TRIUMF 12C+12C simulation results: target thickness, beam spot size, angular distribution

Angular distributions of reaction protons and alphas, for last july's set-up:

energy distribution for alphas from ground state of ²⁰Ne:

...and for Ex=5.618 MeV:


What those energy distributions suggest is that it doesn't affect the energy resolution if we use 20 ug/cm² targets instead of 10 ug; also that the beam spot size isn't something to worry about. (these simulations don't take into account the incoming angle of the beam, which would be worsened by making the spot size smaller.)