Absolute cross sections for the ${\mathrm{Be}}^7(p,\gamma ){\mathrm{B}}^8$ reaction have been measured at 8 proton energies between 483 and 1932 keV. These measurements have been used to obtain a zero-energy intercept of the cross-section factor $S\left(E\right)\mathrm{}$ for this reaction, $S_0=0.043\mathrm{}\pm 0.004$ keV barn. A resonance was observed in the ${\mathrm{Be}}^7(p,\gamma ){\mathrm{B}}^8$ reaction, corresponding to the first excited state of ${\mathrm{B}}^8$, and a radiative width of 0.050±0.025 eV was obtained for this state.

• Received 9 June 1966

DOI:https://doi.org/10.1103/PhysRev.150.851