Abstract
The photoproduction of neutral pions on 9Be, 12C and 16O at 166 MeV is discussed using the impulse approximation and the theoretical amplitudes of Chew et al., Berends et al. and Schwela. The best χ 2 fits with experiments are obtained using oscillator wave functions and varying the nuclear radius as a parameter. This leads to the values R = 2.29 fm for 9 Be, R = 2.51 fm for 12 C and R = 2.26 fm for 16 O .
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