczyk, A., Al Ajlan, M., Al Garawi, S., Al Homaidhi, F., Amorini, L., Auditore, T., Aumann, Y., Ayyad, V., Baran, Z., Basrak, J., Benlliure, C., Boiano, C., Boisjoli, K., Boretzky, J., Brzychczyk, A., Budzanowski, G., Cardella, P., Cammarata, S., Cavallaro, Z., Chajecki, M., Chartier, A., Chbihi, M., Colonna, B., Czech, E., De Filippo, M., Di Toro, M., Famiano, A., Le Fevre, A., Ga??spari??, E., Geraci, L., Grassi, V., Greco, C., Guazzoni, P., Guazzoni, M., Heil, L., Heilborn, R., Introzzi, T., Isobe, K., Kezzar, M., Ki??, S., Kupny, N., Kurz, E., La Guidara, G., Lanzalone, P., Lasko, Y., Leifel, R., Lemmon, Q., Li, Lombardo, Ivano, D., Loria, J., Lukasik, W. G., Lynch, P., Marini, Z., Matthew, L., May, T., Minniti, M., Mostazo, A., Pagano, M., Papa, P., Pawlowski, M., Petrovici, S., Pirrone, G., Politi, F., Porto, R., Reifarth, W., Reisdorf, F., Riccio, F., Rizzo, Rosato, Elio, D., Rossi, S., Santoro, H., Simon, I., Skwirczynska, Z., Sosin, W., Trautmann, A., Trifirò, M., Trimarchi, B., Tsang, M., Veselsky, G., Verde, Vigilante, Mariano, A., Wieloch, P., Wigg, J., Wilczynski, H. H., Wolter, P., Wu, S., Yennello, P., Zambon, L., Zetta, M., Zoric, Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Cavallaro, S., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Le Fevre, A., Gašparić, I., Geraci, E., Grassi, L., Greco, V., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Leifels, Y., Lemmon, R., Li, Q., Lombardo, I., Loria, D., Lukasik, J., Lynch, W., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pawlowski, P., Petrovici, M., Pirrone, S., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Simon, H., Skwirczynska, I., Sosin, Z., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, B., Veselsky, M., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wilczynski, J., Wolter, H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, sezele, QC1-999, Nuclear Theory, symmetry energy, Observable, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear equation of state, Symmetry (physics), Term (time), Nuclear physics, Physics and Astronomy (all), nucleus-nucleus collisions, Neutron, Nucleon, Nuclear Experiment
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich Heavy-Ion at intermediate energies has been recently proposed as an observable sensitive to the strength of the symmetry term in the nuclear equation of state (EOS) at supra-saturation densities. The recent results obtained from the existing FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but suffer from a considerable statistical uncertainty. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration in May 2011. © Owned by the authors, 2012.

Published
2012

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