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1,149 results on '"Cavallaro S."'

1. D-D nuclear fusion processes induced in polyethylene foams by TW Laser-generated plasma

Author

Torrisi L., Cutroneo M., Cavallaro S., and Ullschmied J.

Subjects
Physics, QC1-999
Abstract

Deuterium-Deuterium fusion processes were generated by focusing the 3 TW PALS Laser on solid deuterated polyethylene targets placed in vacuum. Deuterium ion acceleration of the order of 4 MeV was obtained using laser irradiance Iλ2 ∼ 5 × 1016 W μm2/cm2 on the target. Thin and thick targets, at low and high density, were irradiated and plasma properties were monitored “on line” and “off line”. The ion emission from plasma was monitored with Thomson Parabola Spectrometer, track detectors and ion collectors. Fast semiconductor detectors based on SiC and fast plastic scintillators, both employed in time-of-flight configuration, have permitted to detect the characteristic 3.0 MeV protons and 2.45 MeV neutrons emission from the nuclear fusion reactions. From massive absorbent targets we have evaluated the neutron flux by varying from negligible values up to about 5 × 107 neutrons per laser shot in the case of foams targets, indicating a reaction rate of the order of 108 fusion events per laser shot using “advanced targets”.

Published
2015
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2. ASY-EOS experiment at GSI

Author

Kezzar K., Isobe T., Introzzi R., Heilborn L., Heil M., Guazzoni P., Guazzoni C., Greco V., Grassi L., Geraci E., Gašsparić A., Le Fevre A., Famiano M., Di Toro M., De Filippo E., Czech B., Colonna M., Chbihi A., Chartier M., Chajecki Z., Cavallaro S., Cammarata P., Cardella G., Budzanowski A., Brzychczyk J., Boretzky K., Boisjoli C., Boiano C., Benlliure J., Basrak Z., Baran V., Ayyad Y., Aumann T., Auditore L., Amorini F., Al-Homaidhi S., Al-Garawi M., Al-Ajlan A., Adamczyk M., Acosta L., Russotto P., Kiš M., Kupny S., Kurz N., La Guidara E., Lanzalone G., Lasko P., Leifels Y., Lemmon R., Li Q., Lombardo I., Loria D., Lukasik J., Lynch W.G., Marini P., Matthews Z., May L., Minniti T., Mostazo M., Pagano A., Papa M., Pawlowski P., Petrovici M., Pirrone S., Politi G., Porto F., Reifarth R., Reisdorf W., Riccio F., Rizzo F., Rosato E., Rossi D., Santoro S., Simon H., Skwirczynska I., Sosin Z., Trautmann W., Trifirò A., Trimarchi M., Tsang B., Veselsky M., Verde G., Vigilante M., Wieloch A., Wigg P., Wilczynski J., Wolter H.H., Wu P., Yennello S., Zambon P., Zetta L., and Zoric M.

Subjects
Physics, QC1-999
Abstract

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

Published
2012
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3. N/Z effects on 40,48Ca+40,48Ca reactions at 25 MeV/nucleon

Author

Cardella G., Buscemi M., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Acosta L., Lombardo I., Cavallaro S., Chatterjee M. B., DeFilippo E., Giuliani G., Geraci E., Grassi L., Han J., LaGuidara E., Lanzalone G., Loria D., Maiolino C., Minniti T., Pagano A., Papa M., Pirrone S., Politi G., Porto F., Rizzo F., Rosato E., Russotto P., Santoro S., Trifirò A., Trimarchi M., Verde G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

Effects related to the neutron to proton ratio (N/Z) degree of freedom in 40,48Ca+40,48Ca reactions at 25 MeV/nucleon have been investigated. Isotopic effect and even-odd staggering characterize the emission of light fragments at forward angles. The study of isobaric ratio 7Li/7Be for quasi-projectile source in semi-peripheral event of reactions allows moreover to investigate isospin diffusion effects in heavy ion collisions.

