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321 results on '"C., Maiolino"'

1. 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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2. 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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3. 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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4. 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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5. Dipolar degrees of freedom and Isospin equilibration processes in Heavy Ion collisions

Author

Papa, M., Berceanu, I., Acosta, L., Amorini, F., Agodi, C., Anzalone, A., Auditore, L., Cardella, G., Cavallaro, S., Chatterjee, M. B., De Filippo, E., Francalanza, L., Geraci, E., Grassi, L., Gnoffo, B., Han, J., La Guidara, E., Lanzalone, G., Lombardo, I., Pagano, C. Maiolino T. Minniti A., Pagano, E. V., Pirrone, S., Politi, G., Porto, F., Quattrocchi, L., Rizzo, F., Rosato, E., Russotto, P., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Subjects
Nuclear Experiment
Abstract

Background: In heavy ion collision at the Fermi energies Isospin equilibration processes occur- ring when nuclei with different charge/mass asymmetries interacts have been investigated to get information on the nucleon-nucleon Iso-vectorial effective interaction. Purpose: In this paper, for the system 48Ca +27 Al at 40 MeV/nucleon, we investigate on this process by means of an observable tightly linked to isospin equilibration processes and sensitive in exclusive way to the dynamical stage of the collision. From the comparison with dynamical model calculations we want also to obtain information on the Iso-vectorial effective microscopic interaction. Method: The average time derivative of the total dipole associated to the relative motion of all emitted charged particles and fragments has been determined from the measured charges and velocities by using the 4? multi-detector CHIMERA. The average has been determined for semi- peripheral collisions and for different charges Zb of the biggest produced fragment. Experimental evidences collected for the systems 27Al+48Ca and 27Al+40Ca at 40 MeV/nucleon used to support this novel method of investigation are also discussed., Comment: Submitted for publication on Phys. Rev. C. 0n 24-oct-2014

Published
2015
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6. Exploring the astrophysical energy range of the 27Al(p,α)24Mg reaction: A new recommended reaction rate

Author

M. La Cognata, S. Palmerini, P. Adsley, F. Hammache, A. Di Pietro, P. Figuera, R. Alba, S. Cherubini, F. Dell'Agli, G.L. Guardo, M. Gulino, L. Lamia, D. Lattuada, C. Maiolino, A. Oliva, R.G. Pizzone, P.M. Prajapati, S. Romano, D. Santonocito, R. Spartá, M.L. Sergi, and A. Tumino

Subjects
Nuclear astrophysics, Nuclear abundances, Evolved stars, Nuclear reaction cross sections, Physics, QC1-999
Abstract

The 26Al abundance holds a special role in present-day astrophysics, since it is a probe of active nucleosynthesis in the Galaxy and a valuable constraint of Galactic core-collapse supernovae rate. It is estimated through the detection of the 1809-keV γ-line of the daughter 26Mg and from the superabundance of 26Mg in comparison with the most abundant 24Mg isotope in meteorites. Accurate knowledge of the reaction rates involving 26Al, its stable counterpart 27Al and 24Mg is then mandatory. Moreover, these nuclei enter the MgAl cycle playing an important role in the production of Al and Mg isotopes. Recently, high-resolution stellar surveys have shown that the Mg-Al anti-correlation in red giants of globular clusters may hide the existence of multiple stellar populations, and that the relative abundances of Mg isotopes may not show correlation with Al.The common thread running through these astrophysical scenarios is the 27Al(p,α)24Mg reaction, which is the main 27Al destruction channel and directly correlates its abundance with the 24Mg one. Since available reaction rates show an order of magnitude uncertainty owing to the vanishingly small cross section at astrophysical energies, we have applied the Trojan Horse Method to deduce the reaction rate with no need of extrapolation. The indirect measurement made it possible to assess the contribution of the 84-keV resonance and to lower the upper limits on the strength of nearby resonances, with potential important impact for astrophysics. In particular, modifications in the 27Al and 24Mg abundances up to ∼30% are predicted for intermediate mass stars.

Published
2022
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7. 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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8. 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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9. 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. Study of the 12C +16 O fusion reaction in carbon burning via the Trojan Horse Method

Author

A. A. Oliva, A. Tumino, N. Soic, P. M. Prajapati, L. Acosta, R. Alba, F. Barba, S. Cherubini, G. D’Agata, D. Dell’Aquila, A. Di Pietro, J.P. Fernandez, P. Figuera, D. Galaviz Redondo, L. Guardo, M. Gulino, F. Hammache, D. Jelavic Malenica, A.I. Kiliç, M. La Cognata, M. La Commara, L. Lamia, D. Lattuada, C. Maiolino, G. Manicò, M. Mazzocco, M. Milin, Ma Nanru, A. Nurmukhanbetova, D. Nurkic, S. Palmerini, T. Parascandolo, D. Pierroutsakou, R.G. Pizzone, R. Popocovski, G.G. Rapisarda, S. Romano, D. Santonocito, M.L. Sergi, A. Shotter, R. Spartà, A. Spiridon, L. Trache, N. Vukman, and H. Yamaguchi

