In all high energy acceleration scenarios, in machines or in the cosmos, a large number of secondary particles are produced as a result of energetic collisions between the accelerating particles and remnant gas or matter. The bulk of the produced particles are highly unstable and short lived. After their decay a large fraction of the stable end products consist of high energy neutrinos of different kinds and of gamma rays (photons).

Of these two kinds of electrically neutral radiation only the neutrinos are able to traverse the large distances between galaxies and even from distant galaxies to us unaffected. They are therefore particularly suitable for a systematic search of the sources of the cosmic radiation and to study the hitherto unknown acceleration mechanisms.

Here we will consider only one of the three kinds of neutrinos, the muonic neutrinos and their antiparticles.