Neptunium-gamma
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 873 K
      Body centered cubic, bcc, structure
      _database_code_amcsd 0011225

      CELL PARAMETERS:    3.5200   3.5200   3.5200   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     43.614
      Density (g/cm3):     18.044
      MAX. ABS. INTENSITY / VOLUME**2:      2464.675557    
      RIR:     44.476
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.09        100.00        2.4890    1   1   0        12
                51.96         16.09        1.7600    2   0   0         6
                64.89         29.88        1.4370    2   1   1        24
                76.55          8.47        1.2445    2   2   0        12
                87.67         11.24        1.1131    3   1   0        24
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.