COSMIC PHOTON AND POSITRON SPECTRA MEASUREMENTS MODELLING WITH THE AMS-02 DETECTOR AT ISS

2002 ◽  
Vol 17 (12n13) ◽  
pp. 1817-1828 ◽  
Author(s):  
VITALI CHOUTKO ◽  
GIOVANNI LAMANNA ◽  
ALEXANDER MALININ
Keyword(s):  
Systematic Study ◽  
Angular Resolution ◽  
Cosmic Ray ◽  
Opening Angle ◽  
Signal Ratio ◽  
Broad Energy Range ◽  
Maximal Opening ◽  
Background Events ◽  
Measurement Capabilities ◽  
Broad Energy

The results of the MC feasibility study of the AMS-02 Detector cosmic-ray γ and e+ spectra measurement capabilities are presented. AMS will be able to provide accurate measurements of the above spectra in a broad energy range (up to hundreds of GeV) with energy resolution of a few percent and angular resolution of 0.01-1°. The acceptance of 0.05-0.15 m2sr has been estimated both for e+ and γ, with maximal opening angle being 20° to 45°. The systematic study of the background events has been done, the irreducible background to signal ratio below a few percent being obtained.

scholarly journals Molecular Clouds Observed by the EGRET Gamma-Ray Telescope

1997 ◽  
Vol 170 ◽  
pp. 22-24 ◽  
Author(s):  
Seth. W. Digel ◽  
Stanley D. Hunter ◽  
Reshmi Mukherjee ◽  
Eugéne J. de Geus ◽  
Isabelle A. Grenier ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Molecular Clouds ◽  
Gamma Ray ◽  
Angular Resolution ◽  
Cosmic Ray ◽  
High Energy ◽  
Background Rejection ◽  
Γ Rays ◽  
Γ Ray ◽  
Production Mechanisms

EGRET, the high-energy γ-ray telescope on the Compton Gamma-Ray Observatory, has the sensitivity, angular resolution, and background rejection necessary to study diffuse γ-ray emission from the interstellar medium (ISM). High-energy γ rays produced in cosmic-ray (CR) interactions in the ISM can be used to determine the CR density and calibrate the CO line as a tracer of molecular mass. Dominant production mechanisms for γ rays of energies ∼30 MeV–30 GeV are the decay of pions produced in collisions of CR protons with ambient matter and Bremsstrahlung scattering of CR electrons.

scholarly journals Compton-Thick AGN in the NuSTAR ERA VII. A joint NuSTAR, Chandra, and XMM-Newton Analysis of Two Nearby, Heavily Obscured Sources

2021 ◽  
Vol 922 (2) ◽  
pp. 159
Author(s):  
A. Traina ◽  
S. Marchesi ◽  
C. Vignali ◽  
N. Torres-Albà ◽  
M. Ajello ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Energy Range ◽  
Active Galactic Nuclei ◽  
Column Density ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Line Of Sight ◽  
Broad Energy Range ◽  
Larger Sample ◽  
Broad Energy

Abstract We present the joint Chandra, XMM-Newton, and NuSTAR analysis of two nearby Seyfert galaxies, NGC 3081 and ESO 565-G019. These are the only two having Chandra data in a larger sample of 10 low-redshift (z ≤ 0.05), candidates Compton-thick (CT) Active Galactic Nuclei selected in the 15–150 keV band with Swift-BAT that were still lacking NuSTAR data. Our spectral analysis, performed using physically motivated models, provides an estimate of both the line-of-sight (l.o.s.) and average (N H,S ) column densities of the two torii. NGC 3081 has a Compton-thin l.o.s. column density N H,z = [0.58–0.62] × 1024 cm−2, but the N H,S , beyond the CT threshold (N H,S = [1.41–1.78] × 1024 cm−2), suggests a “patchy” scenario for the distribution of the circumnuclear matter. ESO 565-G019 has both CT l.o.s. and N H,S column densities (N H,z > 2.31 × 1024 cm−2 and N H,S > 2.57 × 1024 cm−2, respectively). The use of physically motivated models, coupled with the broad energy range covered by the data (0.6–70 keV and 0.6–40 keV, for NGC 3081 and ESO 565-G019, respectively) allows us to constrain the covering factor of the obscuring material, which is C TOR = [0.63–0.82] for NGC 3081, and C TOR = [0.39–0.65] for ESO 565-G019.

