D. Martello
A5053440101- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- High-Energy Particle Collisions Research
- Atmospheric chemistry and aerosols
- Radiation Detection and Scintillator Technologies
- Vehicle emissions and performance
- Atomic and Subatomic Physics Research
- Air Quality and Health Impacts
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Precipitation Measurement and Analysis
- Nanofluid Flow and Heat Transfer
- Ionosphere and magnetosphere dynamics
- Thermochemical Biomass Conversion Processes
- Coal and Its By-products
- Iron oxide chemistry and applications
- Computational Physics and Python Applications
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2016-2025
University of Salento
2016-2025
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2006-2019
Universidad Nacional de La Plata
2011-2017
Consejo Nacional de Investigaciones Científicas y Técnicas
2011-2017
University of Lisbon
2016-2017
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2016-2017
Institute of Physics Rosario
2011-2016
University of Buenos Aires
2011-2016
Institute of Scientific and Technical Research for Defense
2016
We present a measurement of the flux neutrino-induced upgoing muons (<Eν>∼ 100 GeV) using MACRO detector. The ratio number observed to expected events integrated over all zenith angles is 0.74 ±0.036 (stat) ±0.046 (systematic) ±0.13 (theoretical). distribution for −1.0≤cosθ≤−0.1 does not fit well with no oscillation expectation, giving maximum probability χ2 0.1%. acceptance detector has been extensively studied downgoing muons, independent analyses and Monte Carlo simulations. other...
The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission Galactic plane at longitudes 25° < l 100° and latitudes . energy range covered this analysis, from ∼350 GeV ∼2 TeV, allows connection region explored Fermi with multi-TeV measurements carried out Milagro. Our analysis has focused on two selected regions plane, i.e., 40° 65° 85° (the Cygnus region), where Milagro observed an excess respect predictions...
The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below MACRO detector show anomalies good agreement with two flavor neutrino-mu ==> neutrino-tau oscillations maximum mixing and Delta m**2 around 0.0024 eV**2. Exploiting dependence magnitude matter effect on oscillation channel, using a set 809 observed MACRO, we that neutrino-sterile is disfavored 99% C.L. respect to neutrino-tau.
The vertical underground muon intensity has been measured in the slant depth range 3200–7000 hg cm−2 (standard rock) with completed lower part of MACRO detector at Gran Sasso laboratory, using a large sample data. These observations are used to compute surface flux and primary ''all-nucleon'' spectrum. An analysis systematic uncertainties introduced by interaction models atmosphere propagation muons is presented. A comparison our results published data also presented.Received 3 April...
In this paper the design, construction and performance of lower part first supermodule MACRO detector is described.
The ARGO-YBJ detector is an extensive air shower array that has been used to monitor the northern $\gamma$-ray sky at energies above 0.3 TeV from 2007 November 2013 January. In this paper, we present results of a survey in declination band $-10^{\circ}$ $70^{\circ}$, using data recorded over past five years. With integrated sensitivity ranging 0.24 $\sim$1 Crab units depending on declination, six sources have detected with statistical significance greater than 5 standard deviations. Several...
Measuring the anisotropy of arrival direction distribution cosmic rays provides important information on propagation mechanisms and identification their sources. In fact, flux is thought to be dependent only due presence nearby ray sources or particular magnetic-field structures. Recently, observation unexpected excesses at TeV energy down an angular scale as narrow $\ensuremath{\sim}10\ifmmode^\circ\else\textdegree\fi{}$ raised possibility that problem origin Galactic may addressed by...
Using 5.33 × 106 single muons collected in 1.46 104 live hours by MACRO during the period 1991–1994, we have searched for a correlation between variations underground muon rate, Nμ, and seasonal temperature atmosphere. These correlations are found to be present with high statistical significance. Analysis of relatively complete December 1992–December 1994 subset data yields value coefficient, αT = (TNμ)(∂Nμ∂T) 0.83±0.13. total set gives consistent results. We compared this result hypothesis...
The energy of atmospheric neutrinos detected by MACRO was estimated using multiple Coulomb scattering upward throughgoing muons. This analysis allows a test neutrino oscillations, relying on the distortion muon distribution. These results have been combined with those coming from angular distribution only. Both analyses are independent flux normalization and provide strong evidence, above 4σ level, in favour oscillations.
Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called shadow). The shadow an important tool to determine performance of air shower array. Indeed, westward displacement center, due bending effect geomagnetic field on propagation cosmic rays, allows setting absolute rigidity scale primary particles inducing showers recorded detector. In addition, shape permits detector point spread function, while position at high energies evaluation pointing accuracy....
ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It operated high duty cycle and large field view. continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report long-term monitoring Mrk 421 over period from 2007 November to 2010 February. This source was observed by satellite-borne experiments Rossi X-ray Timing Explorer Swift in band. especially active first half 2008. Many flares are both γ-ray bands...
Abstract Invert emulsions are used to drill for oil and gas when good wellbore stability high temperature tolerance required. These drilling fluids contain a solid phase two immiscible liquid phases stabilised with polymeric surfactant. In ultra deep drilling, due temperature, the surfactant degrades causing separation. However, fine particles can be as stabilisers, result is Pickering emulsion. Here, we demonstrate that use of combination hydrophobic nanoparticles organically modified...
As one of the brightest active blazars in both X-ray and very high energy $\gamma$-ray bands, Mrk 501 is useful for physics associated with jets from AGNs. The ARGO-YBJ experiment monitoring it $\gamma$-rays above 0.3 TeV since November 2007. Starting October 2011 largest flare 2005 observed, which lasts to about April 2012. In this paper, a detailed analysis reported. During flaring episodes 17 22, 2011, an excess event rate over 6 $\sigma$ detected by direction 501, corresponding increase...
The extended TeV gamma-ray source ARGO J2031+4157 (or MGRO J2031+41) is positionally consistent with the Cygnus Cocoon discovered by Fermi-LAT at GeV energies in superbubble. Reanalyzing ARGO-YBJ data collected from 2007 November to 2013 January, angular extension and energy spectrum of are evaluated. After subtracting contribution overlapping sources, excess map fitted a two-dimensional Gaussian function square region 10° × 10°, finding σext= 18 ± 05. observed differential dN/dE = (2.5 0.4)...
We report on the first measurement of flux upgoing muons resulting from interactions atmospheric neutrinos in rock below MACRO. The ratio observed to expected number events integrated over all nadir angles is 0.73 ± .09stat. .06sys. .12theor.. as a function angle presented and compared Monte Carlo expectations. At 90% confidence level, data are consistent with no neutrino oscillations or some possible oscillation hypothese parameters suggested by Kamiokande contained-event analysis.
The proton-air cross section in the energy range 1--100 TeV has been measured by ARGO-YBJ cosmic ray experiment. analysis is based on primary flux attenuation for different atmospheric depths (i.e. zenith angles) and exploits detector capabilities of selecting shower development stage means hit multiplicity, density lateral profile measurements at ground. effects fluctuations, contribution heavier primaries uncertainties hadronic interaction models, have taken into account. results used to...
We report the observation of TeV gamma-rays from Cygnus region using ARGO-YBJ data collected 2007 November to 2011 August. Several sources are located in this including two bright extended MGRO J2019+37 and J2031+41. According Milagro set, at 20 is most significant source apart Crab Nebula. No signal detected by experiment, derived flux upper limits 90% confidence level for all events above 600 GeV with medium energy 3 lower than flux, implying that might be variable hard identified as a...