Atomic and nuclear properties of hafnium (Hf)
QuantityValueUnits ValueUnits
Atomic number 72     
Atomic mass 178.49(2) g mol-1   
Density 13.31 g cm-3   
Mean excitation energy 705.0 eV   
Minimum ionization 1.152 MeV g-1cm2 15.33 MeV cm-1
Nuclear interaction length 190.1 g cm-2 14.28 cm
Nuclear collision length 109.5 g cm-2 8.226 cm
Pion interaction length 216.6 g cm-2 16.28 cm
Pion collision length 133.0 g cm-2 9.995 cm
Radiation length 6.89 g cm-2 0.5177 cm
Critical energy 8.22 MeV (for e-) 7.93 MeV (for e+)
Muon critical energy 155. GeV   
Molière radius 17.77 g cm-2 1.335 cm
Plasma energy ωp 66.77 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