Cross sections for (n, xn) reactions between 7.5 and 28 MeV

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Abstract

A total of 236 cross sections for ($n, \mathrm{xn}$) reactions have been measured at neutron energies between 7.5 and 28 MeV, using radiochemical techniques. Cross sections for ($n, {n}^{\ensuremath{'}}$) and ($n, 2n$) reactions are reported on $^{193}\mathrm{Ir}$; ($n, 2n$) cross sections on $^{45}\mathrm{Sc}$ and $^{58}\mathrm{Ni}$; ($n, 2n$) and ($n, 3n$) cross sections on $^{89}\mathrm{Y}$, $^{90}\mathrm{Zr}$, and $^{107}\mathrm{Ag}$; ($n, 2n$), ($n, 3n$), and ($n, 4n$) cross sections on $^{169}\mathrm{Tm}$, $^{175}\mathrm{Lu}$, $^{191}\mathrm{Ir}$, $^{197}\mathrm{Au}$, and $^{203}\mathrm{Tl}$; ($n, 3n$) and ($n, 4n$) cross sections on $^{151}\mathrm{Eu}$; and ($n, 4n$) cross sections on $^{205}\mathrm{Tl}$. Neutron fluences were determined by either the $^{27}\mathrm{Al}(n, \ensuremath{\alpha})^{24}\mathrm{Na}$ or the $^{90}\mathrm{Zr}(n, 2n)^{89}\mathrm{Zr}$ reactions appropriately combined with proton-recoil telescope measurements. The excitation functions are compared with calculations based on a model incorporating both compound-nucleus and preequilibrium decay modes. Cross sections for the $^{27}\mathrm{Al}(n, \ensuremath{\alpha})^{24}\mathrm{Na}$ reaction between 21 and 26 MeV are also reported.NUCLEAR REACTIONS $^{27}\mathrm{Al}(n, \ensuremath{\alpha})$, $E=21.4\ensuremath{-}4\ensuremath{-}26.0$ MeV; $^{45}\mathrm{Sc}(n, 2n)$, $E=14.1\ensuremath{-}28.1$ MeV; $^{58}\mathrm{Ni}(n, 2n)$, $E=16.2\ensuremath{-}28.1$ MeV; $^{89}\mathrm{Y}(n, 2n)$, ($n, 3n$), $E=14.1\ensuremath{-}28.1$ MeV; $^{107}\mathrm{Ag}(n, 2n)$, ($n, 3n$), $E=13.4\ensuremath{-}28.1$ MeV; $^{151}\mathrm{Eu}(n, 3n)$, ($n, 4n$) $E=14.8\ensuremath{-}28.0$ MeV; $^{169}\mathrm{Tm}(n, 2n)$, ($n, 3n$), ($n, 4n$), $E=8.6\ensuremath{-}28.0$ MeV; $^{191}\mathrm{Ir}(n, 2n)$, $E=8.6\ensuremath{-}24.5$ MeV; $^{191}\mathrm{Ir}(n, 3n)$, ($n, 4n$), $E=16.2\ensuremath{-}28.0$ MeV; $^{193}\mathrm{Ir}(n, n)$, $E=7.6\ensuremath{-}14.7$ MeV; $^{193}\mathrm{Ir}(n, 2n)$, $E=8.6\ensuremath{-}21.2$ MeV; $^{197}\mathrm{Au}(n, 2n)$, ($n, 3n$), ($n, 4n$), $E=8.6\ensuremath{-}28.1$ MeV; $^{203}\mathrm{Ti}(n, 2n)$, ($n, 3n$), ($n, 4n$), $E=8.6\ensuremath{-}28.0$ MeV; $^{205}\mathrm{Tl}(n, 4n)$, $E=23.3\ensuremath{-}28.0$ MeV; $\mathrm{Zr}(n, xn)$, $E=14.1\ensuremath{-}28.1$ MeV; $\mathrm{Lu}(n, xn)$, $E=8.5\ensuremath{-}28.0$ MeV; measured $\ensuremath{\sigma}(E)$. Estimated $^{90}\mathrm{Zr}(n, 2n)$, ($n, 3n$), $^{175}\mathrm{Lu}(n, 2n)$, ($n, 3n$), ($n, 4n$), $\ensuremath{\sigma}(E)$. Comparison with combined statistical and preequilibrium model.RADIOACTIVITY $^{189,190}\mathrm{Ir}$, $^{193}\mathrm{Ir}^{m}$; measured ${T}_{\frac{1}{2}}$.

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