Published
2012
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4. Isoscaling in dissipative projectile breakup

Author

Amorini F., Schröder J.D., Henry E., Pawelczak I., Tõoke J., Quinlan M.J., Singh H., Anzalone A., Maiolino C., Auditore L., Loria D., Trifirò A., Trimarchi M., Cardella G., De Filippo E., Pagano A., Papa M., Pirrone S., Verde G., Chatterjee M.B., Cavallaro S., Geraci E., Lo Nigro S., Politi G., Porto F., Rizzo F., Russotto P., Grzeszczuk A., Guazzoni P., Zetta L., La Guidara E., Lanzalone G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

Dynamical breakup of projectile-like fragments (PLF) following dissipative reactions of 48 Ca projectiles with 112 Sn and 124 Sn is shown to exhibit “isoscaling” regularities that can be understood in terms of phase space governed by ground state masses. Ambiguities in isoscaling parameters obscure information on nuclear symmetry energy at subnormal densities.

Published
2012
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5. N/Z effects on evaporation residue emission near fragmentation threshold

Author

Papa M., Pagano A., Minniti T., Maiolino C., Loria D., Lanzalone G., LaGuidara E., Han J., Grassi L., Geraci E., Giuliani G., DeFilippo E., Chatterjee M.B., Cavallaro S., Cardella G., Berceanu I., Auditore L., Anzalone A., Amorini F., Agodi C., Lombardo I., Acosta L., Pirrone S., Politi G., Porto F., Rizzo F., Russotto P., Santoro S., Trifirò A., Trimarchi M., Verde G., and Vigilante M.

Subjects
Physics, QC1-999
Abstract

We will discuss results concerning the fate of hot nuclear systems populated in 40,48Ca+40,48Ca reactions at 25 MeV/nucleon. Due to the complexity of events, we used the Chimera 4π device as detection system. By selecting central events of reaction, we found that the interplay between binary-like and evaporation residue emissions is strongly sensitive on the N/Z of the entrance channels. In particular, evaporation residue emission increases at increasing the neutron content of colliding system. By comparing or data with CoMD-II model calculations, we can extract information about the density depend part of Symmetry Potential in the Nuclear Equation of State at near-saturation densities.

Published
2011
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6. An Immunological Algorithm for Graph Modularity Optimization

Author

Spampinato, A. G., Scollo, R. A., Cavallaro, S., Pavone, M., Cutello, V., Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Ju, Zhaojie, editor, Yang, Longzhi, editor, Yang, Chenguang, editor, Gegov, Alexander, editor, and Zhou, Dalin, editor

Published
2020
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7. 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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8. Correlations between emission timescale of fragments and isospin dynamics in $^{124}$Sn+$^{64}$Ni and $^{112}$Sn+$^{58}$Ni reactions at 35 AMeV

Author

De Filippo, E., Pagano, A., Russotto, P., Amorini, F., Anzalone, A., Auditore, L., Baran, V., Berceanu, I., Borderie, B., Bougault, R., Bruno, M., Cap, T., Cardella, G., Cavallaro, S., Chatterjee, M. B., Chbihi, A., Colonna, M., D'Agostino, M., Dayras, R., Di Toro, M., Frankland, J., Galichet, E., Gawlikowicz, W., Geraci, E., Grzeszczuk, A., Guazzoni, P., Kowalski, S., La Guidara, E., Lanzalone, G., Lanzanò, G., Neindre, N. Le, Lombardo, I., Maiolino, C., Papa, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, G., Pop, A., Porto, F., Rivet, M. F., Rizzo, F., Rosato, E., Schmidt, K., Siwek-Wilczynska, K., Skwira-Chalot, I., Trifirò, A., Trimarchi, M., Verde, G., Vigilante, M., Wieleczko, J. P., Wilczynski, J., Zetta, L., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