Subjects
General Medicine
Abstract

12C +12 C is the main reaction during core and shell carbon burning in massive stars, however, at temperatures higher than 109K when most of the carbon is depleted and its abundance is lower than 16O, the 12C +16 O fusion can also become relevant. Moreover, 12C +16 O reaction can ignite also in the scenario of explosive carbon burning. The astrophysical energy region of interest thus ranges from 3 to 7.2 MeV in the center-of-mass frame. There are various measurements of the cross-section available in the literature, however, they all stop around 4 MeV, making extrapolation necessary at lower energies. To try to solve this uncertainty and corroborate direct measurement the Trojan Horse Method was applied to three-body processes 16O(14N, α24Mg)2H and 16O(14N, p27Al)2H to study the 16O(12C, α)24Mg and 16O(12C, p)27Al reactions.

Published
2023

11. The 12C +16 O fusion reaction in carbon burning: Study at energies of astrophysical interest using the Trojan Horse Method

Author

A.A. Oliva, A. Tumino, N. Soic, M.P. Prajapati, L. Acosta, R. Alba, F. Barba, S. Cherubini, G. D’Agata, D. Dell’Aquila, A. Di Pietro, P.J. Fernandez, P. Figuera, D. Galaviz Redondo, L. Guardo, M. Gulino, F. Hammache, D. Jelavic Malenica, A.I. Kiliç, M. La Cognata, M. La Commara, L. Lamia, D. Lattuada, C. Maiolino, G. Manicò, M. Mazzocco, M. Milin, Ma Nanru, A. Nurmukhanbetova, D. Nurkic, S. Palmerini, T. Parascandolo, D. Pierroutsakou, R.G. Pizzone, R. Popocovski, G.G. Rapisarda, S. Romano, D. Santonocito, M.L. Sergi, A. Shotter, R. Spartà, A. Spiridon, L. Trache, N. Vukman, and H. Yamaguchi

Abstract

The carbon-burning process in massive stars mainly occurs via the 12C +12 C. However, at temperatures higher than 109K and considering the increased abundance of 16O produced during the later stages of the heliumburning,the 12C+16O fusion can also become relevant. Moreover, 12C+16O also plays a role in the scenario of explosive carbon burning. Thus, the astrophysical energy region of interest ranges from 3 to 7.2 MeV in the center-of-mass frame. However, the various measurements of the cross-section available in the literature stop around 4 MeV, making extrapolation necessary. To solve this uncertainty and corroborate direct measurement we applied the Trojan Horse Method to three-body processes 16O(14N, α24Mg)2H and 16O(14N, p27Al)2H to study the 12C(16O, α)24Mg and 12C(16O, p)27Al reactions in their entire energy region of astrophysical interest. In this contribution, after briefly describing the method used, the experiment and the preliminary phases of the data analysis will be presented and discussed.

Published
2023

12. Dynamical dipole excitation in the fission of a Ca40 + Sm152 composite system

Author

C. Parascandolo, D. Pierroutsakou, R. Alba, A. Del Zoppo, C. Maiolino, D. Santonocito, C. Agodi, V. Baran, A. Boiano, M. Colonna, R. Coniglione, E. De Filippo, A. Di Nitto, U. Emanuele, F. Farinon, A. Guglielmetti, G. Inglima, M. La Commara, G. La Rana, B. Martin, C. Mazzocchi, M. Mazzocco, C. Rizzo, M. Romoli, M. Sandoli, C. Signorini, R. Silvestri, F. Soramel, A. Trifirò, M. Trimarchi, and E. Vardaci

Published
2022

13. 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

14. A New Reaction Rate of the 27Al(p,α)24Mg Reaction Based on Indirect Measurements at Astrophysical Energies and Implications for 27Al Yields of Intermediate-mass Stars

Author

M. La Cognata, S. Palmerini, P. Adsley, F. Hammache, A. Di Pietro, P. Figuera, F. Dell’Agli, R. Alba, S. Cherubini, G. L. Guardo, M. Gulino, L. Lamia, D. Lattuada, C. Maiolino, A. Oliva, R. G. Pizzone, P. M. Prajapati, G. G. Rapisarda, S. Romano, D. Santonocito, R. Spartá, M. L. Sergi, A. Tumino, and P. Ventura

