Energy Levels ofB10

The neutron spectrum at 0° and at 80° from the ${\mathrm{Be}}^9\mathrm{}(d,n)\mathrm{}{\mathrm{B}}^{10}$ reaction has been investigated by means of nuclear emulsions. Energy levels of ${\mathrm{B}}^{10}$ at 0.77, 1.79, 2.22, 3.59, 4.79, 5.12, 5.91, 6.11, 6.57, and 6.81 Mev have been observed as have possible levels at 5.58, 5.68, and 6.38 Mev. There is evidence for multiplicities at 5.12 and, possibly, at 6.11 Mev. No neutron groups were observed which would correspond to levels at 1.4 and 2.85 Mev. This result is in disagreement with the picture of equally spaced levels in ${\mathrm{B}}^{10}$. An attempt is made to explain the results that led to this picture.