We present a new experimental method to correlate the isotopic composition of intermediate mass fragments (IMF) emitted at mid-rapidity in semi-peripheral collisions with the emission timescale: IMFs emitted in the early stage of the reaction show larger values of $<$N/Z$>$ isospin asymmetry, stronger angular anisotropies and reduced odd-even staggering effects in neutron to proton ratio $<$N/Z$>$ distributions than those produced in sequential statistical emission. All these effects support the concept of isospin "migration", that is sensitive to the density gradient between participant and quasi-spectator nuclear matter, in the so called neck fragmentation mechanism. By comparing the data to a Stochastic Mean Field (SMF) simulation we show that this method gives valuable constraints on the symmetry energy term of nuclear equation of state at subsaturation densities. An indication emerges for a linear density dependence of the symmetry energy., Comment: 17 pages, 7 figures; submitted to Physical Rev. C

Published
2012
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9. Isospin Dependence of Incomplete Fusion Reactions at 25 Mev/a

Author

Amorini, F., Cardella, G., Giuliani, G., Papa, M., Agodi, C., Alba, R., Anzalone, A., Berceanu, I., Cavallaro, S., Chatterjee, M. B., Coniglione, R., De Filippo, E., Di Pietro, A., Geraci, E., Grassi, L., Grzeszczuk, A., Figuera, P., La Guidara, E., Lanzalone, G., Neindre, N. Le, Lombardo, I., Maiolino, C., Pagano, A., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., Sapienza, P., and Verde, G.

Subjects
Nuclear Experiment
Abstract

40Ca+40,48Ca,46Ti reactions at 25 MeV/A have been studied using the 4p CHIMERA detector. An isospin effect on the competition between incomplete fusion and dissipative binary reaction mechanisms has been observed. The probability of producing a compound system is observed to be lower in the case of N=Z colliding systems as compared to the case of reactions induced on the more neutron rich 48Ca target. Predictions based on CoMD-II calculations show that the competition between fusion-like and dissipative reactions, for the selected centrality, can strongly constraint the parameterization of symmetry energy and its density dependence in the nuclear equation of state., Comment: 4 pages 3 figures submitted to phys.rew.Lett

Published
2008
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10. Influence of Chaos on the fusion enhancement by electron screening

Author

Kimura, S., Bonasera, A., and Cavallaro, S.

Subjects
Nuclear Theory
Abstract

We study the effect of screening by bound electrons in low energy nuclear reactions. We use molecular dynamics to simulate the reactions involving many electrons: D+$d$, D+D, $^3$He+$d$, $^3$He+D, $^6$Li+$d$, $^6$Li+D, $^7$Li+$p$, $^7$Li+H. Quantum effects corresponding to the Pauli and Heisenberg principles are enforced by constraints in terms of the phase space occupancy. In addition to the well known adiabatic and sudden limits, we propose a new "dissipative limit" which is expected to be important not only at high energies but in the extremely low energy region. The dissipative limit is associated with the chaotic behavior of the electronic motion. It affects also the magnitude of the enhancement factor. We discuss also numerical experiments using polarized targets. The derived enhancement factors in our simulation are in agreement with those extracted within the $R$-matrix approach., Comment: 6 pages, 6 figures, submitted to The European Physical Journal A (EPJ A direct), Springer-Verlag, in the Proceedings of Nuclear Physics in Astrophysics II, ATOMKI, Debrecen, Hungary, 16-20 May, 2005

Published
2005
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11. Correlation functions and emission time sequence of light charged particles from projectile-like fragment source in E/A = 44 and 77 MeV 40Ar + 27Al collisions

Author

Ghetti, R., Helgesson, J., Lanzano', G., De Filippo, E., Geraci, M., Aiello, S., Cavallaro, S., Pagano, A., Politi, G., Charvet, J. L., Dayras, R., Pollacco, E., Volant, C., Beck, C., Mahboub, D., and Nouicer, R.

