Cosmic Rays - New poster from STFC
Cosmic rays were first discovered by the Austrian-born physicist Victor Hess in 1912. Making a balloon flight, he measured the level of ionising radiation in the atmosphere and found that it increased with altitude. He concluded that the radiation was non-terrestrial in origin.
Later, people realised that cosmic rays were charged particles because they were affected by a magnetic field. In fact, the field of particle physics originated in cosmic-ray research: the first exotic particles identified – the muon, pion, positron, lambda and kaon – were all discovered in cosmic rays.
Today, high-energy cosmic rays are still used to make unique particlephysics measurements at energies well above those attained in laboratory accelerators.
Copies can be ordered free to UK addresses from STFC here>
You can download a copy and the teacher's notes from the link below.Downloads: