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Resolution in scattering experiments

  1. Jun 21, 2010 #1
    Here are two exercises:

    1. ) The proton radius is 0.8fm. What energy electron beam do you need for this resolution, if the target is liquid H2?

    2.) A pion radius is 0,65fm. What energy pion beam do you need for this resolution by scattering on the electrons of a stationary target(pi-e scattering)? Why is the beam energy so different than in the previous exercise?

    ------

    Now, i guess the main point in both cases is that the dr Broglie wavelength of the bombarding particle is the best resolution one can achieve. But, if I just go with de Broglie wavelength = spatial resolution , then I get approx. 1,5GeV and 1,9GeV respectively, which is not that different, so I don't understand the necessity of the last question. Also, I don't think the target material is important. Can someone clarify this?
     
  2. jcsd
  3. Jun 21, 2010 #2
  4. Jun 21, 2010 #3
    That just mean that hbar c = 197 MeV fm, I know that, and it does not answer my question.
     
  5. Jun 21, 2010 #4
  6. Jun 21, 2010 #5
    Yes I know, but since for the pion bombarding I get pc = 1,9 GeV and m=140MeV
    => pc approx E

    Now, if I have to transform to the C.M. frame (which is approximately the pion rest frame in this case) that may make a difference, but why should I do that?
     
  7. Jun 21, 2010 #6
    The real physics is usually in the CM reference frame.

    Bob S
     
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