In the wake of Chris Heisey’s significant biceps injury, the Washington Nationals added more potential bench help Friday when they acquired outfielder Ryan Raburn from the White Sox organization in exchange for a player to be named later or cash considerations, according to a person familiar with the situation. Raburn, 36, had been hitting .253 for the Class AAA Charlotte Knights with a .417 on-base percentage. He will report to Class AAA Syracuse, where he can be called upon to bolster the Nationals bench at any time, should they decide they need to add to what is a depleted stock of right-handed hitters. Raburn is a .253 career hitter in parts of 11 major league seasons, and played in 113 games for the Rockies last season. Most importantly for the Nationals’ purposes, Raburn has an .835 OPS against left-handed pitching.