The Instrument In FLAX For Very High Energy Resolution And First Direct Measurements Of Phonon Dispersion Curves With X-Rays

1989 ◽  
Author(s):  
E. Burkel
Keyword(s):  
Energy Resolution ◽  
Phonon Dispersion ◽  
High Energy ◽  
Dispersion Curves ◽  
High Energy Resolution ◽  
X Rays ◽  
Phonon Dispersion Curves ◽  
Direct Measurements ◽  
Very High Energy ◽  
Very High

High-energy resolution in X-ray scattering with the spectrometer INELAX. I. The principles and the test instrument

1991 ◽  
Vol 24 (6) ◽  
pp. 1042-1050 ◽  
Author(s):  
E. Burkel ◽  
B. Dorner ◽  
Th. Illini ◽  
J. Peisl
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
Bragg Angle ◽  
High Energy Resolution ◽  
X Rays ◽  
Test Results ◽  
X Ray Scattering ◽  
Radiation Sources ◽  
Very High Energy ◽  
Very High

Very high-energy resolution measurements using X-rays can be achieved by extreme backreflection (Bragg angle close to 90°) from perfect crystals. This technique, combined with the high intensity of X-rays emitted by synchrotron-radiation sources, allowed the development of the instrument INELAX for inelastic scattering experiments. The principles and test results are discussed.

Low-temperature high-Z gamma-detectors with very high energy resolution

2001 ◽  
Author(s):  
Carlos Pobes ◽  
Chiara Brofferio ◽  
Carlo Bucci ◽  
Oliviero Cremonesi ◽  
Ettore Fiorini ◽  
...  
Keyword(s):  
Low Temperature ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Very High Energy ◽  
Very High ◽  
Gamma Detectors

Ultrahigh-Energy-Resolution Inelastic X-Ray Scattering Spectroscopy

1993 ◽  
Vol 48 (1-2) ◽  
pp. 289-294 ◽  
Author(s):  
E. Burkel
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
Bragg Angle ◽  
High Energy Resolution ◽  
X Rays ◽  
Ultrahigh Energy ◽  
X Ray Scattering ◽  
Energy Transfers ◽  
Very High Energy ◽  
Matter Energy

Abstract Very-high-energy-resolution measurements using X-rays can be achieved by extreme backreflection (Bragg angle close to 90°) from perfect crystals. This technique allowed the development of the instrument INELAX for inelastic scattering experiments at the HARWI wiggler at DORIS, DESY Hamburg. Recently, a high energy resolution of 9 meV could be achieved, and the instrument proved to be an excellent tool to investigate collective excitations in condensed matter. Energy transfers from 10 meV to 12 eV and wave vectors up to about 10 Â-1 are accessible.

Fano Factor Determination For CZT

1997 ◽  
Vol 487 ◽  
Author(s):  
R. H. Redus ◽  
J. A. Pantazis ◽  
A. C. Huber ◽  
V. T. Jordanov ◽  
J. F. Butler ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Fano Factor ◽  
High Energy ◽  
High Resolution Spectroscopy ◽  
High Energy Resolution ◽  
X Rays ◽  
A Value ◽  
Very High Energy ◽  
Gamma Ray Detector ◽  
Very High

AbstractContinued improvements in the manufacturing of Cd1−xZnxTe (CZT) material have resulted in a practical thermoelectrically cooled X-ray and gamma-ray detector of very high energy resolution. A high resolution spectroscopy system was used to measure the Fano factor in CZT at temperatures down to -40°C. The best resolution of the 5.9 keV 55Fe peak was measured to be 188 eV FWHM, while the best resolution of the 59.5 keV 241Am peak was measured to be 482 eV FWHM. The minimum measured Fano factor was 0.082, with several measurements yielding a value of 0.089±0.005. With a resolution of 4.2 keV FWHM for the 662 keV peak of 137Cs, these detectors demonstrate excellent performance in detecting X-rays and gamma rays.

Proposal for a chopper spectrometer with very high energy resolution

2002 ◽  
Vol 74 (0) ◽  
pp. s1598-s1600 ◽  
Author(s):  
K. Ohoyama ◽  
S. Itoh ◽  
T. Otomo ◽  
T. Osakabe ◽  
J. Suzuki ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Very High Energy ◽  
Very High

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.

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