Subjects
Nuclear Experiment
Abstract

Two-particle correlation functions, involving protons, deuterons, tritons, and alpha-particles, have been measured at very forward angles (0.7 deg < theta_lab < 7 deg), in order to study projectile-like fragment (PLF) emission in E/A = 44 and 77 MeV 40Ar + 27Al collisions. Peaks, originating from resonance decays, are larger at E/A = 44 than at 77 MeV. This reflects the larger relative importance of independently emitted light particles, as compared to two-particle decay from unstable fragments, at the higher beam energy. The time sequence of the light charged particles, emitted from the PLF, has been deduced from particle-velocity-gated correlation functions (discarding the contribution from resonance decays). Alpha-particles are found to have an average emission time shorter than protons but longer than tritons and deuterons., Comment: 18 pages, 5 figures, submitted to Nuclear Physics A

Published
2004
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12. Possibility to deduce the emission time sequence of neutrons and protons from the neutron-proton correlation function?

Author

Ghetti, R., Helgesson, J., Colonna, N., Jakobsson, B., Anzalone, A., Bellini, V., Carlen, L., Cavallaro, S., Celano, L., De Filippo, E., D'Erasmo, G., Di Santo, D., Fiore, E. M., Fokin, A., Geraci, M., Giustolisi, F., Kuznetsov, A., Lanzano', G., Mahboub, D., Marrone, S., Maartensson, J., Palomba, M., Pantaleo, A., Paticchio, V., Riera, G., Sperduto, M. L., Sutera, C., Tagliente, G., and Urrata, M.

Subjects
Nuclear Experiment
Abstract

Experimental information has been derived from the neutron-proton correlation function in order to deduce the time sequence of neutrons and protons emitted at 45 degrees in the E/A = 45 MeV 58Ni + 27Al reaction., Comment: 4 pages, 4 figures. Physical Review Letters, in press

Published
2001
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13. THE STRONG ROLE OF N/Z DEGREE OF FREEDOM IN Ca plus Ca REACTIONS AT 25 MeV/NUCLEON

Author

Lombardo, I, Agodi, C, Amorini, F, Anzalone, A, Auditore, L, Berceanu, I, Cardella, G, Cavallaro, S, DeFilippo, E, Giuliani, G, Geraci, E, Grassi, L, Han, J, LaGuidara, E, Lanzalone, G, Loria, D, Maiolino, C, Pagano, A, Papa, M, Pirrone, S, Politi, G, Porto, F, Rizzo, F, Russotto, P, Trifiro, A, Trimarchi, M, Verde, G, and Vigilante, M

Subjects
Mathematical Sciences, Physical Sciences, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Published
2011

14. Multiplicity-free representations of commutative C*-algebras and spectral properties

Author

Cavallaro, S.

Subjects
Mathematics - Operator Algebras
Abstract

Let A be a commutative unital C*-algebra and let S denote its Gelfand spectrum. We give some necessary and sufficient conditions for a nondegenerate representation of A to be unitarily equivalent to a multiplicative representation on a space L^2(S, m), where m is a positive measure on the Baire sets of S. We also compare these conditions with the multiplicity-free property of a representation., Comment: plain-tex

Published
1998

16. Radioactive ion beam opportunities at the new FRAISE facility of INFN-LNS

Author

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

Published
2022
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25. Isospin dependence of physical observables in Incomplete Fusion reactions at 25 MeV/nucleon

Author

Lombardo, I., Agodi, C., Alba, R., Amorini, F., Anzalone, A., Berceanu, I., Cardella, G., Cavallaro, S., Chatterjee, M.B., Coniglione, R., DeFilippo, E., DiPietro, A., Figuera, P., Geraci, E., Giuliani, G., Grassi, L., Grzeszczuk, A., LaGuidara, E., Lanzalone, G., LeNeindre, N., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., Sapienza, P., and Verde, G.

