Atomic and nuclear properties of materials:
Status of ultraheavies as of March 2010 (pdf)
QuantityValueUnits ValueUnits
Atomic number 118     
Atomic mass [294.215(8)] g mole-1   
Specific gravity (20° C, 1 atm) 1.20E-02 g cm-3   
Mean excitation energy 1242.0 eV   
Minimum ionization 1.092 MeV g-1cm2 1.311E-02 MeV cm-1
Nuclear collision length 126.0 g cm-2 1.050E+04 cm
Nuclear interaction length 224.3 g cm-2 1.870E+04 cm
Pion collision length 148.5 g cm-2 1.237E+04 cm
Pion interaction length 250.1 g cm-2 2.084E+04 cm
Radiation length 4.88 g cm-2 406.9 cm
Critical energy 5.67 MeV (for e-) 5.45 MeV (for e+)
Molière radius 18.26 g cm-2 1521. cm
Plasma energy 2.00 eV   
Muon critical energy 131. 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
Note: Atomic mass is that reported by the researchers as of Jan 2007.
Note: Density is for an ideal monotomic gas.
Note: Ieff = 1242 eV assumed in calculating critical energies and dE/dx.