1. A thin (1 mg/cm2) target of 48Ca is bombarded with a 1 0-nA beam of cc particles. A detector, subtending a solid angle of 2 x 10-3 steradians, records 15 protons per second. If the angular distribution is measured to be isotropic, determine the total cross section (in mb) for the 48Ca(α,p) reaction. Take the atomic mass of 48Ca to be 48 u.
3. Calculate the maximum energy a 5-MeV α particle can transfer to an electron initially at rest. Assume the α particle is infinitely massive compared with the electron.