Hall, Robert Noel and Fowler, William Alfred (1950) The cross section for the radiative capture of protons by C12 near 100 Kev. Physical Review, 77 (2). pp. 197-204. ISSN 0031-899X http://resolver.caltech.edu/CaltechAUTHORS:HALpr50
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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 cm^2 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^-1/2] 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.
|Additional Information:||©1950 The American Physical Society. Received 15 September 1949. This work was assisted by the Joint Program of the ONR and the AEC.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||13 Jul 2006|
|Last Modified:||26 Dec 2012 08:56|
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