Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1950
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950phrv...77..197h&link_type=abstract
Physical Review, vol. 77, Issue 2, pp. 197-204
Astronomy and Astrophysics
Astrophysics
19
Scientific paper
A low voltage accelerator and high current ion source has been used to determine the cross section of the reaction C12(pγ)N13 over the energy range from 88 to 128 kev. A counter arrangement is described which detects 26 percent of all the positrons from the decay of the N13 produced in the reaction and which has a low background rate of 5.5 counts per minute. With this accelerator and detector, yields of the order of 10-16 positron per proton and cross sections as low as 10-10 barn or 10-34 cm2 can be measured with errors of the order of +/-20 percent. The cross section for the C12(pγ)N13 reaction has been found to fit the semi-empirical expression σ=0.0024E-1exp[-6E-12] barn with E in Mev over the energy range measured. This is in satisfactory agreement with the Breit-Wigner one-level dispersion formula using constants determined at the 456-kev resonance. The astrophysical implications of these results in connection with the carbon-nitrogen cycle of nuclear reactions in stellar interiors are discussed.
Fowler William Alfred
Hall Robert Noel
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