RELATIVE DIELECTRON YIELDS IN P-4.9 GEV(P AND P+D INTERACTIONS FROM E(BEAM) = 1.0)

The beam energy and invariant mass dependence of the dielectron yield in p + d interactions relative to the yield in p + p interactions is p resented for incident kinetic energies from 1.0-4.9 GeV. The ratio of the yield in p + d interactions to that in p + p interactions decrease s from 10.5 +/- 1.6 at 1.0 GeV to 1.96 +/- 0.08 at 4.9 GeV for electro n pairs with invariant masses greater-than-or-equal-to 0.15 GeV/c2. Th e large ratio at 1.0 GeV suggests that dielectron production in the p + d system is dominated by a p + n process. The beam energy dependence of the ratio indicates that this p + n contribution decreases with re spect to the other dielectron sources as the incident energy is increa sed.