Subjects
Space and Planetary Science, Astronomy and Astrophysics
Abstract

The abundance of 26Al carries a special role in astrophysics, since it probes active nucleosynthesis in the Milky Way and constrains the Galactic core-collapse supernovae rate. It is estimated through the detection of the 1809 keV γ-line and from the superabundance of 26Mg in comparison with the most abundant Mg isotope (A = 24) in meteorites. For this reason, high precision is necessary also in the investigation of the stable 27Al and 24Mg isotopes. Moreover, these nuclei enter the so-called MgAl cycle, playing an important role in the production of Al and Mg. Recently, high-resolution stellar surveys have shown that the Mg–Al anticorrelation in red-giant stars in globular clusters may hide the existence of multiple stellar populations, and that the relative abundances of Mg isotopes may not be correlated with Al. The common thread running through these astrophysical scenarios is the 27Al(p,α)24Mg reaction, which is the main 27Al destruction channel and directly correlates its abundance with the 24Mg one. Since available reaction rates show large uncertainties owing to the vanishingly small cross section at astrophysical energies, we have applied the Trojan Horse Method to deduce the reaction rate with no need of extrapolation. The indirect measurement made it possible to assess the contribution of the 84 keV resonance and to lower upper limits on the strength of nearby resonances. In intermediate-mass AGB stars experiencing hot bottom burning, a sizeable increase in surface aluminum abundance is observed at the lowest masses, while 24Mg is essentially unaffected by the change in the reaction rate.

Published
2022

15. 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

16. 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

18. The $$^{27}\hbox {Al}(\hbox {p},\alpha )^{24}\hbox {Mg}$$ reaction at astrophysical energies studied by means of the Trojan Horse Method applied to the $$^2\hbox {H}(^{27}\hbox {Al},\alpha ^{24}\hbox {Mg})\hbox {n}$$ reaction

Author

G. Manicò, M. L. Sergi, E. Chávez, R. Alba, J. Mrazek, G. D’Agata, A. Cvetinović, S. Hayakawa, Fairouz Hammache, G. G. Kiss, T. Parascandolo, Luis Acosta, K. Gaitán De Los Rios, Domenico Santonocito, Roberta Spartà, Catalin Matei, Silvio Cherubini, G. G. Rapisarda, Sara Palmerini, Livio Lamia, A. Tumino, T. Petruse, D. Pierroutsakou, M. Mazzocco, R. G. Pizzone, V. Burjan, M. La Commara, N. de Séréville, M. La Cognata, Zsolt Fülöp, Marisa Gulino, P. Figuera, G. L. Guardo, H. Yamaguchi, A. Di Pietro, S. Romano, and C. Maiolino

Subjects
Physics, Reaction rate, Potential impact, Hydrogen, chemistry, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Nuclear fusion, Production (computer science), Energy (signal processing)
Abstract

The $$^{27}\hbox {Al}(\hbox {p},\alpha )^{24}\hbox {Mg}$$ 27 Al ( p , α ) 24 Mg reaction, which drives the destruction of $$^{27}$$ 27 Al and the production of $$^{24}\hbox {Mg}$$ 24 Mg in stellar hydrogen burning, has been investigated via the Trojan Horse Method (THM), by measuring the $$^2\hbox {H}(^{27}\hbox {Al},\alpha ^{24}\hbox {Mg})\hbox {n}$$ 2 H ( 27 Al , α 24 Mg ) n three-body reaction. The experiment covered a broad energy range ($$E_\mathrm{c.m.}\le \,1.5\,\hbox {MeV}$$ E c . m . ≤ 1.5 MeV ), aiming to investigate those of interest for astrophysics. The results confirm the THM as a valuable technique for the experimental study of fusion reactions at very low energies and suggest the presence of a rich pattern of resonances in the energy region close to the Gamow window of stellar hydrogen burning (70–120 keV), with potential impact on astrophysics. To estimate such an impact a second run of the experiment is needed, since the background due the three-body reaction hampered to collect enough data to resolve the resonant structures and extract the reaction rate.

