G. Giordano
A5037226560- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Advanced Frequency and Time Standards
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Measurement and Metrology Techniques
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Advanced X-ray Imaging Techniques
- Laser Design and Applications
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Advanced Fiber Laser Technologies
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
University of Salerno
2010-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2004-2019
California Institute of Technology
2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2003-2016
Istituto Nazionale di Fisica Nucleare
1996-2016
University of Naples Federico II
2007-2009
Institut National de Physique Nucléaire et de Physique des Particules
2003
Centre National de la Recherche Scientifique
1982-2003
Université Paris Cité
2003
Université Paris-Sud
2003
We report on the status of Virgo detector, under commissioning. will focus last year's activity. The two commissioning runs performed during 2005 allowed us to reach a sensitivity h ∼ 6 × 10 −22 . data obtained were used test few analysis algorithms, namely coalescing binaries and burst searches. main improvements made detector this year be described, as well plans activities foreseen in coming years.
The Virgo gravitational wave detector is an interferometer with 3 km long arms in construction near Pisa to be commissioned the year 2000. has been designed achieve a strain sensitivity of few times at 200 Hz. A large effort gone into conception mirror suspension system, which expected reduce noise level 10 signals and main sources are briefly discussed; choices made illustrated together present status experiment.
New high-precision measurements of $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\pi})$ and $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma})$ cross sections beam asymmetries have been combined with other polarization ratios in a simultaneous analysis both reactions. Compton scattering has provided two important new constraints on the photopion amplitude. The $E2/M1$ mixing ratio for $N\ensuremath{\rightarrow}\ensuremath{\Delta}$...
Collisions of light photons with relativistic electrons have previously been used to produce polarized γ-ray beams modest (~10%) resolution, but relatively low intensity. In contrast, the LEGS project (Laser+Electron Gamma Source) at Brookhaven will a very high flux (>2×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> s xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> ) background-free γ rays whose energy be determined accuracy (ΔE...
The general structure of the cross section $\gamma N$ scattering with polarized photon and/or nucleon in initial final state is systematically described and exposed through invariant amplitudes. A low-energy expansion up to including terms order $\omega^4$ given which involves ten parameters (dipole, quadrupole, dispersion, spin polarizabilities). Their physical meaning discussed detail. Using fixed-t dispersion relations, predictions for these are obtained compared results chiral...
This paper presents the results of observations detectors participating in International Gravitational Event Collaboration (IGEC) from 1997 to 2000 and reviews data analysis methods. The is designed search for coincident excitations multiple detectors. set analyzed this article covers a longer period more complete than that given previous reports. current accurate determining false dismissal probability time coincidence it optimizes with respect target amplitude direction signal. statistics...
The VIRGO Central Interferometer (CITF) is a short suspended interferometer operated with the central area elements of detector. main motivation behind CITF to allow integration and debugging large part subsystems while construction long arms antenna being completed. This will permit faster commissioning full-size antenna. In fact, almost all components CITF, exception mirrors few other details, are same as those be used for this paper present status reported.
We report new high-precision measurements of $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma}),$ $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},{\ensuremath{\pi}}^{0})$ and $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},{\ensuremath{\pi}}^{+})$ cross section beam asymmetry angular distributions for photon energies in the range from 213 MeV to 333 MeV. The sections all three channels are locked together with a small common systematic...
The total cross section for deuteron photodisintegration has been measured in the $\ensuremath{\gamma}$-ray energy range between 15 and 75 MeV, by use of monochromatic LADON photon beam Frascati National Laboratories detection proton. results are substantial agreement with standard theory do not provide evidence contributions quark degrees freedom.
The network of resonant bar detectors gravitational waves resumed coordinated observations within the International Gravitational Event Collaboration (IGEC-2). Four are taking part in this Collaboration: ALLEGRO, AURIGA, EXPLORER and NAUTILUS. We present here results search for wave bursts over 6 months during 2005, when IGEC-2 was only observatory operation. implemented data analysis is based on a time coincidence among NAUTILUS; ALLEGRO reserved follow-up studies. amplitude sensitivity to...
