scholarly journals Hard-Photon Emission in High Energy  e Scatterings

1981 ◽  
Vol 66 (6) ◽  
pp. 2234-2248 ◽  
Author(s):  
K.-i. Aoki ◽  
Z. Hioki
Keyword(s):  
Photon Emission ◽  
High Energy ◽  
Hard Photon

scholarly journals Monitoring of the radio galaxy M 87 at Very High Energy with MAGIC during a low emission state between 2012 and 2015

2016 ◽  
Vol 12 (S324) ◽  
pp. 164-167
Author(s):  
C. Arcaro ◽  
P. Bangale ◽  
M. Manganaro ◽  
D. Mazin ◽  
P. Colin ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
Spectral Energy Distribution ◽  
Photon Emission ◽  
High Energy ◽  
Spectral Energy ◽  
X Rays ◽  
Low Emission ◽  
Very High Energy ◽  
Alternative Scenarios ◽  
Very High

AbstractWe present the preliminary results from observing the nearby radio galaxy M 87 for 156 hours (between the years 2012 and 2015) with the MAGIC telescopes, which lead to a significant very high energy (VHE, E > 100 GeV) detection of the source in quiescent states each year. Our VHE analysis combined with quasi-simultaneous data at other energies (from gamma-rays, X-rays, optical and radio) provides a unique opportunity to study the source variability and its broadband spectral energy distribution, which is found to disfavour a one-zone synchrotron/synchrotron self-Compton model. Therefore, other alternative scenarios for the photon emission are explored. We also find that the VHE emission is compatible with being produced close to the source radio core as previous data already indicated. A detailed paper presenting full results of the observing campaign is in preparation.

scholarly journals FAINT HIGH-ENERGY GAMMA-RAY PHOTON EMISSION OF GRB 081006A FROMFERMIOBSERVATIONS

2011 ◽  
Vol 745 (1) ◽  
pp. 72 ◽  
Author(s):  
WeiKang Zheng ◽  
Carl W. Akerlof ◽  
Shashi B. Pandey ◽  
Timothy A. McKay ◽  
BinBin Zhang ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Photon Emission ◽  
High Energy ◽  
High Energy Gamma ◽  
Energy Gamma

scholarly journals SIMULATING THREE-DIMENSIONAL NONTHERMAL HIGH-ENERGY PHOTON EMISSION IN COLLIDING-WIND BINARIES

2014 ◽  
Vol 789 (1) ◽  
pp. 87 ◽  
Author(s):  
K. Reitberger ◽  
R. Kissmann ◽  
A. Reimer ◽  
O. Reimer
Keyword(s):  
Photon Emission ◽  
Three Dimensional ◽  
High Energy ◽  
High Energy Photon ◽  
Energy Photon

Concept of the high-energy photon emission from the wire array Z-pinch

2001 ◽  
Author(s):  
P. Kubes ◽  
J. Kravarik ◽  
D. Klir ◽  
Yu. L. Bakshaev ◽  
P. I. Blinov ◽  
...  
Keyword(s):  
Wire Array ◽  
Photon Emission ◽  
High Energy ◽  
High Energy Photon ◽  
Energy Photon ◽  
The Wire ◽  
Z Pinch

Relative Performance of a TGS for the Assay of Drummed Waste as Function of Collimator Opening

2007 ◽  
Author(s):  
S. C. Kane ◽  
S. Croft ◽  
P. McClay ◽  
R. Venkataraman ◽  
M. F. Villani
Keyword(s):  
Dynamic Range ◽  
Photon Emission ◽  
High Energy ◽  
General Purpose ◽  
Nuclear Industry ◽  
High Energy Resolution ◽  
Waste Forms ◽  
Trade Offs ◽  
The Impact ◽  
Scan Pattern

Improving the safety, accuracy and overall cost effectiveness of the processes and methods used to characterize and handle radioactive waste is an on-going mission for the nuclear industry. An important contributor to this goal is the development of superior non-destructive assay instruments. The Tomographic Gamma Scanner (TGS) is a case in point. The TGS applies low spatial resolution experimental computed tomograghy (CT) linear attenuation coefficient maps with three-dimensional high-energy resolution single photon emission reconstructions. The results are presented as quantitative matrix attenuation corrected images and assay values for gamma-emitting radionuclides. Depending on a number of operational factors, this extends the diversity of waste forms that can be assayed, to a given accuracy, to items containing more heterogeneous matrix distributions and less uniform emission activity distributions. Recent advances have significantly extended the capability to a broader range of matrix density and to a wider dynamic range of surface dose rate. Automated systems sense the operational conditions, including the container type, and configure themselves accordingly. The TGS also provides a flexible data acquisition platform and can be used to perform far-field style measurements, classical segmented gamma scanner measurements, or to implement hybrid methods, such as reconstructions that use a priori knowledge to constrain the image reconstruction or the underlying energy dependence of the attenuation. A single, yet flexible, general purpose instrument of this kind adds several tiers of strategic and tactical value to facilities challenged by a diverse and difficult to assay waste streams. The TGS is still in the early phase of industrial uptake. There are only a small number of general purpose TGS systems operating worldwide, most being configured to automatically select between a few configurations appropriate for routine operations. For special investigations, one may wish to widen the repertoire but there is currently little guidance as to the trade-offs involved. In this work, we address this weakness by studying the performance of a typical TGS arrangement as a function of collimator opening, scan pattern and scan time for a representative selection of simulated waste forms. Our focus is on assessing the impact on the precision and accuracy of the quantitative assay result but we also report the utility of the imaging information in confirming acceptable knowledge about the packages.

High‐Energy Photon Emission in the Early Afterglow of GRBs

2005 ◽  
Vol 633 (2) ◽  
pp. 1018-1026 ◽  
Author(s):  
Asaf Pe’er ◽  
Eli Waxman
Keyword(s):  
Photon Emission ◽  
High Energy ◽  
High Energy Photon ◽  
Energy Photon

Hard-photon emission inXe129+197Au reaction at 44 MeV/nucleon

1993 ◽  
Vol 48 (6) ◽  
pp. 2926-2930 ◽  
Author(s):  
Giuseppe Russo
Keyword(s):  
Photon Emission ◽  
Hard Photon
Sign in / Sign up

Export Citation Format

Share Document