Atomic and nuclear properties of materials:
Liquid H--note density shift (H2) (H )
QuantityValueUnits ValueUnits
Atomic number 1     
Atomic mass 1.00794(7) g mole-1   
Density 0.0708 g cm-3   
Mean excitation energy 21.8 eV   
Minimum ionization 3.919 MeV g-1cm2 0.2774 MeV cm-1
Nuclear collision length 42.8 g cm-2 605.1 cm
Nuclear interaction length 52.0 g cm-2 734.6 cm
Pion collision length 70.4 g cm-2 994.4 cm
Pion interaction length 80.3 g cm-2 1134. cm
Radiation length 63.04 g cm-2 890.4 cm
Critical energy 273.84 MeV (for e-) 267.33 MeV (for e+)
Molière radius 4.88 g cm-2 68.95 cm
Plasma energy 7.64 eV   
Muon critical energy 3070. GeV   
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT
Explanation of some entries
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients