The first sample that Brickwedde sent was evaporated at at a pressure of . To their surprise, this showed no evidence of enrichment. Brickwedde then prepared a second sample evaporated at at a pressure of . On this sample, the Balmer lines for heavy hydrogen were seven times as intense. The paper announcing the discovery of heavy hydrogen, later named deuterium, was jointly published by Urey, Murphy, and Brickwedde in 1932. Urey was awarded the Nobel Prize in Chemistry in 1934 "for his discovery of heavy hydrogen". He declined to attend the ceremony in Stockholm, so that he could be present at the birth of his daughter Mary Alice.