Neutron-triton cross sections and scattering lengths obtained from<i>p</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>He scattering

Abstract

An approximately Coulomb-corrected, charge-symmetric R-matrix prediction for n${\mathrm{\ensuremath{-}}}^{3}$H scattering from analyzing p${\mathrm{\ensuremath{-}}}^{3}$He data is described, which deviates at most by 2% from the n${\mathrm{\ensuremath{-}}}^{3}$H total cross section. The total cross section, together with a new measurement of the coherent scattering length now allows two possible sets of singlet and triplet scattering lengths ${\mathit{a}}_{\mathit{s}}$ and ${\mathit{a}}_{\mathit{t}}$. Our analysis agrees well with the new value of the coherent scattering length, and determines the set with ${\mathit{a}}_{\mathit{s}}$/${\mathit{a}}_{\mathit{t}}$&gt;1 to be the correct one.