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KleinEm‰È‚ÌŽ®‚ÌŒvŽZ(90‹ŽU—ŒÀ’è)
KleinEm‰È‚ÌŽ®($\theta \approx 90^\circ$‚ÌŽž)
$\left. \frac{d \sigma}{d \Omega} \right|_{ \theta = 90 ^{ \circ } }=
\frac{1}{2}
Zr_e^2\left(\frac{1}{1 + \alpha}\right)^2
\left\{1+\frac{\alpha^2}{(1+\alpha) }\right\}$
$\alpha=\frac{E_\gamma}{m_e c^2}$
‚ðŒvŽZ‚µ‚Ü‚·B