Published
2021

19. 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

20. The FAZIA setup: A review on the electronics and the mechanical mounting

Author

F. Gramegna, M.F. Rivet, M. Falorsi, A. Zucchini, R. Revenko, J.D. Frankland, F. Saillant, J. Ropert, H. de Préaumont, S. Serra, Silvia Piantelli, P. Lecomte, J. A. Dueñas, D. Dell'Aquila, Y. Merrer, A. Chbihi, O. Lopez, N. Le Neindre, M. Pârlog, L. Grassi, G. Pastore, Giacomo Poggi, E. Vient, G. Mantovani, E. Scarlini, Gabriele Pasquali, M. Henri, G. Tortone, Alessandro Olmi, C. Maiolino, Giovanni Casini, Giuseppe Verde, C. Pain, P. Edelbruck, Eric Bonnet, Marek Palka, G. Spadaccini, A. Ordine, D. Fabris, R. Giordano, A. Buccola, C. Ciampi, Domenico Santonocito, E. Galichet, Tomasz Kozik, Krzysztof Korcyl, A. Camaiani, Elio Rosato, Andrea Stefanini, M. Kajetanowicz, B. Bougard, T. Marchi, A. Margotti, Mariano Vigilante, F. Salomon, A. Boiano, M. Cinausero, C. Frosin, R. Bougault, Simone Valdré, R. Alba, A. Richard, C. Soulet, Diego Gruyer, Luca Morelli, G. Brulin, Magda Cicerchia, E. Wanlin, P. Desrues, M. Bruno, I. Lombardo, M. Guerzoni, S. Upadhyaya, Maurizio Bini, A.J. Kordyasz, G. Wittwer, A. Vanzanella, P. Ottanelli, G. Tobia, Sandro Barlini, B. Borderie, Valdre, S., Casini, G., Le Neindre, N., Bini, M., Boiano, A., Borderie, B., Edelbruck, P., Poggi, G., Salomon, F., Tortone, G., Alba, R., Barlini, S., Bonnet, E., Bougard, B., Bougault, R., Brulin, G., Bruno, M., Buccola, A., Camaiani, A., Chbihi, A., Ciampi, C., Cicerchia, M., Cinausero, M., Dell'Aquila, D., Desrues, P., Duenas, J. A., Fabris, D., Falorsi, M., Frankland, J. D., Frosin, C., Galichet, E., Giordano, R., Gramegna, F., Grassi, L., Gruyer, D., Guerzoni, M., Henri, M., Kajetanowicz, M., Korcyl, K., Kordyasz, A., Kozik, T., Lecomte, P., Lombardo, I., Lopez, O., Maiolino, C., Mantovani, G., Marchi, T., Margotti, A., Merrer, Y., Morelli, L., Olmi, A., Ordine, A., Ottanelli, P., Pain, C., Palka, M., Parlog, M., Pasquali, G., Pastore, G., Piantelli, S., de Preaumont, H., Revenko, R., Richard, A., Rivet, M. F., Ropert, J., Rosato, E., Saillant, F., Santonocito, D., Scarlini, E., Serra, S., Soulet, C., Spadaccini, G., Stefanini, A. A., Tobia, G., Upadhyaya, S., Vanzanella, A., Verde, G., Vient, E., Vigilante, M., Wanlin, E., Wittwer, G., Zucchini, A., 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), 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), 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)-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), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), 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), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), 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 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), 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), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, data acquisition, Telescope array, Nuclear physics, Measure (physics), FOS: Physical sciences, FAZIA, Heavy-ion reaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Front end electronics, Data acquisition, nuclear physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electronics, Nuclear Experiment (nucl-ex), heavy-ion reactions, 010306 general physics, Nuclear Experiment, Instrumentation, TRACE (psycholinguistics), Physics, 010308 nuclear & particles physics, 29.40.Wk, Instrumentation and Detectors (physics.ins-det), 29.85.Ca, front-end electronics, Heavy-ion reactions, Front-end electronics, telescope array, Nuclear physic, Systems engineering, Front-end electronic
Abstract

In this paper the technological aspects of the FAZIA array will be explored. After a productive commissioning phase, FAZIA blocks started to measure and give very useful data to explore the physics of Fermi energy heavy-ion reactions. This was possible thanks to many technical measures and innovations developed in the commissioning phase and tuned during the first experimental campaigns. This paper gives a detailed description of the present status of the FAZIA setup from the electronic and mechanical point of view, trying also to trace a path for new improvements and refinements of the apparatus., 17 pages, 9 figures

Published
2019

21. 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

22. 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

23. Measurement of the 27Al(p,α)24Mg Reaction at Astrophysical Energies via the Trojan Horse Method

Author

R. Alba, G. G. Kiss, M. La Commara, Livio Lamia, K. De Los Rios, A. Tumino, J. Mrazek, R. G. Pizzone, C. Parascandalo, M. La Cognata, Luis Acosta, A. Di Pietro, Silvio Cherubini, G. L. Guardo, T. Petruze, E. Chávez, C. Spitaleri, S. Romano, G. Manicò, Domenico Santonocito, M. Mazzocco, G. D’ Agata, D. Pierroutsakou, S. Hayakawa, M. Gulino, Sara Palmerini, Roberta Spartà, P. Figuera, G. G. Rapisarda, and C. Maiolino

Subjects
Nuclear physics, Physics, Trojan horse
Published
2020

24. Dynamical fission of the quasiprojectile and isospin equilibration for the system Kr80+Ca48 at 35 MeV/nucleon

Author

G. Mantovani, E. Vient, C. Frosin, Silvia Piantelli, M. Henri, R. Alba, Gabriele Pasquali, S. Upadhyaya, A.J. Kordyasz, J. A. Dueñas, A. Chbihi, M. Degerlier, Akira Ono, Giovanni Casini, Giuseppe Verde, Simone Valdré, Tomasz Kozik, D. Fabris, Giacomo Poggi, Sandro Barlini, Andrea Stefanini, G. Tortone, A. Boiano, M. Cinausero, C. Maiolino, Magda Cicerchia, B. Borderie, A. Buccola, N. Le Neindre, M. D'Agostino, D. Gruyer, O. Lopez, M. Pârlog, T. Marchi, Alessandro Olmi, R. Bougault, J.D. Frankland, Ivano Lombardo, Luca Morelli, G. Pastore, P. Ottanelli, F. Gramegna, Q. Fable, M. Bruno, Mariano Vigilante, A. Camaiani, and Eric Bonnet

