  The reaction rates for alpha capture processes on self-conjugate nuclei in
the mass range A=20-40 have been investigated. The rates were calculated using
the statistical model code NON-SMOKER taking into account isospin suppression
rules. These theoretical predictions are compared with rates derived from the
available experimental data about the alpha capture reactions taking also into
account additional experimental information from different reaction channels
populating the alpha unbound states of the self-conjugate compound nuclei.
