Recently a high-resolution proton recoil spectrometer was used to measure the neutron spectrum from 20-MeV proton bombardment of ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$. Evidence for levels in ${}_{}{}^9{}_{}{}^{}\mathrm{B}$ at 1.4- and 3.2-MeV excitation was presented. Using time-of-flight techniques, we have remeasured the neutron spectrum and find no evidence for these levels.

• Received 6 October 1969

DOI:https://doi.org/10.1103/PhysRevC.2.319