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Fission, media_common.quotation_subject, Nuclear Theory, Charge (physics), 7. Clean energy, 01 natural sciences, Asymmetry, Nuclear physics, Isospin, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract

Experimental results concerning the dynamical fission of quasiprojectiles in semiperipheral collisions for the system Kr80+Ca48 at 35 MeV/nucleon are presented. Data have been collected with four blocks of the FAZIA setup in the first physics experiment of the FAZIA Collaboration. The degree of isospin equilibration between the two fission fragments and its dependence on their charge asymmetry is investigated. The data are compared with the results of the AMD model coupled to GEMINI as an afterburner, in order to get hints about the timescale of the process.

Published
2020

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

36. Dynamical fission of the quasiprojectile and isospin equilibration for the system Kr80+Ca48 at 35 MeV/nucleon

Author

S, Piantelli, G, Casini, A, Ono, G, Poggi, G, Pastore, S, Barlini, A, Boiano, E, Bonnet, B, Borderie, R, Bougault, M, Bruno, A, Buccola, A, Camaiani, A, Chbihi, M, Cicerchia, M, Cinausero, M, D'Agostino, M, Degerlier, J, A Dueñas, Q, Fable, D, Fabris, J, D Frankland, C, Frosin, F, Gramegna, D, Gruyer, M, Henri, A, Kordyasz, T, Kozik, N, Le Neindre, I, Lombardo, O, Lopez, G, Mantovani, T, Marchi, L, Morelli, A, Olmi, P, Ottanelli, M., Pârlog, G, Pasquali, A, A Stefanini, G, Tortone, S, Upadhyaya, S, Valdré, G, Verde, E, Vient, M, Vigilante, R, Alba, and C, Maiolino

Published
2020

37. 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

38. 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

39. Pre-equilibrium GDR in a heavy composite system

Author

D. Torresi, Maria Colonna, M. Trimarchi, U. Emanuele, M. Di Toro, A. Boiano, Domenico Santonocito, V. Baran, R. Coniglione, R. Alba, E. De Filippo, C. Rizzo, B. Martin, E. Strano, F. Farinon, D. Pierroutsakou, Francesca Soramel, M. Romoli, M. Mazzocco, A. Guglielmetti, C. Mazzocchi, C. Parascandolo, M. La Commara, C. Signorini, A. Del Zoppo, R. Silvestri, C. Agodi, C. Maiolino, and A. Trifirò

Subjects
Physics, History, Fusion, Fission, media_common.quotation_subject, Evaporation, Charge (physics), Asymmetry, Computer Science Applications, Education, Physics and Astronomy (all), Atomic physics, Nuclear Experiment, Spin (physics), Nucleon, Excitation, media_common
Abstract

The excitation of the Dynamical Dipole mode along the fusion path was investigated for the first time in the formation of a heavy composite system in the A~190 mass region, in fusion-evaporation and fission events. The composite system was formed at identical conditions of excitation energy and spin from two reactions with different charge asymmetry: the charge asymmetric 40Ca + 152Sm and the nearly charge symmetric 48Ca + 144Sm at E lab =11 and 10.1 MeV/nucleon, respectively. In this paper, we report the results on fusion evaporation events and the preliminary analysis on fission channel.

Published
2018

40. 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

41. 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

42. 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

43. 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

44. 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

45. Size and asymmetry of the reaction entrance channel: Influence on the probability of neck production

Author

G. Vannini, P. F. Mastinu, R. Alba, R. Coniglione, G. Bellia, Domenico Santonocito, A. Moroni, Giacomo Vito Margagliotti, C. Maiolino, P. M. Milazzo, E. Migneco, A. Del Zoppo, Paolo Finocchiaro, Paolo Piattelli, C. Agodi, I. Iori, Rinaldo Rui, Paolo Sapienza, F. Gramegna, Nicola Colonna, P. M., Milazzo, G., Vannini, C., Agodi, R., Alba, G., Bellia, N., Colonna, R., Coniglione, A., DEL ZOPPO, P., Finocchiaro, F., Gramegna, I., Iori, C., Maiolino, Margagliotti, Giacomo, P. F., Mastinu, E., Migneco, A., Moroni, P., Piattelli, Rui, Rinaldo, D., Santonocito, P., Sapienza, P.M. Milazzo, G. Vannini, C. Agodi, R. Alba, G. Bellia, N. Colonna, R. Coniglione, A. Del Zoppo, P. Finocchiaro, F. Gramegna, I. Iori, C. Maiolino, G.V. Margagliotti, P.F. Mastinu, E. Migneco, A. Moroni, P. Piattelli, R. Rui, D. Santonocito, and P. Sapienza.

