In order to clear up a discrepancy in the existing absolute measurements of ($p, \gamma$) resonances, the proton energies at which strong fluorine and aluminum ($p, \gamma$) resonances occur were measured using a 36-in. radius absolute electrostatic analyzer and compared with measurements for the lowest energy fluorine resonance which had been measured previously using a 12-in. absolute electrostatic analyzer. An accuracy of one part in a thousand is claimed for both instruments and the disagreement was found to be less than 1.5 parts in a thousand. Weighted mean values of fluorine resonances, based on two analyzers, were found to be 340.7±0.3 kev, 484.3±0.3 kev, 873.5±0.7 kev, 1347.7±1.0 kev, and 1373.7±0.8 kev. These are compared with the values obtained by other workers in this field, and found to be in good agreement with those of Herb et al. and Bondelid et al. but discrepancies exist between the present measurements and those of Bumiller et al.

• Received 5 July 1960

DOI:https://doi.org/10.1103/PhysRev.120.1740