Published
2010
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28. miRNA and mRNA Profiling Links Connexin Deficiency to Deafness via Early Oxidative Damage in the Mouse Stria Vascularis

Author

Gentile, Giuseppe, Paciello, Fabiola, Zorzi, Veronica, Spampinato, A. G., Guarnaccia, M., Crispino, G., Tettey-Matey, A., Scavizzi, F., Raspa, M., Fetoni, Anna Rita, Cavallaro, S., Mammano, F., Gentile G., Paciello F. (ORCID:0000-0002-8473-8074), Zorzi V., Fetoni A. R. (ORCID:0000-0001-5405-4301), Gentile, Giuseppe, Paciello, Fabiola, Zorzi, Veronica, Spampinato, A. G., Guarnaccia, M., Crispino, G., Tettey-Matey, A., Scavizzi, F., Raspa, M., Fetoni, Anna Rita, Cavallaro, S., Mammano, F., Gentile G., Paciello F. (ORCID:0000-0002-8473-8074), Zorzi V., and Fetoni A. R. (ORCID:0000-0001-5405-4301)

Abstract

Pathogenic mutations in the non-syndromic hearing loss and deafness 1 (DFNB1) locus are the primary cause of monogenic inheritance for prelingual hearing loss. To unravel molecular pathways involved in etiopathology and look for early degeneration biomarkers, we used a system biology approach to analyze Cx30−/− mice at an early cochlear post-natal developmental stage. These mice are a DFNB1 mouse model with severely reduced expression levels of two connexins in the inner ear, Cx30, and Cx26. Integrated analysis of miRNA and mRNA expression profiles in the cochleae of Cx30−/− mice at post-natal day 5 revealed the overexpression of five miRNAs (miR-34c, miR-29b, miR-29c, miR-141, and miR-181a) linked to apoptosis, oxidative stress, and cochlear degeneration, which have Sirt1 as a common target of transcriptional and/or post-transcriptional regulation. In young adult Cx30−/− mice (3 months of age), these alterations culminated with blood barrier disruption in the Stria vascularis (SV), which is known to have the highest aerobic metabolic rate of all cochlear structures and whose microvascular alterations contribute to age-related degeneration and progressive decline of auditory function. Our experimental validation of selected targets links hearing acquisition failure in Cx30−/− mice, early oxidative stress, and metabolic dysregulation to the activation of the Sirt1–p53 axis. This is the first integrated analysis of miRNA and mRNA in the cochlea of the Cx30−/− mouse model, providing evidence that connexin downregulation determines a miRNA-mediated response which leads to chronic exhaustion of cochlear antioxidant defense mechanisms and consequent SV dysfunction. Our analyses support the notion that connexin dysfunction intervenes early on during development, causing vascular damage later on in life. This study identifies also early miRNA-mediated biomarkers of hearing impairment, either inherited or age related.

Published
2021

29. Isospin aspects in nuclear reactions involving Ca beams at 25 MeV/nucleon

Author

Lombardo, I., Agodi, C., Alba, R., Amorini, F., Anzalone, A., Auditore, L., Berceanu, I., Cardella, G., Cavallaro, S., Chatterjee, M. B., De Filippo, E., Di Pietro, A., Figuera, P., Giuliani, G., Geraci, E., Grassi, L., Grzeszczuk, A., Han, J., La Guidara, E., Lanzalone, G., Le Neindre, N., Loria, D., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Pop, A., Porto, F., Rizzo, F., Russotto, P., Santonocito, D., Trifirò, A., Trimarchi, M., Verde, G., and Vigilante, M.

Published
2011
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31. Multifragmentation threshold in 93Nb + natMg collisions at 30 MeV/nucleon

Author

Manduci, L., Lopez, O., Steckmeyer, J.C., Borderie, B., Bougault, R., Dayras, R., Frankland, J.D., Guinet, D., Lautesse, P., Le Neindre, N., Pârlog, M., Rivet, M.F., Rosato, E., Roy, R., Vient, E., Vigilante, M., Tamain, B., Wieleckzo, J.P., Aiello, S., Anzalone, A., Cardella, G., Cavallaro, S., De Filippo, E., Feminó, S., Giustolisi, F., Guazzoni, P., Lanzalone, G., Lanzanó, G., Nigro, S. Lo, Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Sperduto, L., and Zetta, L.

