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The cross section for the radiative capture of protons by C12 near 100 Kev

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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Abstract

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.


Item Type:Article
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.
Record Number:CaltechAUTHORS:HALpr50
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HALpr50
Alternative URL:http://dx.doi.org/10.1103/PhysRev.77.197
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3835
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jul 2006
Last Modified:26 Dec 2012 08:56

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