The Reaction Cross Section of Nitrogen 14 for Protons between 220 and 600 kev

Citation

Pixley, Ralph Edward (1957) The Reaction Cross Section of Nitrogen 14 for Protons between 220 and 600 kev. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/7Y5Z-6383. https://resolver.caltech.edu/CaltechETD:etd-07152004-144605

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The yield of the reaction [...] was measured between 220 and 650 kev using targets of beryllium nitride and tantalum nitride. The relative yield obtained by counting positrons was normalized to the absolute measurement at 285 kev of the annihilation radiation and prompt gamma-ray yields. Target composition was determined from elastic scattering measurements and from the yield of the [...] reaction. The cross section for the [...] reaction was determined from 220 to 285 kev and from 400 to 600 kev. A resonance in the reaction was observed at [...] kev with a width of [...]. The spectrum of prompt gamma rays was observed. The ratio of yield at 0 and 90 degrees was [...] for the 0.75 Mev radiation and [...] for the 1.34 Mev radiation. The 7.6 Mev radiation was less than 10% of the 6.26 Mev radiation. The cross section for [...] was measured from 200 to 650 kev at 152 degrees. Measurements at 90, 125 and 152 degrees near the 278-kev resonance indicate that the 7.61 Mev state in O15 is [...]. Energy levels below 9 Mev in N15 and O15 are compared. It is found that one level near 7 Mev in N15 has not been detected in O15. Extrapolation of the cross section to lower energies is uncertain due to this undetected level. The rate of the CN-cycle is discussed.

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