Nuclear gluon distributions in a parton model

Abstract Gluon distributions in carbon and tin nuclei are investigated by using a Q2 rescaling model with parton recombination effects. We obtain strong shadowings in the small x region due to the recombinations. The ratio G A (x) G N (x) in the medium x region is typically 0.9 for medium size nuclei. At large x, the ratio becomes large due to gluon fusions from different nucleons. Comparisons with recent New Muon Collaboration data for G Sn (x) G C (x) indicate that more accurate experimental data are needed for testing the model.