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- W3110969642 abstract "Nearly monochromatic photons from positron annihilation in flight have been used to measure photoneutron cross sections for $^{23}mathrm{Na}$ and $^{25}mathrm{Mg}$ in the giant-resonance region. The shape of the giant resonance of each of these nuclei is rather broad, with less striking intermediate structure than in most neighboring $mathrm{sd}$-shell nuclei. In $^{23}mathrm{Na}$ the total cross section rises to approximately 10 mb at 17.5 MeV and remains essentially constant up to 25 MeV. In $^{25}mathrm{Mg}$ the total cross section reaches a peak of 28 mb at 23.1 MeV and falls to approximately half that magnitude at the upper energy limit of the experiment (29 MeV). In both nuclei the ($ensuremath{gamma},2n$) cross section appears to rise slowly above threshold but does not exceed 1 mb within the energy limits of the experiment. The integrated cross sections for $^{23}mathrm{Na}$ and $^{25}mathrm{Mg}$ are 119 and 249 MeV mb, respectively; the bremsstrahlung-weighted integrated cross sections are 5.7 mb for $^{23}mathrm{Na}$ and 11.7 mb for $^{25}mathrm{Mg}$." @default.
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- W3110969642 date "1971-11-01" @default.
- W3110969642 modified "2023-09-26" @default.
- W3110969642 title "Photoneutron Cross Sections forNa23andMg25" @default.
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- W3110969642 doi "https://doi.org/10.1103/physrevc.4.1673" @default.
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