Neutron total cross-section measurements of 9Be, 1011B, and 1213C from 1.0 to 14 MeV using the 9Be(d,n)10B reaction as a white neutron source

High-resolution and high-accuracy total cross sections of 9Be, 1011B, and 1213C were measured from 1.0 to 14 MeV. The Los Alamos Scientific Laboratory Tandem Accelerator was used to produce a white source of neutrons by stopping a pulsed beam of 15-MeV deuterons in a thick beryllium target. The neutron energy resolution (full-width at half-maximum) achieved in kiloelectron volts is given by 1.4E(MeV)/sup 3/2/, and the accuracy of the neutron energy scale in kiloelectron volts is given by +- E(MeV)[0.00744E(MeV) + 0.01592]/sup 1/2/. The statistical uncertainties in the transmission vary from 0.5 to 2%, and the systematic error in the transmission is estimated to +- 1.7%. The cross sections are compared with those in the ENDF/B-IV library where appropriate. The high statistical accuracy of the 11B data, for example, has revealed fine structure at high excitation energy (around 9 MeV), which correlates with the structure observed in charged prticle measurements on the same compound nucleus. There are also indications of additional structures that have not been seen previously in the 12B compound nucleus at this excitation energy