Possible evidence of nonstatistical properties in the Cl35(n, p)S35 cross section

The Cl-35(n, p) and Cl-35(n, alpha) cross sections at incident neutron energies between 2.42 and 2.74 MeV were measured using the Berkeley High Flux Neutron Generator. The cross sections for Cl-35(n, p) were more than a factor of 3 to 5 less than all of the values in the neutron absorption data libraries, while the Cl-35(n, alpha) cross sections are in reasonable agreement with the data libraries. The measured energy-differential cross section is consistent with a single resonance with a width of 293(46) keV. This result suggests that, despite the high incident neutron energy, any attempt to model (n, x) cross sections in the vicinity of the N = Z = 20 shell gap requires a resolved resonance approach rather than a Hauser-Feshbach approach.