Photoproton Reaction inBe9

The reaction ${\mathrm{Be}}^9(\gamma , p){\mathrm{Li}}^8$ was measured from threshold (16.89 Mev) up to 57 Mev using the bremsstrahlung beam from the Iowa State University electron synchrotron. The data were taken in energy steps of ∼0.050 Mev for the first several Mev and in energy steps of ∼1.0 Mev for the remainder of the yield curve. A number of small resonances near threshold was observed. The giant resonance cross section reaches a peak value of 2.64±0.30 mb at an energy of 23 Mev, and it possesses a large high-energy tail. The integrated cross section to 56.8 Mev is 41.4±4.6 Mev-mb.