Atomic and nuclear properties of europium (Eu)
QuantityValueUnits ValueUnits
Atomic number 63     
Atomic mass 151.964(1) g mole-1   
Specific gravity 5.244 g cm-3   
Mean excitation energy 580.0 eV   
Minimum ionization 1.219 MeV g-1cm2 6.390 MeV cm-1
Nuclear collision length 104.8 g cm-2 19.99 cm
Nuclear interaction length 180.4 g cm-2 34.40 cm
Pion collision length 128.7 g cm-2 24.54 cm
Pion interaction length 207.5 g cm-2 39.57 cm
Radiation length 7.44 g cm-2 1.418 cm
Critical energy 9.59 MeV (for e-) 9.26 MeV (for e+)
Molière radius 16.44 g cm-2 3.135 cm
Plasma energy ωp 42.49 eV   
Muon critical energy 175. GeV   
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