NEUTRON TOTAL CROSS-SECTION MEASUREMENTS OF BE-9, B-10,11, AND C-12,13 FROM 1.0 TO 14 MEV USING THE BE-9(D,N)B-10 REACTION AS A WHITE NEUTRON SOURCE

High-resolution and high-accuracy total cross sections of **9Be, **1**0**,**1**1B, and **1**2**,**1**3C have been 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)**3**/**2, and the accuracy of the neutron energy scale in kiloelectron volts is given by plus or minus E(MeV) left bracket 0. 00744E(MeV) plus 0. 01592 right bracket ** one-half . The statistical uncertainties in the transmission vary from 0. 5 to 2%, and the systematic error in the transmission is estimated to plus or minus 1. 7%. The cross sections are compared with those in the ENDF/B-IV library where appropriate. The high statistical accuracy of the **1**1B data, for example, has revealed fine structure at high excitation energy (around 9 MeV), which correlates with the structure observed in charged particle measurements on the same compound nucleus. There are also indications of additional structures that have not been seen previously in the **1**2B compound nucleus at this excitation energy.