Future directions in experimental gamma ray astronomy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Emission Spectra, Gamma Ray Astronomy, Spectrometers, Technology Assessment, Angular Resolution, Background Radiation, Compton Effect, Continuous Spectra, Cosmic Rays, Line Spectra

Scientific paper

Better vehicles and instruments are needed if gamma ray spectroscopy in astrophysics and cosmology is to advance. A gamma ray observatory will (1) permit long-term observations of selected sources to measure their variability and to achieve high sensitivity; (2) measure periods in days or weeks; and (3) assess the entire sky to observe various predicted sources, to measure the energy spectrum, and to map the isotropy of the cosmic ray background over larger collecting areas (of the order of a square meter). Conventional and unconventional instruments must cover the energy range from 0.1 MeV to 20 MeV with improved sensitivity. Angular resolution must be improved one degree or more to study discrete X-ray sources in the galactic center. Actively collimated detectors, improved double Compton instruments, and gamma ray correlators to actively synthesize the absolute energy spectrum of the sky protons are discussed as well as the need for scientific balloons.

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