Atomic and nuclear properties of americium (Am)
QuantityValueUnits ValueUnits
Atomic number 95     
Atomic mass [243.06138(2)] g mol-1   
Density 13.67 g cm-3   
Mean excitation energy 934.0 eV   
Minimum ionization 1.089 MeV g-1cm2 14.88 MeV cm-1
Nuclear interaction length 210.5 g cm-2 15.40 cm
Nuclear collision length 119.3 g cm-2 8.727 cm
Pion interaction length 236.3 g cm-2 17.29 cm
Pion collision length 142.2 g cm-2 10.40 cm
Radiation length 5.80 g cm-2 0.4243 cm
Critical energy 6.50 MeV (for e-) 6.25 MeV (for e+)
Muon critical energy 127. GeV   
Molière radius 18.93 g cm-2 1.385 cm
Plasma energy ωp 66.61 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
Note: Since there is no stable isotope, [atomic mass] is that of the longest-lived isotope known as of Jun 2017.
Table of isotopes via WIKIPEDIA