Cross sections of the radiative proton capture reaction ${}^9\mathrm{Be}(p,\gamma )$, leading to the low-lying excited states in ${}^{10}\mathrm{B}$ with isospin $T=0$ and 1, have been measured over the proton energy range of 7 to 20 MeV. For this, the method of coincidence between the primary and the secondary $\gamma$ rays has been used. These $\gamma$ rays are emitted following, respectively, the proton capture to an excited state and the subsequent decay of that state. A direct-semidirect capture model calculation has been performed and compared with the experimental data. The experimental results do not show a strong isospin dependence of the GDR strength function built on the low-lying states. The derived photoproton cross sections on these states and the earlier-measured photoneutron cross sections on the ground state of ${}^{10}\mathrm{B}$ show a large difference.

• Received 19 November 2016

DOI:https://doi.org/10.1103/PhysRevC.95.014614