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, Charge density, Asymmetry, medicine.anatomical_structure, medicine, Dissipative system, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon, Nucleus, Excitation, media_common
Abstract

The results of experiments performed to investigate the Ni+Al, Ni+Ni, Ni+Ag reactions at 30 MeV/nucleon are presented. From the study of dissipative midperipheral collisions, it has been possible to detect events in which Intermediate Mass Fragments (IMF) production takes place. The decay of a quasi-projectile has been identified; its excitation energy leads to a multifragmentation totally described in terms of a statistical disassembly of a thermalized system (T$\simeq$4 MeV, E$^*\simeq$4 MeV/nucleon). Moreover, for the systems Ni+Ni, Ni+Ag, in the same nuclear reaction, a source with velocity intermediate between that of the quasi-projectile and that of the quasi-target, emitting IMF, is observed. The fragments produced by this source are more neutron rich than the average matter of the overall system, and have a charge distribution different, with respect to those statistically emitted from the quasi-projectile. The above features can be considered as a signature of the dynamical origin of the midvelocity emission. The results of this analysis show that IMF can be produced via different mechanisms simultaneously present within the same collision. Moreover, once fixed the characteristics of the quasi-projectile in the three considered reactions (in size, excitation energy and temperature), one observes that the probability of a partner IMF production via dynamical mechanism has a threshold (not present in the Ni+Al case) and increases with the size of the target nucleus., 16 pages, 7 figures, accepted for publication on Nuclear Physics A

Published
2005

46. A signal of spinodal decomposition around Fermi energy

Author

Domenico Santonocito, Paolo Piattelli, G. Vannini, M. Bruno, R. Alba, Maria Colonna, K. Loukachine, I. Iori, G. Bellia, Giacomo Vito Margagliotti, E. Migneco, R. Coniglione, P. M. Milazzo, Paolo Finocchiaro, P. F. Mastinu, F. Gramegna, C. Agodi, C. Maiolino, Rinaldo Rui, M. L. Fiandri, A. Moroni, M. D'Agostino, P. Sapienza, Nicola Colonna, A. Del Zoppo, R., Alba, C., Agodi, C., Maiolino, A., Delzoppo, M., Colonna, G., Bellia, R., Coniglione, P., Finocchiaro, K., Loukachine, E., Migneco, P., Piattelli, D., Santonocito, P., Sapienza, M., Bruno, M., Dagostino, M. L., Fiandri, G., Vannini, N., Colonna, F., Gramegna, P. F., Mastinu, I., Iori, A., Moroni, Margagliotti, Giacomo, P. M., Milazzo, Rui, Rinaldo, R. Alba, C. Agodi, C. Maiolino, A. Del Zoppo, M. Colonna, G. Bellia, R. Coniglione, P. Finocchiaro, K. Loukachine, E. Migneco, P. Piattelli, D. Santonocito, P. Sapienza, M. Bruno, M. D'Agostino, M.L. Fiandri, G. Vannini, N. Colonna, F. Gramegna, P.F. Mastinu, I. Iori, A. Moroni, G.V. Margagliotti, P.M. Milazzo, and R. Rui

Subjects
Physics, Nuclear and High Energy Physics, Spinodal, Photon, Component (thermodynamics), Spinodal decomposition, Astrophysics::High Energy Astrophysical Phenomena, IMPACT PARAMETER DEPENDENCE, Fermi energy, Astrophysics::Cosmology and Extragalactic Astrophysics, HEAVY-ION COLLISIONS, Signal, HARD PHOTON PRODUCTION, Thermal, Atomic physics, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

Using thermal photons to tag the reaction time a prompt IMF emission component has been identified in central 58 Ni + 197 Au collisions at 45 MeV/amu. The comparison with theoretical calculations supports the hypothesis of dynamical emission in the spinodal region.

Published
2005

47. Evidence of dynamical dipole excitation in the fusion-evaporation of the 40Ca +152Sm heavy system

Author

C. Parascandolo, D. Pierroutsakou, R. Alba, A. Del Zoppo, C. Maiolino, D. Santonocito, C. Agodi, V. Baran, A. Boiano, M. Colonna, R. Coniglione, E. De Filippo, M. Di Toro, U. Emanuele, F. Farinon, A. Guglielmetti, G. Inglima, B. Martin, C. Mazzocchi, M. Mazzocco, C. Rizzo, M. Romoli, M. Sandoli, C. Signorini, R. Silvestri, F. Soramel, E. Strano, D. Torresi, Trifir, A., O, Trimarchi, M., LA COMMARA, MARCO, C., Parascandolo, D., Pierroutsakou, R., Alba, A. Del, Zoppo, C., Maiolino, D., Santonocito, C., Agodi, V., Baran, A., Boiano, M., Colonna, R., Coniglione, E. De, Filippo, M. Di, Toro, U., Emanuele, F., Farinon, A., Guglielmetti, G., Inglima, LA COMMARA, Marco, B., Martin, C., Mazzocchi, M., Mazzocco, C., Rizzo, M., Romoli, M., Sandoli, C., Signorini, R., Silvestri, F., Soramel, E., Strano, D., Torresi, Trifir, A., O, and Trimarchi, M.

