Value for alpha particle mass
type: ConstantValue
has unit: KiloGM
informative reference: http://physics.nist.gov/cuu/Constants/bibliography.html
relative standard uncertainty: 5.0e-8
standard uncertainty: 0.00000000000000000000000000000000033
standard uncertainty SN: 3.3E-34
value: 0.0000000000000000000000000066446562
value SN: 6.6446562E-27
website: http://physics.nist.gov/cgi-bin/cuu/Value#mid