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A new facility for the developement of new X-ray detectors: The X-ray Calibration Facility
Get PDFThe X-ray Calibration Facility (XCF) is an irradiation setup located at the Physics Department of the University of Turin, Italy, and conceived to characterize, test and design X-ray detectors. It can provide beams of photons with different energy and polarization configuration, that make it suitable for calibration and test of energy, position and polarization sensitive detectors
In-medium effects in ϕ-meson production in heavy ion collisions from subthreshold to relativistic energies
Get PDFWe investigate the hidden strange φ meson production in heavy-ion collisions from subthreshold (Ekin ∼ 1AGeV) to relativistic (Ekin ∼ 21ATeV) energies as well as its coupling to the open strange mesons (kaons, antikaons) and
their productions. Our study is based on the off-shell microscopic Parton-Hadron-String Dynamics (PHSD) transport approach. Implementing novel meson-baryon and meson-hyperon production channels for φ mesons, calculated within a T-matrix coupled channel approach based on the extended SU(6) chiral effective Lagrangian model, along with the collisional broadening of the φ-meson in-medium spectral
function, we find a substantial enhancement of φ meson production in heavy-ion collisions, especially at sub- and near-thresholds. This allows to describe the experimentally observed strong enhancement of the φ/K− ratio at low energies without including hypothetical decays of heavy baryonic resonances to φ as in alternative approaches
Investigating collective effects in small collision systems using PYTHIA8 and EPOS4 simulations
Get PDFMeasurements of azimuthal angular correlations of inclusive and identified particles from EPOS4 and PYTHIA8 event generators are used to study the unexpected collective behavior observed in small collision systems. In particular, anisotropic flow coefficients measured using two- and four-particle correlations and balance functions are reported in pp collisions at √s = 13.6 TeV. The second order Fourier coefficient of π±,K±,p+p, Λ+Λ, K0 S,andΞ−+Ξ+ obtained using the scalar product method exhibits a mass ordering at low transverse momentum when a pseudo-rapidity gap of ∣Δη∣>2 is used, being more pronounced for EPOS4. The second harmonic two-particle cumulants of inclusive charged particles decrease with charged-particle multiplicity and depend weakly on ∣Δη∣, while the second harmonic four-particle cumulants are consistent with zero. The balance functions show different responses, being influenced by the different charge production mechanisms
Strumenti legali per l’incentivazione della stabilità aziendale e degli investimenti a lungo termine: un’analisi comparata del voto maggiorato in Francia
Get PDFIl policy brief esamina il voto maggiorato, introdotto in Francia nel 2014 con la Legge Florange e successivamente in Italia, come strumento per incentivare la stabilità aziendale e promuovere investimenti a lungo termine. In Francia, il voto maggiorato è stato reso automatico, a meno che le imprese decidessero di rinunciarvi. Tuttavia, le analisi sulle cento principali aziende francesi hanno mostrato che questa legge non ha avuto un impatto significativo sulle loro performance economiche, come redditività o valore di mercato. In Italia, il voto maggiorato è stato introdotto nel 2014 e rafforzato nel 2024, con l’obiettivo di facilitare la quotazione delle imprese italiane
in borsa senza perdere il controllo gestionale. A differenza della Francia, in Italia il
voto maggiorato è applicato solo se deciso dall’assemblea degli azionisti. L’esperienza francese suggerisce che, da solo, il voto maggiorato non garantisce effetti positivi. Per renderlo più efficace in Italia, si raccomanda di affiancarlo a incentivi per gli investitori, monitorare attentamente i risultati della normativa e introdurre misure che migliorino la governance aziendale e attraggano nuovi capitali, creando un ambiente favorevole alla crescita sostenibile delle imprese
Role of dissipation on the quasielastic barrier distributions: The case of 20Ne+92,94,95Mo systems
Get PDFThe quasielastic barrier distributions of the 20Ne+92,94,95Mo systems were measured at the Heavy Ion Laboratory (HIL) of the University of Warsaw. The preliminary results provide evidence of the influence of dissipation due to single-particle excitations on the structure of the barrier distribution. The increasing
