A5100639277- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Diamond and Carbon-based Materials Research
- Nuclear Physics and Applications
- Black Holes and Theoretical Physics
- Nuclear reactor physics and engineering
- Medical Imaging Techniques and Applications
- Ion-surface interactions and analysis
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- CCD and CMOS Imaging Sensors
- Radiation Effects in Electronics
- Astronomical and nuclear sciences
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
2016-2025
University of Catania
2016-2025
University of Antwerp
2024
A. Alikhanyan National Laboratory
2014-2024
Institute of High Energy Physics
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2023-2024
Pontifical Catholic University of Rio de Janeiro
2022-2024
Université Libre de Bruxelles
2022-2024
Universidade Estadual de Londrina
2022-2024
University of Milan
2024
Using reverse kinematics, we have studied the breakup of $1.0A$ GeV gold nuclei incident on a carbon target. The detector system permitted exclusive event reconstruction nearly all charged reaction products. moments resulting fragment distribution provide strong evidence that nuclear matter possesses critical point observable in finite nuclei. We determined values for exponents $\ensuremath{\gamma}$, $\ensuremath{\beta}$, and $\ensuremath{\tau}$. These are close to those liquid-gas systems...
An exclusive study of the interaction 1A GeV Au with C shows a separability into two stages: prompt stage involving emission most $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ and some $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ particles second decay an equilibrated remnant, which typically undergoes multifragmentation. The mean mass, charge, excitation energy, initial temperature ${T}_{i}$ remnant have been determined as function total charge multiplicity, $m$, has...
Exclusive measurements have been made of Au $+$Au reactions with beam energies ranging from 0.25 $A$ to 1.15 GeV. We present directed collective flow averaged over all light fragments masses up alphas, as well separate for protons, deuterons, tritons, ${}^{3}$He, ${}^{4}$He, and Li. The results show a strong increase the fragment mass at measured. Experimental are compared quantum molecular dynamics model. find that neither ``soft'' nor ``hard'' equation state can describe data entire range energies.
Multifragmentation MF results from 1AGeV Au on C have been compared with the Copenhagen statistical multifragmentation model (SMM). The complete charge, mass, and momentum reconstruction of projectile was used to identify high ejectiles leaving an excited remnant mass A, charge Z, excitation energy E* which subsequently multifragments. Measurement magnitude multiplicity (energy) dependence initial free volume breakup determines variable parametrization SMM. Very good agreement is obtained...
A systematic study of energy spectra for light particles emitted at midrapidity from Au+Au collisions E= (0.25–1.15) GeV reveals a significant nonthermal component consistent with collective radial flow. This is evaluated as function bombarding and event centrality. Comparisons to quantum molecular dynamics Boltzmann-Uehling-Uhlenbeck models are made different equations state.Received 15 August 1994DOI:https://doi.org/10.1103/PhysRevLett.75.2662©1995 American Physical Society
A high-statistics exclusive study of the multifragmentation 1A GeV gold on carbon has been performed. Particles with Z<~2 show evidence emission in a first prompt stage as well second equilibrium whereas fragments Z>~3 appear to be emitted essentially only stage. Two methods for separation particles into two stages are given and they agreement. The yields each determined function event charged particle multiplicity m. mass, nuclear charge, excitation energy per nucleon, temperature remnant...
E896 has measured Lambda production in 11.6A GeV/c Au-Au collisions over virtually the whole rapidity phase space. The midrapidity p(t) distributions have been for first time at this energy and appear to indicate that hyperons different freeze-out conditions than protons. A comparison with relativistic quantum molecular dynamics model shows while there is good shape agreement high predicts significantly slopes of m(t) spectra midrapidity. data, where overlap occurs, are consistent previously...
The fragment yields from the multifragmentation of gold, lanthanum, and krypton nuclei obtained by EOS Collaboration are examined in terms Fisher’s droplet formalism modified to account for Coulomb energy. critical exponents σ τ surface energy coefficient c0 obtained. Estimates made pressure-temperature temperature-density coexistence curve finite neutral nuclear matter as well location point.Received 7 May 2002DOI:https://doi.org/10.1103/PhysRevC.67.024609©2003 American Physical Society
This paper reports the elemental production cross sections for 17 projectile-energy combinations with energies between 338 and 894 MeV/nucleon interacting in a liquid hydrogen target. These results were obtained from two runs at LBL Bevalac using projectiles ranging $^{22}\mathrm{Ne}$ to $^{58}\mathrm{Ni}$. Cross measured all fragment elements charges greater than or equal half charge of projectile. The show that, over energy ion range investigated, general decrease section decreasing is...
