Investigation of the {sup 23}Na(p,{gamma}){sup 24}Mg and {sup 23}Na(p,{alpha}){sup 20}Ne reactions via ({sup 3}He,d) spectroscopy

States near the {sup 23}Na+p threshold in {sup 24}Mg were investigated using the {sup 23}Na({sup 3}He,d){sup 24}Mg reaction over the angular range of 5 deg. {<=}{theta}{sub lab}{<=}35 deg. at E({sup 3}He)=20 MeV. Spectroscopic factors were extracted for states corresponding to resonances in the {sup 23}Na(p,{gamma}){sup 24}Mg and {sup 23}Na(p,{alpha}){sup 20}Ne reactions. We find that one state, corresponding to a previously unobserved resonance at E{sub c.m.}=138 keV, may make a significant contribution to the rates of both reactions at low temperatures. Another state, corresponding to a possible resonance at E{sub c.m.}=37 keV may make a small contribution to the {sup 23}Na(p,{alpha}){sup 20}Ne reaction. New rates for the {sup 23}Na(p,{gamma}){sup 24}Mg and {sup 23}Na(p,{alpha}){sup 20}Ne reactions are presented and the astrophysical implications are discussed.