Abstract
The absolute differential cross sections for the elastic scattering of protons by and have been measured with a probable error of 7%. The cross section for was measured at a center-of-mass angle of 152° 36′ for proton energies from 600 to 2000 kev. A marked scattering anomaly is observed at a proton energy of 675 () kev. The cross section for was measured at a center-of-mass angle of 152° for proton energies from 850 to 1900 kev. Scattering anomalies were observed at proton energies 1.060 (), 1.555 (), 1.740 ( or ) and 1.803 ( or ) Mev. The indicated spin and parity assignments for the corresponding levels in the compound nucleus are consistent with the results of this experiment. The off-resonance cross sections exhibit marked variations from the Rutherford cross sections over the entire range of energies studied.
- Received 23 March 1956
DOI:https://doi.org/10.1103/PhysRev.103.196
©1956 American Physical Society