Published
2008
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35. Digital signal processing for mass identification in a 4[pi]--detector, using time of flight measurement

Author

Amorini, F., Anzalone, A., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., De Filippo, E., Guazzoni, P., La Guidara, E., Lanzano, G., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Riccio, F., Rizzo, F., Russo, S., Russotto, P., and Zetta, L.

Subjects
Algorithms -- Methods, Signal processing -- Methods, Radiation warning systems -- Properties, Radiation -- Measurement, Radiation -- Methods, Algorithm, Digital signal processor, Business, Electronics, Electronics and electrical industries
Abstract

CHIMERA is the only 4[pi]-multidetector, used in intermediate nuclear physics experiments, able to perform mass identification of the reaction products. To this purpose, it employs time of flight measurements done with traditional time to digital converters. In order to improve the resolution in mass identification, we have applied digital signal processing to time of flight measurements. This paper presents the methodology for data analysis, the adopted algorithms and the results obtained at different sampling frequencies (mass identification up to A = 33 for the reaction products produced by a 20.5 MeV/u [sup.20]Ne beam on [sup.27]Al target). Index Terms--Mass identification, nuclear measurements, nuclear physics, online digital signal processing, time of flight measurement.

Published
2008

36. On-board digital signal processing for 4 [pi]-detector large-area telescopes

Author

Amorini, F., Anzalone, A., Cardella, G., Cavallaro, S., De Filippo, E., Guazzoni, P., La Guidara, E., Lanzano, G., Pagano, A., Pirrone, S., Politi, G., Porto, F., Riccio, F., Rizzo, F., Russo, S., Russotto, P., and Zetta, L.

Subjects
Digital signal processors -- Research, Nuclear physics -- Research, Telescope -- Research, Digital signal processor, Business, Electronics, Electronics and electrical industries
Abstract

The digital pulse shape data acquisition (DAQ) system used by the large area telescopes of the 4[pi]-multidetector CHIMERA requires transferring large amount of data to the computer. This is necessary so that the same information can be extracted from the detector pulses as in previous analog based systems. To overcome this problem, we have used a sampling ADC-board equipped with two TigerSHARC digital signal processors. The board receives the data and reconstructs the event parameters online. The data volume is significantly reduced by transmitting to the DAQ only the reconstructed event parameters. Index Terms--Digital signal processors, mass and charge identification, nuclear measurements, nuclear physics, online and on-board digital signal processing.

Published
2007

38. Charge identification in large area planar silicon detectors, using digital pulse shape acquisition

Author

Alderighi, M., Amorini, F., Anzalone, A., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., DeFilippo, E., Guazzoni, P., LaGuidara, E., Lanzano, G., Lanzalone, G., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russo, S., Sacca, G., Sassi, M., Sechi, G., and Zetta, L.

Subjects
Silicon diodes -- Mechanical properties, Silicon diodes -- Observations, Electric charge and distribution -- Observations, Business, Electronics, Electronics and electrical industries
Abstract

The capability of digital pulse shape technique to acquire data from CHIMERA detection cells (Si-CsI(TI) telescopes) has been evidenced in our previous works. We have now applied this technique to the charge discrimination of the products stopped in the silicon detectors. Large area totally depleted CHIMERA planar silicon detectors (5 cm x 5 cm area, 300/[micro]m thick) in both rear and front side injection have been used. In preliminary tests full charge identification for the reaction products up to Z = 11 have been obtained for products both crossing ([DELTA]E-E technique) and stopping in the silicon detector, using a 21 MeV/u [sup.20]Ne beam at the LNS Superconducting Cyclotron in Catania. The quality of the obtained results clearly indicates that the digital signal processing approach is able to give excellent results in this application, too. Index Terms--Charged particle identification, digital pulse shape processing, multidetector arrays technique, pulse shape analysis.

