New data on the giant dipole resonance in $^{40}$Са

New data are presented on the partial decay channels for the giant dipole resonance (GDR) of $^{40}$Са. In all, information has been obtained on 33 partial photoreaction channels, of which 16 have not been observed before. In particular, information has been obtained on the reactions $(\gamma, 2p_{i})$, $(\gamma, \tau_{i})$, and $(\gamma, \alpha_{i})$. A study is made of the isospin purity of the GDR states. It is found that the mixing of $T=0$ states with $T=1$ ones in the region of the GDR maximum does not exceed 2-3%. The proportions of the semidirect components in the partial photonucleon cross sections have been determined and in the cross section for photoabsorption by $^{40}$Са (the value is 0.55 for the latter).