Total cross section and resonance spectroscopy for n+124Sn

The neutron total cross section of 124Sn has been measured over the energy range 0.014 endash 0.315 MeV. An 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 s1/2, p1/2, and p3/2 contributions. The s- and p-wave neutron strength functions have been determined (for a channel radius of 7.23 fm) to be 0.12±0.03 and 1.8±0.2, respectively (in units of 10-4). Limits are placed on the average level spacings and strength functions for the individual partial-wave components. The number of definite p1/2 levels exceeds the p3/2 levels by the factor 2 and their average strengths differ by the factor 4. s- and p-wave potential scattering radii have been determined to be 6.4±0.2 fm and 10.5±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 1996 The American Physical Society