Published
2006

39. PRESTO: a computational and storage unit for CHIMERA DAQ

Author

Alderighi, M., Amorini, F., Anzalone, A., Cardella, G., Cavallaro, S., DeFilippo, E., Ghilardi, D., Guazzoni, P., LaGuidara, E., Lanzano, G., Lanzalone, G., Maiolino, C., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Russo, S., Russotto, P., Santonocito, D., Sassi, M., Sechi, G.R., and Zetta, L.

Subjects
Information storage and retrieval -- Research, Computers -- Services, Computers -- Management, Data acquisition software, Company business management, Business, Electronics, Electronics and electrical industries
Abstract

We have designed, built, and tested an on-line pre-analysis and data-storage unit for the data acquisition system of the 47r-detector CHIMERA. The unit uses special algorithms to perform particle identification and automatic peak detection. It tags in charge each event and stores the results on external unit, together with the raw data. It consists of two commercial 2 GHz workstations connected together through 1 Gb/s Ethernet boards and to the data acquisition system through a 100 Mb/s Ethernet. Index Terms--Data storage unit, multidetector online monitoring, online computational system.

Published
2005

40. Particle identification via pulse shape analysis for large-area silicon detectors of the CHIMERA array

Author

Alderighi, M., Amorini, F., Anzalone, A., Arena, N., Auditore, L., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., Chatterjee, M.B., D'Andrea, M., De Filippo, E., Fichera, F., Geraci, E., Giustolisi, F., Guardone, N., Grimaldi, A., Guazzoni, P., La Guidara, E., Lanzano, G., Lanzalone, G., Maiolino, C., Nicotra, D., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Pullia, A., Rizzo, F., Russo, S., Russotto, P., Santonocito, D., Sacca, G., Sassi, M., Schroder, W. Udo, Sechi, G.R., Trifiro, A., Toke, J., Trimarchi, M., Urso, S., and Zetta, L.

Subjects
Silicon diodes -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

Mass and atomic-number identification (ID) of reaction products is a fundamental requirement of any nuclear reaction study. An effective particle-ID method is demonstrated, based on pulse shape analysis/discrimination (PSD) applied to large-area, single-element silicon detectors. This technique uses commercial electronic modules and achieves atomic number resolution rivaling that typically obtained with multi-element ([DELTA]E-E) detector telescopes. The method is applied to the CHIMERA detector system without compromising its time-of-flight (TOF) resolution. In-beam tests of the PSD method have been performed with large-area, 300-[micro]m thick CHIMERA silicon detectors, measuring particles from the [sup.19]F + [sup.12]C reaction at Tandem energies. Performance of a simple PSD set up is discussed, for front and rear particle injection. Index Terms--Charge identification, planar silicon detector, pulse shape.

Published
2005

41. CHIMERA data acquisition via digital sampling technique

Author

Alderighi, M., Anzalone, A., Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., De Filippo, E., Geraci, E., Giustolisi, F., Guazzoni, P., Laguidara, E., Lanzano, G., Lanzalone, G., Pagano, A., Papa, M., Pirrone, S., Politi, G., Porto, F., Russo, S., Sassi, M., Sechi, G.R., and Zetta, L.

Subjects
Sampling (Acoustical engineering) -- Methods, Detectors -- Analysis, Data entry, Business, Electronics, Electronics and electrical industries
Abstract

A 100 Msamples/s 14-bit sampling analog-to-digital converter has been used to perform digital pulse-shape acquisition of signals collected from CHIMERA telescopes. Two different kinds of tests have been carried out to check the performances. The signals from a typical CHIMERA detection cell have been collected using both a standard CHIMERA electronic chain up to the amplifier, and a very simple analog front end, basically reduced to the preamplifier. The obtained on-beam and on-line results are presented. Index Terms--Digital pulse shape acquisition, digital signal processing, multidetector arrays, particle identification, simple analog front end.

Published
2004

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