The Baldin sum rule for the nucleon has been recalculated at light of most recent photoabsorption cross section measurements. proton value $(\ensuremath{\alpha}+\ensuremath{\beta}{)}_{p}=13.69\ifmmode\pm\else\textpm\fi{}0.14$ is smaller but consistent with one usually quoted in literature. However, neutron $(\ensuremath{\alpha}+\ensuremath{\beta}{)}_{n}=14.40\ifmmode\pm\else\textpm\fi{}0.66$ turns out to be three standard deviations away from previously calculated one.
The gravitational wave interferometer Virgo is presently in its commissioning phase. status of the detector will be presented, focusing attention on results obtained during this last year activity, running recombined configuration (a Michelson with Fabry–Perot cavities both arms) and finally recycling light beam into interferometer.
Resonant gravitational wave detectors with an observation bandwidth of tens hertz are a reality: the antenna Explorer, operated at CERN by ROG Collaboration, has been upgraded new readout. In this configuration, it exhibits unprecedented useful bandwidth: in over 55 Hz about its center operating frequency 919 spectral sensitivity is better than 10(-20) Hz(-1/2). We describe detector and discuss foreseeable upgrades to even larger bandwidths.
Results from three independent measurements of the p(\ensuremath{\gamma}\ensuremath{\rightarrow},${\mathrm{\ensuremath{\pi}}}^{0}$) reaction are presented for incident photon energies between 243 and 314 MeV, c.m. angles 105\ifmmode^\circ\else\textdegree\fi{}, 122\ifmmode^\circ\else\textdegree\fi{}, 150\ifmmode^\circ\else\textdegree\fi{}. The ratio cross sections measured with orthogonal states linear polarization is sensitive to E2 excitation \ensuremath{\Delta} resonace. Comparisons made...
We report the result from a search for bursts of gravitational waves using data collected by cryogenic resonant detectors EXPLORER and NAUTILUS during year 2001, total measuring time 90 days. With these we repeated coincidence performed on 1998 (which showed small excess) applying analysis algorithms based known physical characteristics detectors. 2001 new interesting excess is found when are favorably oriented with respect to Galactic Disk.
The reaction $^{2}(\ensuremath{\gamma}$,p)n has been studied using a monochromatic and polarized gamma ray beam at energies ${E}_{\ensuremath{\gamma}}$=19.8, 29.0, 38.6, 60.8 MeV. of an intensity \ensuremath{\sim}4\ifmmode\times\else\texttimes\fi{}${10}^{5}$ \ensuremath{\gamma}/sec was obtained by Compton back scattering mode-locked laser light off electron bunches in the Adone storage ring. Photoneutron yields were measured nine neutron angles...
New precision measurements of cross sections and polarization asymmetries in the $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},\ensuremath{\gamma}p)$ reaction at 90\ifmmode^\circ\else\textdegree\fi{} c.m. are presented for incident energies between 213 333 MeV. A long-standing problem with earlier experiments that appeared to violate unitarity peak \ensuremath{\Delta} is resolved. Data compared theories based on baryon resonance structure dispersion relations. Recent...
We present here the results of a 515 day search for short bursts gravitational waves by IGEC2 observatory. This network included 4 cryogenic resonant-bar detectors: AURIGA, EXPLORER, and NAUTILUS in Europe, ALLEGRO America. These cover time period from November 6th 2005 until April 15th 2007, partly overlapping first long term observations LIGO interferometric detectors. The observatory operated with high duty cycle, namely, 57% fourfold coincident observations, 94% threefold observations....
The asymmetries $\ensuremath{\Sigma}({\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=\frac{\ensuremath{\pi}}{2})$ for the reaction $^{2}\mathrm{H}(\ensuremath{\gamma},n)p$ have been measured with use of a monochromatic and linearly polarized $\ensuremath{\gamma}$-ray beam, obtained by backward Compton scattering laser light against high-energy electrons. Contributions from meson exchange currents must be included in theoretical calculations to reproduce our data.