Radiative proton capture to low-lying T=0 and T=1 states in 10B

Cross sections of the radiative proton capture reaction Be-9( p,gamma), leading to the low-lying excited states in B-10 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 B-10 show a large difference.