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21-More reactions (Photon interactions in matter (consider photon…

- - - - photoelectric
      - compton scatting
      - pair production
- - - - single collisions between the incoming particle and a nucleon in the target nucleus in which the incident particle emerges with reduced energy
      - struck nucleon can also carry off most of the energy
    - - incming particle doesn't enter particle but excites it in passing
    - - proton enters nucleus and exchanges charge with one of the neutrons, leaving as a neutron
    - - nucleon collects a second one from the nucleus to form a deuteron
    - - incident deuteron or other light nucleus leaves one or more of its nucleons in the target nucleus