A. D’Angelo
A5060094294- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Scientific Research and Discoveries
- Advanced NMR Techniques and Applications
- Nuclear Materials and Properties
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
- Advanced X-ray Imaging Techniques
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2016-2025
University of Rome Tor Vergata
2016-2025
Cornell University
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2013-2023
Sapienza University of Rome
2013-2023
Istituto Nazionale di Fisica Nucleare
1986-2023
University of York
2021
Tel Aviv University
2019
Argonne National Laboratory
2015-2018
Thomas Jefferson National Accelerator Facility
2013-2017
The results obtained with the total exposure of 1.04 ton x yr collected by DAMA/LIBRA-phase1 deep underground at Gran Sasso National Laboratory (LNGS) I.N.F.N. during 7 annual cycles (i.e. adding a further 0.17 exposure) are presented. data give evidence for presence Dark Matter (DM) particles in galactic halo, on basis exploited model independent DM modulation signature using highly radio-pure NaI(Tl) target, 7.5 sigma C.L.. Including also first generation DAMA/NaI experiment (cumulative...
The atomic nucleus is composed of two different kinds fermions, protons and neutrons. If the neutrons did not interact, Pauli exclusion principle would force majority fermions (usually neutrons) to have a higher average momentum. Our high-energy electron scattering measurements using 12C, 27Al, 56Fe 208Pb targets show that, even in heavy neutron-rich nuclei, short-range interactions between form correlated high-momentum neutron-proton pairs. Thus, greater probability than momentum Fermi This...
We present results on the electroexcitation of low mass resonances Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 in a wide range Q2. The were obtained comprehensive analysis JLab-CLAS data differential cross sections, longitudinally polarized beam asymmetries, longitudinal target beam-target asymmetries for pion electroproduction off proton. analysed using two conceptually different approaches, fixed-t dispersion relations unitary isobar model, allowing us to draw conclusions model...
We present measurements of the differential cross section and $\ensuremath{\Lambda}$ recoil polarization for $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{+}\ensuremath{\Lambda}$ reaction made using CLAS detector at Jefferson Lab. These cover center-of-mass energy range from $1.62$ to $2.84$ GeV a wide ${K}^{+}$ production angles. Independent analyses were performed ${K}^{+}p{\ensuremath{\pi}}^{\ensuremath{-}}$ ${K}^{+}p$ (missing ${\ensuremath{\pi}}^{\ensuremath{-}}$) final-state...
Experimental observations and theoretical arguments at Galaxy larger scales have suggested that a large fraction of the Universe is composed by Dark Matter particles. This has motivated DAMA experimental efforts to investigate presence such particles in galactic halo exploiting model independent signature very highly radiopure set-ups deep underground. Few introductory are summarized before presenting review present positive results obtained DAMA/NaI DAMA/LIBRA Gran Sasso National Laboratory...
The reaction gamma + p -> K+ Sigma pi was used to determine the invariant mass distributions or "line shapes" of Sigma+ pi-, Sigma- pi+ and Sigma0 pi0 final states, from threshold at 1328 MeV/c^2 through range Lambda(1405) Lambda(1520). measurements were made with CLAS system Jefferson Lab using tagged real photons, for center-of-mass energies 1.95 < W 2.85 GeV. three differ strongly in vicinity I=0 \Lambda(1405), indicating presence substantial I=1 strength reaction. Background...
The transition helicity amplitudes from the proton ground state to $P_{11}(1440)$ and $D_{13}(1520)$ excited states ($\gamma_{v}pN^*$ electrocouplings) were determined analysis of nine independent one-fold differential $\pi^{+} \pi^{-} p$ electroproduction cross sections off a target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$^{2}$} $<$ $Q^{2}$ 0.60 \enskip GeV$^{2}$}. phenomenological reaction model was employed for separation resonant non-resonant contributions final...
New dedicated high quantum efficiency (Q.E.) photomultipliers (PMTs) have been produced by HAMAMATSU company, tested, selected and installed in the DAMA/LIBRA set-up at Gran Sasso National Laboratory (LNGS) of I.N.F.N.. In this paper results obtained measurements various features these Q.E. PMTs are reported, some performances new configuration shown.
We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, lead targets at Q2 > 1.5 (GeV/c)2, xB 1.1 missing momentum 400 MeV/c. This was first direct measurement of both proton-proton (pp) neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all nuclei, average to reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for Single-Charge Exchange effects decreased...
Unpolarized and beam-polarized fourfold cross sections (d^{4}σ/dQ^{2}dx_{B}dtdϕ) for the ep→e^{'}p^{'}γ reaction were measured using CLAS detector 5.75-GeV polarized electron beam of Jefferson Lab accelerator, 110 (Q^{2},x_{B},t) bins over widest phase space ever explored in valence-quark region. Several models generalized parton distributions (GPDs) describe data well at most our kinematics. This increases confidence that we understand GPD H, expected to be dominant contributor these...
There is a significant discrepancy between the values of proton electric form factor, G(E)(p), extracted using unpolarized and polarized electron scattering. Calculations predict that small two-photon exchange (TPE) contributions can significantly affect extraction G(E)(p) from electron-proton cross sections. We determined TPE contribution by measuring ratio positron-proton to elastic scattering sections simultaneous, tertiary electron-positron beam incident on liquid hydrogen target...
In this paper a new search for non-Paulian nuclear processes, i.e. processes normally forbidden by the Pauli Exclusion Principle (PEP), is presented. It has been carried out at Gran Sasso National Laboratory of INFN means highly radiopure DAMA/LIBRA set-up (sensitive mass about 250 kg NaI(Tl)). particular, improved upper limit spontaneous emission rate protons with energy E p ≥ 10 MeV in 23Na and 127I obtained: 1.63 × 10−33 s−1 (90% C.L.). The corresponding on relative strength (δ 2)...
High-statistics differential cross sections for the reactions $\ensuremath{\gamma}p\ensuremath{\rightarrow}p\ensuremath{\eta}$ and $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\eta}}^{'}$ have been measured using CEBAF large acceptance spectrometer (CLAS) at Jefferson Lab center-of-mass energies from near threshold up to 2.84 GeV. The ${\ensuremath{\eta}}^{'}$ results are most precise date provide largest energy angular coverage. $\ensuremath{\eta}$ measurements extend range of...
We report the first measurement of transverse momentum dependence double-spin asymmetries in semi-inclusive production pions deep-inelastic scattering off longitudinally polarized proton. Data have been obtained using a electron beam 5.7 GeV with CLAS detector at Jefferson Lab (JLab). Modulations single spin over azimuthal angle between lepton and hadron planes ϕ measured wide kinematic range Bjorken x virtual photon squared four-momentum Q2. A significant nonzero sin2ϕ asymmetry was...
We report the exclusive photoproduction cross sections for Sigma(1385), Lambda(1405), and Lambda(1520) in reactions gamma + p -> K+ Y* using CLAS detector energies from near respective production thresholds up to a center-of-mass energy W of 2.85 GeV. The differential are integrated give total each hyperon. Comparisons made current theoretical models based on effective Lagrangian approach fitted previous data. accuracy these is seen vary widely. Lambda(1405) region strikingly different...
Much less is known about neutron structure than that of the proton due to absence free targets. Neutron information usually extracted from data on nuclear targets such as deuterium, requiring corrections for binding and nucleon off-shell effects. These are model dependent have significant uncertainties, especially large values Bjorken scaling variable x. The Barely Off-shell Nucleon Structure (BONuS) experiment at Jefferson Lab measured inelastic electron deuteron scattering cross section,...