A5020251842- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Photocathodes and Microchannel Plates
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Electron and X-Ray Spectroscopy Techniques
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Computational Physics and Python Applications
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Radiation Therapy and Dosimetry
- Superconductivity in MgB2 and Alloys
Istituto Nazionale di Fisica Nucleare
2004-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2015-2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2007-2024
University of Ferrara
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
1995-2024
Friedrich-Alexander-Universität Erlangen-Nürnberg
2022-2024
Forschungszentrum Jülich
2012-2024
Pennsylvania State University
2023
University of California, Riverside
2023
European Organization for Nuclear Research
2023
Precise measurements of the spin structure functions proton ${g}_{1}^{p}(x,{Q}^{2})$ and deuteron ${g}_{1}^{d}(x,{Q}^{2})$ are presented over kinematic range $0.0041\ensuremath{\le}x\ensuremath{\le}0.9$ $0.18\text{ }\text{ }{\mathrm{GeV}}^{2}\ensuremath{\le}{Q}^{2}\ensuremath{\le}20\text{ }{\mathrm{GeV}}^{2}$. The data were collected at HERMES experiment DESY, in deep-inelastic scattering 27.6 GeV longitudinally polarized positrons off hydrogen deuterium gas targets internal to HERA storage...
The CUORE experiment, a ton-scale cryogenic bolometer array, recently began operation at the Laboratori Nazionali del Gran Sasso in Italy. array represents significant advancement this technology, and work we apply it for first time to high-sensitivity search lepton-number--violating process: $^{130}$Te neutrinoless double-beta decay. Examining total TeO$_2$ exposure of 86.3 kg$\cdot$yr, characterized by an effective energy resolution (7.7 $\pm$ 0.5) keV FWHM background region interest...
The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, direct measure contribution hard two-photon exchange section. In measurement, 2.01 GeV electron and positron beams were directed through hydrogen gas target internal DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers time-of-flight scintillators detected elastically scattered leptons in coincidence recoiling...
The momentum and helicity density distributions of the strange quark sea in nucleon are obtained leading order from charged-kaon production deep-inelastic scattering on deuteron. extracted spin-averaged K+/- multiplicities, inclusive double-spin asymmetries for polarized positrons by a deuterium target. shape distribution is softer than that average ubar dbar quarks. In region measurement 0.02 < x 0.6 Q^2 > 1.0 GeV^2, zero within experimental uncertainties.
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
Double-spin asymmetries of semiinclusive cross sections for the production identified pions and kaons have been measured in deep inelastic scattering polarized positrons on a deuterium target. Five helicity distributions including those three sea quark flavors were extracted from these data together with reanalyzed previous hydrogen These are consistent zero all flavors. A recently predicted flavor asymmetry polarization light appears to be disfavored by data.
Single-spin asymmetries have been measured for semi-inclusive electroproduction of $\pi^+$, $\pi^-$, $\pi^0$ and $K^+$ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The appear the distribution hadrons azimuthal angle $\phi$ around virtual photon direction, relative to lepton plane. corresponding analysing powers $\sin \phi$ moment cross section are $0.012 \pm 0.002 {(stat.)} {(syst.)}$ $0.006 0.003 $0.021 0.005 $0.013 0.006 $K^+$. 2\phi$ moments...
The first observation of an azimuthal cross section asymmetry with respect to the charge incoming lepton beam is reported from a study hard exclusive electroproduction real photons. data have been accumulated by HERMES experiment at DESY, in which HERA 27.6 GeV electron or positron scattered off unpolarized hydrogen gas target. observed attributed interference between Bethe-Heitler process and deeply virtual Compton scattering (DVCS) process. term sensitive DVCS amplitudes, provide most...
A bstract comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction pions, charged kaons, protons, antiprotons from transversely polarized protons is presented. These include the previously published HERMES results on Collins Sivers asymmetries, analysis which has been extended to also an extraction a three-dimensional kinematic binning enlarged phase space. They are complemented by corresponding for remaining four allowed one-photon-exchange...
