Elsevier

Nuclear Physics A

Volume 122, Issue 3, 30 December 1968, Pages 606-624
Nuclear Physics A

Cross sections for the 16O(γ, 2n), 19F(γ, 2pn), 27Al(γ, 2pn), 51V(γ, α) and 51V(γ, α3n) reactions to 300 MeV

https://doi.org/10.1016/0375-9474(68)90580-0Get rights and content

Abstract

Yield and cross section results have been obtained for some photonuclear reactions in 16O, 19F, 27Al and 51V targets by measuring the radioactivities of the product nuclei in samples that had been irradiated with bremsstrahlung in the 20–300 MeV energy range. The reactions studied were 16O(γ, 2n), 19F(γ, 2pn), 27Al(γ, 2pn), 51V(γ, α) and 51V(γ, α3n). The cross sections at energies above 150 MeV have been interpreted in terms of the contributions from various reaction mechanisms. The reactions in O, F and Al generally have important contributions from both quasi-deuteron and pion emission processes. In the 51V reactions, the additional pion reabsorption mechanism also makes important contributions. The reaction cross sections at energies below 150 MeV are used to determine the total cross sections for photon absorption at energies above the giant-resonance region and below 150 MeV. The resulting total cross sections are generally consistent with those determined from neutron-counting experiments.

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  • Cited by (18)

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      As mentioned before, in this work the integrated cross sections for the studied reactions were determined relative to that of the 27Al(γ,2pn)24Na monitor reaction. More recently, Vodin et al. (Vodin et al., 2021) provided a new cross-section data set for the 27Al((γ,2pn)24Na reaction in the energy range 35–95 MeV, which is consistent with the data set measured by Mayer et al. (1968). This agreement further strengthens our selection of the 27Al((γ,2pn)24Na reaction as the monitor reaction.

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    †††

    This work was partially supported by the U.S. Office of Naval Research under Contract Number NONR 1834

    Present address: Lawrence Radiation Laboratory, Livermore, California.

    ††

    Present address: Massachusetts Institute of Technology, Cambridge, Massachusetts.

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