BERKELEY – Owen Chamberlain, who shared the Nobel Prize in physics as co-discoverer of the antiproton, has died at age 85. Chamberlain, a professor emeritus of physics at the University of California, Berkeley, died Tuesday at his Berkeley home from complications of Parkinson's disease, campus officials said Wednesday. Chamberlain and Berkeley physicist Emilio Segre shared the Nobel Prize in 1959 for discovering the antiproton, which is the opposite counterpart to the positively charged proton. “The discovery opened up a whole new field of physics and expanded our understanding of particle physics,” Chamberlain's colleague and former student Herbert Steiner, a professor...