Total cross section and resonance spectroscopy for n+124Sn.

Abstract

The neutron total cross section of {sup 124}Sn has been measured over the energy range 0.014{endash}0.315 MeV. An {ital R}-matrix analysis has been performed to obtain resonance and average parameters which provide for a complete representation of the neutron entrance channels for the {ital s}{sub 1/2}, {ital p}{sub 1/2}, and {ital p}{sub 3/2} contributions. The {ital s}- and {ital p}-wave neutron strength functions have been determined (for a channel radius of 7.23 fm) to be 0.12{plus_minus}0.03 and 1.8{plus_minus}0.2, respectively (in units of 10{sup {minus}4}). Limits are placed on the average level spacings and strength functions for the individual partial-wave components. The number of definite {ital p}{sub 1/2} levels exceeds the {ital p}{sub 3/2} levels by the factor 2 and their average strengths differ by the factor 4. {ital s}- and {ital p}-wave potential scattering radii have been determined to be 6.4{plus_minus}0.2 fm and 10.5{plus_minus}0.3 fm, respectively. Average scattering functions, deduced from the average parameters, have been used to determine the real well depth of an optical-model potential which reproduces these functions. There is evidence of an angular momentum dependence of the real-well potential depth and the level spacings. {copyright} {ital 1996 The American Physical Society.}