Based on the notion that local dark-matter field of axions or axionlike particles (ALPs) in our Galaxy induces oscillating couplings to spins nucleons and nuclei (via electric dipole moment latter and/or paramagnetic axion-wind effect), we establish feasibility a new method search for ALPs storage rings. previous work allows us maintain in-plane polarization stored deuteron beam few hundred seconds, perform first proof-of-principle experiment at Cooler Synchrotron (COSY) scan momenta near...
This paper presents the successful application of a phase-lock feedback system to maintain resonance condition radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect 120 kHz precession in Cooler Synchrotron (COSY) storage ring. Real-time monitoring and filter signal allows relative phase between two be stabilized at arbitrary setpoint. The compensates for deviations by adjusting and/or as needed. With this method, variation demand standard deviation...
The spin structure functions of the proton and deuteron were measured during EG4 experiment at Jefferson Lab in 2006. Data collected for longitudinally polarized electron scattering off ${\mathrm{NH}}_{3}$ ${\mathrm{ND}}_{3}$ targets, ${Q}^{2}$ values as small 0.012 0.02 ${\mathrm{GeV}}^{2}$, respectively, using CEBAF Large Acceptance Spectrometer. This is archival paper that summarizes previously reported results ${g}_{1}$, ${A}_{1}{F}_{1}$, their moments...
The Hermes experiment has investigated the tensor spin structure of deuteron using $27.6\text{ }\text{ }\mathrm{GeV}/c$ positron beam DESY HERA. use a tensor-polarized gas target with only negligible residual vector polarization enabled first measurement asymmetry ${A}_{zz}^{d}$ and function ${b}_{1}^{d}$ for average values Bjorken variable $0.01<⟨x⟩<0.45$ negative squared four-momentum transfer $0.5\text{ }{\mathrm{GeV}}^{2}<⟨{Q}^{2}⟩<5\text{ }{\mathrm{GeV}}^{2}$. quantities are...
Longitudinal double-spin asymmetries of charged hadrons with high transverse momentum p T have been measured in electroproduction using the Hermes detector at Hera. Processes involving gluons nucleon enhanced relative to others by selecting typically above 1 GeV. In this kinematic domain gluon polarization has extracted leading order making use model embedded Monte Carlo Generator Pythia 6.2. The obtained from single inclusive range GeV < 2.5 a deuterium target is $ \frac{{\Delta...
Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These arise deeply virtual Compton scattering and Bethe-Heitler processes. From data extracted two in azimuthal distribution produced about direction exchanged photon: $$ {\mathcal{A}_{\text{UL}}} with respect to target polarisation {\mathcal{A}_{\text{LL}}} product beam polarisations. Results both compared predictions generalised parton model. The sin...
An earlier extraction from the HERMES experiment of polarization-averaged parton distribution strange quarks in nucleon has been reevaluated using final data on multiplicities charged kaons semi-inclusive deep-inelastic scattering obtained with a kinematically more comprehensive method correcting for experimental effects. General features are confirmed, but rise at low x is less pronounced than previously reported.
The basic properties of the proton, lightest baryon, are determined by its quark and gluon composition. In particular, spin $\mathrm{\ensuremath{\Elzxh}}/2$ has been a challenge to understand in terms proton's constituents. comprehensive results presented here based on measurements with high precision dense kinematic coverage carried out CLAS detector at Jefferson Lab. They provide new insight into proton substructure resolutions length scale whole nucleon down level. A variety strong...
This Letter reports the successful use of feedback from a spin polarization measurement to revolution frequency $0.97\text{ }\text{ }\mathrm{GeV}/c$ bunched and polarized deuteron beam in Cooler Synchrotron (COSY) storage ring order control both precession rate ($\ensuremath{\approx}121\text{ }\mathrm{kHz}$) phase horizontal component. Real time synchronization with radio (rf) solenoid made possible rotation out plane, yielding demonstration method manipulate polarization. In particular,...
Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this true, then hyperon-nucleon interactions will play a significant part star equation state (EOS). Yet, compared other elastic scattering processes, there very little data $\Lambda$-$N$ scattering. This experiment utilized CLAS detector study $\Lambda p \rightarrow \Lambda p$ cross section incident $\Lambda$ momentum range 0.9-2.0 GeV/c. first reaction several decades. The new sections have...