A liquid hydrogen target was used to study the nuclear fragmentation of beams relativistic heavy ions, 22Ne 58Ni, over an energy range 400 900 MeV/nucleon. The experiments were carried out at Lawrence Berkeley Laboratory Bevalac HISS facility, using charge-velocity-rigidity method identify charged fragments. Here we describe general concept experiment and present total charge-changing cross sections obtained from 17 separate runs. These new measured display dependence which follows...
Abstract The ePIC experiment at the future Electron-Ion Collider (EIC) aims to use silicon photomultipliers (SiPMs) as photodetector technology for dual-radiator ring-imaging Cherenkov detector (dRICH). Despite their advantages this low light application and insensitivity high magnetic fields, SiPMs are sensitive radiation require rigorous testing ensure that single-photon counting capabilities dark count rate kept under control over years of operation. presented results show successful a...
The cluster distributions of different systems are examined to search for signatures a continuous phase transition. In system known possess such transition, both sensitive and insensitive present; while in not only present. It is shown that nuclear multifragmentation results belonging the former category, suggesting fragments result
Multifragmentation in fully reconstructed events from 1A GeV Kr and La collisions with C has been studied. Results are compared similar data for Au+C. The emitted charged particles fragments identified emission either a prompt first stage or second which the remnant resulting breaks up. nuclear charge, mass, excitation energy distributions of determined. total multiplicity, as well those stages obtained. Freeze-out temperatures thermal permit determination caloric curve. fragment charge...
Using charged-particle-exclusive measurements of Au+Au collisions in the LBL Bevalac's EOS time projection chamber, we investigate momentum-space densities fragments up to 4He as a function fragment transverse momentum, azimuth relative reaction plane, rapidity, multiplicity, and beam energy. Most features these above momentum threshold are consistent with coalescence, and, particular, increase sideward flow mass is generally well described by power law.Received 29 August...
Invariant mass analyses of (p,π±) pairs in 58Ni+Cu collisions at 1.97AGeV have been performed and show correlations resulting from the decays Δ resonance, Λ baryon, possibly N*(1440) resonance. A reduction is observed increases with collision centrality. Events generated by relativistic cascade model (ARC) also reveal a reduction. The related to size reaction volume details production mechanisms heavy ion collisions.Received 9 September...
The interactions of ${}^{36}\mathrm{Ar}$ projectile nuclei with energies 361, 546, and 765 MeV/nucleon ${}^{40}\mathrm{Ar}$ 352 MeV/nucleon, have been studied in a liquid-hydrogen target as part program to study relevance the problem cosmic-ray propagation interstellar medium. We measured cross sections for production isotopic fragments these interactions. variations mass, charge, energy, are examined insights into any systematic features this type fragmentation reaction that might aid...
A systematic analysis of multifragmentation (MF) in fully reconstructed events from $1A\mathrm{GeV}$ Au, La, and Kr collisions with C has been performed. These data are used to provide a definitive test the variable volume version statistical model (SMM). single set SMM parameters directly determined by semi-empirical mass formula after adjustable inverse level density parameter ${\ensuremath{\epsilon}}_{0}$ is fragment distributions. The results for second stage multiplicity, size biggest...
It is shown that the Fisher droplet model, percolation, and nuclear multifragmentation share common features of reducibility (stochasticity in multiplicity distributions) thermal scaling (one-fragment production probabilities are Boltzmann factors). Barriers obtained, for cluster on percolation lattices, from factors show a power-law dependence size with an exponent 0.42+/-0.02. The EOS Collaboration Au data yield barriers 0.68+/-0.03. Values surface energy coefficient low density system...
Transverse flow has been studied as a function of impact parameter for pions and protons from the reaction 1.15AGeV 197Au+197Au. We observe an “antiflow” behavior both π+ π− in peripheral collisions.Received 29 July 1996DOI:https://doi.org/10.1103/PhysRevLett.78.4165©1997 American Physical Society
Using charged-particle-exclusive measurements of $\mathrm{Au}+\mathrm{Au}$ collisions in the Bevalac's EOS time projection chamber, we demonstrate advantages an alternative representation squeeze-out phenomenon where speed collective expansion is slowest plane reaction, and modulated sinusoidally according to fragment azimuth relative this plane. This simpler facilitates a highly comprehensive description light spectra three main categories motion: sideward flow, squeeze-out, radial expansion.