Cross sections for the ⁴²Ca(p,γ)⁴³Sc, ⁴²Ca(α,n)⁴⁵Ti and ⁴⁴Ca(p,n)⁴⁴Sc reactions

Cross sections of the ⁴²Ca(p, gamma )⁴³Sc, ⁴²Ca( alpha ,n)⁴⁵Ti and ⁴⁴Ca(p,n)⁴⁴Sc reactions have been measured by detection of 0.511 MeV gamma rays in coincidence from positron decay of the product nuclei. The ⁴⁴Ca(p,n) cross section is a factor three larger than a previous measurement. The magnitude of the ⁴²Ca(p, gamma ) cross section above E=4.5 MeV is very sensitive to the magnitude of the ⁴⁴Ca(p,n) cross section due to a 0.56%⁴⁴Ca component in the ⁴²Ca targets, since ⁴⁴Sc and ⁴³Sc have virtually the same half-life. Reasonable values for the (p, gamma ) cross section are obtained using the present (p,n) cross section measurement. The ⁴²Ca( alpha ,n)⁴⁵Ti cross section has not been reported previously. All cross sections are compared with a statistical model calculation.