number of single-particle excitations for the heaviest Mo isotopes smoothes out the barrier distribution, which loses the structure predicted by the coupling to only collective excitations. Theoretical calculations which include the coupling to the non-collective excitation agree with the experimental data. The measurement of the differential transfer cross-sections of the three systems should clarify the role that the dissipation due to transfer might play on the smearing of the barrier distribution
Experimental search for high-spin resonant states in collisions of 28Si+12C at 35 MeV/nucleon, using FAUST array
Get PDFA search for high-spin resonant states in highly excited 28Si is performed, using an inverse reaction of 28Si+12C at 35MeV/nucleon. Twelve possible candidate peaks in different seven-α decay channels, particularly those involving 8Be(gs and 2+) emission are suggested as such resonances in the sub μb range of cross-section. Utilizing a shape analysis method, a χ2 fit is performed comparing the experimental events in each resonant peak to those of simulated events with particular shapes and angular momenta. The shapes and angular momenta of the simulated event set at the χ2 minimum are taken as those of the candidate peaks. For nine of the candidate peaks their optimum shapes and angular momenta are
suggested. The trend of the evaluated excitation energy vs. angular momentum agrees well with that of the theoretical toroidal high-spin states predicted by Ren et al., Nucl. Phys. A, 996 (2020) 121696, but the minimum χ2 fits to the experimental data suggest tube shapes not toroids as the optimal disassembling shapes
Clustering states investigation with FARCOS detectors
Get PDFThe FARCOS array is a compact and innovative detection system, built for studies of spectroscopy, femtoscopy and correlations, offering high energy and angular resolution. At INFN-LNS, an experiment was performed to study the
cluster structure of light radioactive nuclei, such as 10Be, 13Band16C, using the CHIMERA and FARCOS multi-detector. The four FARCOS detectors were placed at small angle for an in depth study of the correlation of break-up fragments resulting from the decay of excited cluster states. An overview of the analysis still in progress will be given, showing, in particular, some results for the analysis of 10Be clustering
Status and physics perspectives of FAIR
Get PDFThe Facility for Antiproton and Ion Research (FAIR) in Darmstadt, which is being built close to the GSI Helmholtzzentrum fur Schwerionenforschung in Darmstadt, makes significant progress in its mission to provide unique opportunities for a rich and multidisciplinary research program. The mission of FAIR comprises the investigation of QCD-matter and QCD-phase diagram at high baryon densities;
nuclear structure and nuclear astrophysics investigations with nuclei far off stability; QCD studies with cooled, high-intensity antiproton beams; precision studies on fundamental interactions and symmetries; high-density plasma physics; atomic and material science studies; radio-biological investigations and other application oriented research
R&D activities of FAZIA upgrade in Korea
Get PDFThe FAZIA detector is designed to identify charges and masses of fragments from heavy-ion collisions within an energy range of several tens to a hundred MeV per nucleon. two layers are Si sensors with different thicknesses of 300μm and 500μm, respectively, while the third layer is a 10cm CsI(Tl) scintillator coupled with a photodiode detector read out. The detector signals are analyzed using digital signal processing based on the FPGAs. The current module enabled the charge identification of nuclei with Z up to 54 and the isotopic nuclei discrimination with Z up to 25 by using the ΔE-E information and the pulse shape analysis. The FAZIA upgrade project aims to extend the beam energy coverage and increase the acceptance capabilities. The Korea FAZIA team is going to develop thicker and thinner Si sensors and make the compact and versatile FEE card to meet upgrade goals. This paper describes the R&D process for the Si sensors and FEE card
Study of light cluster population in dilute nuclear matter from heavy ion vaporization events
Get PDFAn analysis work on vaporization events selected from 36Ar+58Ni collisions at 74 MeV/nucleons has been done. In the particle velocity spectrum, we evaluated the pollution from other sources of emission than the quasi-projectile.
In particular, the HIPSE event generator has been used to estimate the shape of the polluting distribution. Moreover, the contribution of secondary decays in measured multiplicities has been evaluated using two-body correlations, where the non-resonant background was evaluated with an event mixing technique