CROSS-SECTIONS FOR THE CA-42(P,GAMMA)SC-43,CA-42(ALPHA,N)TI-45 AND CA-44(P,N)SC-44 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.