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 ...
The current status of observations and theoretical models of gamma-ray bursts and some other related transients, including ultra-long bursts and tidal disruption events, is reviewed. We consider the impact of multi-wavelength data on the formulation and development of theoretical models for the prompt...
After a short history of optical transient search and the BeppoSAX discoveries, the main topics included are prompt multiwavelength emission, dark bursts, spectral lines line and continuum variability, the early light curve behaviour, jet breaks, X-ray flares, late afterglow features, polarization, ...
What is the frequency of gamma ray radiation that has a wavelength of 1.00 x 10−16 m? Frequency = sec−1. Gamma Rays: Gamma rays are a form of electromagnetic radiation. Gamma rays have the highest energy within the electromagnetic spectrum. Consequentl...
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...
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...
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...
However, it is also clear that the 2 eV band cannot be ascribed to only one kind of defect center, because, as the OH-group content of the sample increases, the peak wavelength shifts from 630 nm to 600 nm 3,5 and the oscillator strength decreases 3 . Friebele et al. thus assumed ...
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...