Energy and angular resolution of a new concept nano-satellite MeV telescope

The electromagnetic spectrum in the high-energy band is object of observation by both space and ground-based telescopes, but at energies around about 1 MeV we unfortunately have only the contribution that the COMPTEL detector left us. The detector was onboard the Compton Gamma-Ray Observatory (CGRO) which has been deorbited in the year 2000 after 9 years of observations. In this energy band, between 0.1 and 10 MeV, the dominant interaction is the Compton scattering. The time-scale for the realization of a new Compton telescope is about 10 years and a cost of about half a billion Euros, but on a much shorter time-scale (about 18 months) and with a much lower cost, equal to about half a million Euro, it is possible to send a nano-satellite MeV telescope into orbit. Of course, this satellite will have lower capabilities than a larger telescope, but it will be a source of considerable information and a test bench for algorithms and technologies for future larger missions.