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- W2005124375 abstract "We have measured the cross section for neutron radiative capture by $^{7}mathrm{Li}$ at thermal neutron energy as 45.4ifmmodepmelsetextpmfi{}3.0 mb. We have compared this value, and the available fast-neutron-capture cross-section data on $^{7}mathrm{Li}$, with direct- and valence-capture theory. The mechanism of direct capture involving simple neutron-orbital transitions within a potential well can adequately account for the magnitude of the thermal-neutron-capture cross sections and the shape of the fast-neutron-capture cross sections. We recommend that the capture cross sections from the theoretical calculation, instead of those from a recent measurement, be used for nuclear astrophysics calculations. If the fast-neutron-capture data are normalized at 25 keV to the theoretical value, the magnetic-dipole (M1) radiation width of the 255-keV p-wave resonance can be deduced. It is in agreement with the value calculated from a valence theory for M1 capture, thus lending support for this neutron-capture mechanism as an important one, at least for light nuclei. We also find some evidence from our analysis of the total cross-section data for a possible energy dependence of the potential required to describe the almost pure single-particle s-wave resonances underlying the $^{7}mathrm{Li}$ cross section." @default.
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- W2005124375 date "1991-08-01" @default.
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- W2005124375 title "Direct and valence neutron capture byLi7" @default.
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- W2005124375 doi "https://doi.org/10.1103/physrevc.44.764" @default.
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