Total cross section and resonance spectroscopy forn+86Kr

The neutron total cross section for n+ ${}_{}{}^{86}{}_{}{}^{}$Kr has been measured over the incident neutron energy range 0.015 to 25 MeV. The average total cross section is obtained for neutron energies from 1 to 25 MeV. For the energy region from 0.015 to 1 MeV, an R-matrix analysis yields resonance parameters which provide a complete representation of the neutron scattering functions for the $s_{1/2}$, $p_{1/2}$, and $p_{3/2}$ scattering channels. From this analysis level densities, neutron strength functions, and external R functions are obtained for the 1-MeV energy region just above the neutron separation energy. The backshifted Fermi-gas model provides excellent descriptions of the level densities for the ${(1/2\mathrm{}}^{+}$, ${(1/2\mathrm{}}^{\mathrm{-}}$, and ${(3/2\mathrm{}}^{\mathrm{-}}$ states. Evidence of intermediate structure is found for the s-, p-, and d-wave scattering channels.