scholarly journals British plans for astronomy in Antarctica

1992 ◽  
Vol 9 ◽  
pp. 599-599
Author(s):  
R D Davies ◽  
J M Hough
Keyword(s):  
Gamma Rays ◽  
Small Area ◽  
Gamma Ray ◽  
Angular Resolution ◽  
State Of The Art ◽  
Austral Summer ◽  
Cosmic Ray ◽  
South Pole ◽  
Gamma Ray Astronomy ◽  
Air Shower

The South Pole air shower experiment (SPASE), a joint Bartol Research Institute and Leeds University project, has been operational since the austral summer of 1987/88. It is a cosmic ray telescope searching for cosmic gamma rays at energies up to 1000 TeV. Although it has a relatively small area (6800 m2), it is situated at an altitude of 2800 m and has a 24 hour coverage, making it very competitive. The angular resolution of 0.°8 at 200 TeV is state-of-the-art in gamma ray astronomy. The astronomical programme includes searches for gamma ray sources, searches for anisotropy in the cosmic ray sky and measuring the energy spectrum over the range 1014-1016 eV.

scholarly journals Integral Cross Sections for Electron–Magnesium Scattering Over a Broad Energy Range (0–5000 eV)

2018 ◽  
Vol 47 (4) ◽  
pp. 043104 ◽  
Author(s):  
R. P. McEachran ◽  
F. Blanco ◽  
G. García ◽  
P. W. Stokes ◽  
R. D. White ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Broad Energy Range ◽  
Broad Energy

Elastic scattering analysis of p+40Ca at incident energies from threshold to 48.4 MeV and nuclear matter radius

2015 ◽  
Vol 24 (07) ◽  
pp. 1550055
Author(s):  
Atef Ismail ◽  
Yen Cheong Lee ◽  
M Tammam
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Reaction Cross ◽  
Angular Distributions ◽  
Folding Potential ◽  
Density Distributions ◽  
Proton Elastic Scattering ◽  
Broad Energy Range ◽  
Broad Energy

Proton elastic scattering at various incident energies is one method to study nuclear density distributions and nuclear radii. Single folding potential describing the p-scattering on 40 Ca over a broad energy range 9–48.4 MeV is constructed. The resulting potential does not need any renormalization to fit the measured elastic scattering angular distributions and total reaction cross-sections. Furthermore, correlation between volume integral and proton incident energy is discussed. Theoretical calculations are in a good agreement with existing experimental data.

scholarly journals Theoretical study on positron scattering by benzene over a broad energy range

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Alessandra Souza Barbosa ◽  
Francisco Blanco ◽  
Gustavo García ◽  
M. H. F. Bettega
Keyword(s):  
Energy Range ◽  
Theoretical Study ◽  
Positron Scattering ◽  
Broad Energy Range ◽  
Broad Energy

Exploring nuclear photonics with laser driven neutron source

2021 ◽  
Author(s):  
Zechen Lan ◽  
Akifumi Yogo
Keyword(s):  
Neutron Source ◽  
Modern Science ◽  
Current Status ◽  
Science And Engineering ◽  
Broad Energy Range ◽  
Wide Range ◽  
New Type ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source ◽  
Broad Energy

Abstract Neutron beams have been providing dispensable tools for wide range of fields in modern science and engineering. Recently, a new type of pulsed neutron source has been developed, known as Laser-Driven Neutron Source (LDNS). The LDNSs utilize the laser-accelerated ions, including protons and deuterons as a primary beam and generate neutrons from a secondary target (lithium, beryllium, etc.) via nuclear reaction. Applying an additional moderator part, LDNSs can provide a broad energy range of neutrons (meV∼MeV). This paper aims to introduce the current status of LDNS and the results of application-oriented experiments implemented at Institute of Laser Engineering (ILE) of Japan.

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