Atomic and nuclear properties of barium (Ba)
QuantityValueUnits ValueUnits
Atomic number 56     
Atomic mass 137.327(7) g mol-1   
Density 3.500 g cm-3   
Mean excitation energy 491.0 eV   
Minimum ionization 1.231 MeV g-1cm2 4.307 MeV cm-1
Nuclear interaction length 174.6 g cm-2 49.89 cm
Nuclear collision length 102.0 g cm-2 29.16 cm
Pion interaction length 201.7 g cm-2 57.63 cm
Pion collision length 126.1 g cm-2 36.02 cm
Radiation length 8.31 g cm-2 2.373 cm
Critical energy 10.98 MeV (for e-) 10.62 MeV (for e+)
Muon critical energy 194. GeV   
Molière radius 16.04 g cm-2 4.583 cm
Plasma energy ωp 34.43 eV   
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries
Table of isotopes via WIKIPEDIA
x ray mass attenuation coefficients from NIST