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<p class="MsoNormal">I have one more idea for HyCal calibration. If we use pi0 photoproduction, we simultaneously will have Compton scattering on atomic electrons. Remember we did this in PrimEx with the dipole magnet off. Nice 2-body reaction.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">-Eugene</span><o:p></o:p></p>
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