The wavelength of the 57Fe Mössbauer radiation is measured with a relative uncertainty of 0.19 ppm by using almost exact Bragg backscattering from a reference silicon crystal. Its value is determined as lambda(M) = 0.860 254 74(16)x10(-10) m. The corresponding Mössbauer photon energy is...
In the energy range from 1 to 30 MeV the direction of gamma-rays can be obtained with a Compton telescope. Up to the early 1970s, this energy range was considered as an impossible range for gamma-ray observations. A Compton telescope consists of 2 detector layers: the incoming gamma-ray ...
We investigate the emission region for the multi-wavelength light curve using outer gap model. We assume that gamma-ray and non-thermal X-ray photons are emitted from a particle acceleration region in the outer magnetosphere, and UV/optical photons originate above that region. We also assume ...
Context. Gamma-ray emission at energies ≥100 MeV has been detected from nine novae using the Fermi Large Area Telescope (LAT), and can be explained by particle acceleration at shocks in these systems. Eight out of these nine objects are classical novae in which interaction of the ejecta with...
whereK,λ,θandβare a constant, the X-ray wavelength, the reflectance angle, and the full width at half maximum respectively. The crystallite size (D) had an average value of 13 nm. Figure1b displays the XRD patterns for Fe2O3/ (PVA/PVP) nanocomposites. The PVA semi-crystalline polym...
As for optical and X-ray transitions, the gamma-ray wavelength λ and diffraction angle θ are related by the Bragg law: nλ = 2d sin θ, where the lattice spacing d is known to an accuracy of 1 part in 1010 and n is the order of diffraction. Clearly, the resolution scales with n...
Gamma ray spectrometers are devices that measure the energy of gamma rays emitted by radioactive elements, allowing for the identification of specific elements like potassium, uranium, and thorium based on their energy peaks in the spectrum.
The optical transmittance for a 3 mm thick crystal exceeded 65% when the wavelength was over 600 nm and exceeded 80% when over 1000 nm (Fig.1c). The high transmittance indicates that the as-grown single crystals do not have any significant concentration of optical absorption or scatter...
no scintillator required) due to the think depletion layer (≥100 μm) in front of the amplification region; and this APD is sensitive to weak scintillation photons from γ-ray interactions with scintillators at a high QE of ∼80% at ∼500 nm of scintillation photon wavelength (Tanaka et...
Gamma-Ray Observatories are scientific facilities in space that detect and study high-energy gamma-ray emissions from celestial sources, providing valuable data on a wide range of astronomical phenomena such as Active Galactic Nuclei and blazars. AI generated definition based on: Advances in Space Res...