Subjects
nuclear physic, nuclear reaction
Abstract

The excitation of the dynamical dipole mode along the fusion path was investigated for the first time in the formation of a heavy compound nucleus in the A ∼ 190 mass region. The compound nucleus was formed at identical conditions of excitation energy and spin from two entrance channels: the charge-asymmetric 40 Ca + 152 Sm and the nearly charge-symmetric 48 Ca + 144 Sm at E lab = 11 and 10.1 MeV / nucleon, respectively. High-energy γ rays and light charged particles were measured in coincidence with evaporation residues by means of the MEDEA multidetector array (Laboratori Nazionali del Sud, Italy) coupled to four parallel plate avalanche counters. The charged particle multiplicity spectra and angular distributions were used to pin down the average excitation energy, the average mass, and the average charge of the compound nucleus. The γ -ray multiplicity spectrum and angular distribution related to the nearly charge-symmetric channel were employed to obtain new data on the giant dipole resonance in the compound nucleus. The dynamical dipole mode excitation in the charge-asymmetric channel was evidenced, in a model-independent way, by comparing the γ -ray multiplicity spectra and angular distributions of the two entrance channels with each other. Calculations of the dynamical dipole mode in the 40 Ca + 152 Sm channel, based on a collective bremsstrahlung analysis of the reaction dynamics, are presented. Possible interesting implications in the superheavy-element quest are discussed.

