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The vacancy formation energy of fcc 4He at 10.4 cm3 /mol was obtained by two different methods. In addition, c/a ratios were determined to be ideal for hcp 4He and hcp 3He near 10 cm3/mol.","abstract_has_math":false,"creators":["Shah, Raj Suresh"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Ralph O. 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