Atomic and nuclear properties of materials:
Silicon (Si)
QuantityValueUnits ValueUnits
Atomic number 14     
Atomic mass 28.0855(3) g mole-1   
Density 2.33 g cm-3   
Mean excitation energy 173.0 eV   
Minimum ionization 1.664 MeV g-1cm2 3.876 MeV cm-1
Nuclear collision length 70.2 g cm-2 30.16 cm
Nuclear interaction length 108.4 g cm-2 46.52 cm
Pion collision length 96.2 g cm-2 41.29 cm
Pion interaction length 137.7 g cm-2 59.14 cm
Radiation length 21.82 g cm-2 9.370 cm
Critical energy 40.19 MeV (for e-) 39.05 MeV (for e+)
Molière radius 11.51 g cm-2 4.944 cm
Plasma energy 31.05 eV   
Muon critical energy 582. GeV   
Melting point 1687. K 1414. C
Boiling point @ 1 atm 3538. K 3265. C
Index of refraction (@ STP, Na D) 3.95     
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
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients