The Pickup Reactions<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mn>10</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>d</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>for 14-Mev Neutrons

Measurements have been made of the yields and angular distributions of deuterons resulting from the bombardment of ${\mathrm{B}}^{10}$ by 14-Mev neutrons. The spectrum of charged reaction products was measured by means of a coincidence-telescope spectrometer consisting of two proportional counters and a thin NaI scintillator. The telescope was rotated to obtain measurements at various angles. Deuterons corresponding to the ground state and 2.43-Mev excited state of ${\mathrm{Be}}^{9}$ were identified by measurements of both their energy and $\frac{\mathrm{dE}}{\mathrm{dx}}$ values. The ground-state angular distribution was found to match the expected Butler inverse-stripping curve for ${l}_{p}=1$. The Butler analysis for the excited-state deuterons also gave ${l}_{p}=1$, corresponding to odd parity and spin $\frac{3}{2}$, $\frac{5}{2}$, $\frac{7}{2}$, or $\frac{9}{2}$ for the first excited state of ${\mathrm{Be}}^{9}$. In particular, the spin value 1/2, to be expected from the $L\ensuremath{-}S$ coupling model, is excluded. The cross sections, integrated from zero to 90 degrees (center of mass), are 21\ifmmode\pm\else\textpm\fi{}3 and 16\ifmmode\pm\else\textpm\fi{}2 millibarns, respectively, for the ground- and excited-state reactions.