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- W2050342801 abstract "A low voltage accelerator and high current ion source has been used to determine the cross section of the reaction ${mathrm{C}}^{12}(pensuremath{gamma}){mathrm{N}}^{13}$ 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 ${mathrm{N}}^{13}$ 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 ${10}^{ensuremath{-}16}$ positron per proton and cross sections as low as ${10}^{ensuremath{-}10}$ barn or ${10}^{ensuremath{-}34}$ ${mathrm{cm}}^{2}$ can be measured with errors of the order of ifmmodepmelsetextpmfi{}20 percent. The cross section for the ${mathrm{C}}^{12}(pensuremath{gamma}){mathrm{N}}^{13}$ reaction has been found to fit the semi-empirical expression $ensuremath{sigma}=0.0024{E}^{ensuremath{-}1}mathrm{exp}[ensuremath{-}6{E}^{ensuremath{-}frac{1}{2}}]$ 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." @default.
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- W2050342801 date "1950-01-15" @default.
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- W2050342801 title "The Cross Section for the Radiative Capture of Protons by<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>C</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>near 100 Kev" @default.
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- W2050342801 doi "https://doi.org/10.1103/physrev.77.197" @default.
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