A thin 1 mgcm2 target of 48ca is bombarded with a 1 0-na

Question

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.