Cross sections for production of the 15.10-MeV and other astrophysically significant gamma-ray lines through excitation and spallation of 12C and 16O with protons

Details Cross sections for production of the 15.10-MeV and other astrophysically significant gamma-ray lines through excitation and spallation of 12C and 16O with protons Cross sections for production of the 15.10-MeV and other astrophysically significant gamma-ray lines through excitation and spallation of 12C and 16O with protons

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvc..35.1214l&link_type=abstract

Physical Review C (Nuclear Physics), Volume 35, Issue 4, April 1987, pp.1214-1227

Physics

Nuclear Physics

28

Inelastic Proton Scattering, Angular Distribution And Correlation Measurements

Scientific paper

The ratio of the flux of 15.10-MeV gamma rays to the flux of 4.438-MeV gamma rays resulting from excitation of the corresponding states in 12C is a sensitive measure of the spectrum of the exciting particles produced in solar flares and other cosmic sources. These gamma rays are produced predominantly by interactions with 12C and 16O, both of which are relatively abundant in the solar photosphere. Gamma-ray production cross sections for proton interactions have been reported previously for all important channels except for the production of 15.10-MeV gamma rays from 16O. The first reported measurement of the 15.10-MeV gamma-ray production cross section from p+ 16O is presented here. A cyclotron was employed to produce 40-, 65-, and 85-MeV protons which interacted with CH2 and BeO targets. The resultant gamma-ray spectra were measured with a high-purity germanium semiconductor detector at 70, 90, 110, 125, and 140 deg relative to the direction of the incident beam for each proton energy. Other gamma-ray lines resulting from direct excitation and spallation reactions with 12C and 16O were observed as well, and their gamma-ray production cross sections, several of which have not been reported previously, are presented. The results are compared with previously reported measurements, as available.

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