Published
2016

48. The FAZIA project in Europe: R&D phase

Author

Zbigniew Sosin, E. Vient, F. Gramegna, Paola Marini, F. Salomon, Mariano Vigilante, G. Ademard, Luca Morelli, Gabriele Pasquali, G. Pastore, A. Ordine, Giovanni Casini, L. Roscilli, M. Falorsi, M. F. Rivet, P. Edelbruck, Ismael Martel, R. Giordano, C. Pain, R. Bougault, H. Petrascu, A. Chbihi, G. Brulin, L. Lavergne, Alessandro Olmi, O. Lopez, M. Pârlog, R. Rocco, A.J. Kordyasz, N. Le Neindre, A. Wieloch, C. Spitaels, G. Spadaccini, L. Bardelli, B. Bougard, S. Energico, E. Vanzanella, J.D. Frankland, Krzysztof Korcyl, R. Alba, A. Meoli, E. Piasecki, E. Bonnet, R. Borcea, M. Boisjoli, J.A. Dueñas, L. Ciolacu, M. Kajetanowicz, J. Łukasik, M. Cruceru, A. Boiano, S. Serra, T. Twaróg, Marek Palka, Piotr Pawłowski, K. Ga̧sior, G. Tobia, F. Negoita, B. De Fazio, E. Scarlini, P. Kulig, Andrea Stefanini, I. Cruceru, C. Huss, E. Wanlin, M. Petcu, B. Borderie, A. Grzeszczuk, Y. Merrer, S. Carboni, Simone Valdré, P. Di Meo, Giacomo Poggi, V. Seredov, A. Vanzanella, W. Zipper, G. Tortone, C. Maiolino, D. Sierpowski, G. Pontoriere, P. Desrues, M. Degerlier, Domenico Santonocito, B. D’Aquino, M. Guerzoni, F. Cassese, E. Galichet, G. Passeggio, Giuseppe Vitiello, A. Anastasio, E. Legouée, M. Cinausero, Sandro Barlini, V. Masone, Maurizio Bini, H. Hamrita, Silvia Piantelli, E. Rauly, G. Paduano, D. Gruyer, E. Rosato, M. Bruno, Tomasz Kozik, S. Barbey, C. Cassese, Tommaso Marchi, R. Bougault, G. Poggi, S. Barlini, B. Borderie, G. Casini, A. Chbihi, N. Le Neindre, M. Pârlog, G. Pasquali, S. Piantelli, Z. Sosin, G. Ademard, R. Alba, A. Anastasio, S. Barbey, L. Bardelli, M. Bini, A. Boiano, M. Boisjoli, E. Bonnet, R. Borcea, B. Bougard, G. Brulin, M. Bruno, S. Carboni, C. Cassese, F. Cassese, M. Cinausero, L. Ciolacu, I. Cruceru, M. Cruceru, B. D’Aquino, B. Fazio, M. Degerlier, P. Desrue, P. Meo, J. A. Dueña, P. Edelbruck, S. Energico, M. Falorsi, J. D. Frankland, E. Galichet, K. Gasior, F. Gramegna, R. Giordano, D. Gruyer, A. Grzeszczuk, M. Guerzoni, H. Hamrita, C. Hu, M. Kajetanowicz, K. Korcyl, A. Kordyasz, T. Kozik, P. Kulig, L. Lavergne, E. Legouée, O. Lopez, J. Łukasik, C. Maiolino, T. Marchi, P. Marini, I. Martel, V. Masone, A. Meoli, Y. Merrer, L. Morelli, F. Negoita, A. Olmi, A. Ordine, G. Paduano, C. Pain, M. Pałka, G. Passeggio, G. Pastore, P. Pawłowski, M. Petcu, H. Petrascu, E. Piasecki, G. Pontoriere, E. Rauly, M. F. Rivet, R. Rocco, E. Rosato, L. Roscilli, E. Scarlini, F. Salomon, D. Santonocito, V. Seredov, S. Serra, D. Sierpowski, G. Spadaccini, C. Spitael, A. A. Stefanini, G. Tobia, G. Tortone, T. Twaróg, S. Valdré, A. Vanzanella, E. Vanzanella, E. Vient, M. Vigilante, G. Vitiello, E. Wanlin, A. Wieloch, W. Zipper, 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)-Centre National de la Recherche Scientifique (CNRS)-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), 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), Conservatoire National des Arts et Métiers [CNAM] (CNAM), FAZIA, R., Bougault, G., Poggi, S., Barlini, B., Borderie, G., Casini, A., Chbihi, N., Le Neindre, M., Pârlog, G., Pasquali, S., Piantelli, Z., Sosin, G., Ademard, R., Alba, A., Anastasio, S., Barbey, L., Bardelli, M., Bini, A., Boiano, M., Boisjoli, E., Bonnet, R., Borcea, B., Bougard, G., Brulin, M., Bruno, S., Carboni, C., Cassese, F., Cassese, M., Cinausero, L., Ciolacu, I., Cruceru, M., Cruceru, B., D’Aquino, DE FAZIO, Benedetto, M., Degerlier, P., Desrue, P., Di Meo, J. A., Dueña, P., Edelbruck, S., Energico, M., Falorsi, J. D., Frankland, E., Galichet, K., Gasior, F., Gramegna, Giordano, Raffaele, D., Gruyer, A., Grzeszczuk, M., Guerzoni, H., Hamrita, C., Hu, M., Kajetanowicz, K., Korcyl, A., Kordyasz, T., Kozik, P., Kulig, L., Lavergne, E., Legouée, O., Lopez, J., Lukasik, C., Maiolino, T., Marchi, P., Marini, I., Martel, V., Masone, A., Meoli, Y., Merrer, L., Morelli, F., Negoita, A., Olmi, A., Ordine, G., Paduano, C., Pain, M., Palka, G., Passeggio, P., Pawlowski, M., Petcu, H., Petrascu, E., Piasecki, G., Pontoriere, E., Rauly, M. F., Rivet, R., Rocco, Rosato, Elio, L., Roscilli, E., Scarlini, F., Salomon, D., Santonocito, V., Seredov, S., Serra, D., Sierpowski, Spadaccini, Giulio, C., Spitael, A. A., Stefanini, G., Tobia, G., Tortone, T., Twaróg, S., Valdré, A., Vanzanella, E., Vanzanella, E., Vient, Vigilante, Mariano, G., Vitiello, E., Wanlin, A., Wieloch, W., Zipper, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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 HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Physics, NUCLEAR REACTIONS, Nuclear and High Energy Physics, Silicon, SCINTILLATION DETECTORS, Physics::Instrumentation and Detectors, Nuclear engineering, Detector, SILICON DETECTORS, chemistry.chemical_element, Reaction products, Nanotechnology, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Particle detector, Particle identification, Semiconductor detector, chemistry, Scintillation counter, Hermetic detector, PARTICLE IDENTIFICATION
Abstract

The goal of the FAZIA Collaboration is the design of a new-generation 4π detector array for heavy-ion collisions with radioactive beams. This article summarizes the main results of the R&D phase, devoted to the search for significant improvements of the techniques for charge and mass identification of reaction products. This was obtained by means of a systematic study of the basic detection module, consisting of two transmission-mounted silicon detectors followed by a CsI(Tl) scintillator. Significant improvements in ΔE-E and pulse-shape techniques were obtained by controlling the doping homogeneity and the cutting angles of silicon and by putting severe constraints on thickness uniformity. Purposely designed digital electronics contributed to identification quality. The issue of possible degradation related to radiation damage of silicon was also addressed. The experimental activity was accompanied by studies on the physics governing signal evolution in silicon. The good identification quality obtained with the prototypes during the R&D phase, allowed us to investigate also some aspects of isospin physics, namely isospin transport and odd-even staggering. Now, after the conclusion of the R&D period, the FAZIA Collaboration has entered the demonstrator phase, with the aim of verifying the applicability of the devised solutions for the realization of a larger-scale experimental set-up.

Published
2014

49. '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

50. 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

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