Proton total reaction cross sections of carbon from 16 to 28 MeV

doi:10.1016/0029-5582(65)90654-1

Nuclear Physics

Volume 68, Issue 2, June 1965, Pages 378-386

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Abstract

Optical model analysis of the elastic scattering of 18 to 31 MeV protons from carbon has shown that fairly wide variations in the optical model parameters are necessary to reproduce the data. A later analysis of these data in which it was assumed that the scattering amplitude is described by the sum of optical model and Breit-Wigner terms has indicated possible resonances at 19.8, 20.01, and 24.9 MeV (c.m.). The later analysis predicts an inflection point in the proton total reaction cross section at about 21 MeV (lab). In this work the reaction cross sections were measured in the energy range 16 to 28 MeV using the anti-coincidence beam attenuation technique, and the energy variation was achieved with beryllium absorbers and subsequent magnetic analysis. The measured reaction cross section agrees well with the cross section predicted by the later analysis except that there is a weak maximum instead of an inflection point at about 21 MeV (lab).

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The percentage of protons undergoing nuclear inelastic interactions has been measured in a direct counting experiment, for protons with energies between 20 and 50 MeV incident on CsI, NE102 (plastic scintillator) and Stilbene, and for incident energies between 20 and 150 MeV on NaI. These values have been determined to about 3%, with smaller errors than this at the higher energies and larger errors than this at the low energies. New calculations of this quantity between 20 and 50 MeV have also made, using available reaction cross section information with uncertainties of about 5%. These calculations are compared with the experimental results and show excellent agreement. Other existing reaction percentage information is compared with the present experimental and calculational results and shows good agreement.
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The proton total reaction cross sections of ⁹Be are presented for eight energies between 16.2 and 28.0 MeV. The results are in good agreement with optical-model predictions from analyses of elastic scattering data. The results are also compared to predictions of the opaque-nucleus model which represents the reaction cross sections of medium and heavy weight nuclei rather well. This simple model correctly predicts the observed energy dependence, but requires a larger radius parameter than is needed for the heavier nuclei.

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^†: This work was supported in part by the U.S. Atomic Energy Commission.

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Nuclear Physics

Abstract

References (22)

Phys. Lett.

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Phys. Lett.

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Phys. Rev.

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Proton loss by nuclear inelastic interactions in CsI, NaI, NE102, NE213 and stilbene

Study of the <sup>13</sup>C and the <sup>13</sup>N ground states by a dispersion analysis of p+<sup>12</sup>C scattering

The elastic and inelastic scattering of 30.5 MeV protons by<sup>24</sup>Mg

Proton total reaction cross sections of Beryllium from 16 to 28 MeV