Photoproton Cross Sections of Carbon
- 15 May 1959
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 114 (4), 1101-1109
- https://doi.org/10.1103/physrev.114.1101
Abstract
The partial () cross section of carbon in which the residual boron nucleus is left in the ground state has been measured with a thin-crystal proton spectrometer. This cross section is shown to decrease from about 10 mb at the giant resonance peak (22 Mev) to about 0.1 mb near 60-Mev photon energy. Angular distributions measured at five energies exhibit an asymmetry around 90° which increases rapidly with increasing energy. The partial cross section to the first excited state of boron is (7±16)% of the ground-state cross section. The partial cross section to one or more excited states of boron about 5 Mev above the ground state is comparable with the ground-state cross section above 30-Mev photon energy. In addition to the cross-section data, the measurements provide a sensitive means of calibrating the energy scales of electron accelerators at energies in the 25- to 50-Mev region.
Keywords
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