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- W2007056208 abstract "We have used a 100-MeV electron linac and neutron time-of-flight facility to measure precise neutron total cross sections in the mass-140 region for incident neutron energies of 3-60 MeV. We measured the absolute neutron total cross section of $^{140}mathrm{Ce}$ and the total cross section differences of $^{139}mathrm{La}$-$^{140}mathrm{Ce}$, $^{141}mathrm{Pr}$-$^{140}mathrm{Ce}$, and $^{142}mathrm{Ce}$-$^{140}mathrm{Ce}$. These cross section differences oscillate with energy. Optical model calculations have been performed which fit the $^{140}mathrm{Ce}$ total cross section well over the 3-60 MeV energy region. The $^{139}mathrm{La}$-$^{140}mathrm{Ce}$ and $^{141}mathrm{Pr}$-$^{140}mathrm{Ce}$ difference data were satisfactorily fit by small changes in the geometrical parameters of the potential. The $^{142}mathrm{Ce}$-$^{140}mathrm{Ce}$ data could not be fit by small changes in the geometry of the potential and we found that the changes required to achieve a satisfactory fit suggest that $^{142}mathrm{Ce}$ is either nonspherical or more easily deformed than $^{140}mathrm{Ce}$. Using our final optical model parameters we calculated $ensuremath{delta}({r}^{2})=^{A}〈{r}^{2}〉ensuremath{-}^{140}〈{r}^{2}〉$ for the real part of the potential. The $^{139}mathrm{La}$-$^{140}mathrm{Ce}$ and $^{141}mathrm{Pr}$-$^{140}mathrm{Ce}$ optical model values of $ensuremath{delta}({r}^{2})$ were in agreement with corresponding $ensuremath{delta}{({r}^{2})}_{q}$ values calculated using muonic x-ray data. The value for $^{142}mathrm{Ce}$-$^{140}mathrm{Ce}$ was not." @default.
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- W2007056208 date "1984-06-01" @default.
- W2007056208 modified "2023-09-25" @default.
- W2007056208 title "Neutron absolute and total cross section difference measurements in the mass-140 region" @default.
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- W2007056208 doi "https://doi.org/10.1103/physrevc.29.2106" @default.
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