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In 1951 Freeman became Senior Scientific Officer at the Harwell Tandem Accelerator Group. She later led the group and received the Ernest Rutherford Medal and Prize in 1976 with Roger Blin-Stoyle, for their research of the beta-radioactivity of complex nuclei. She was the first woman to win the "Ernest Rutherford Medal and Prize". She received an honorary doctorate from Sydney University and fellowships from the Institute of Physics and the American Physical Society. She retired in 1978.