Atomic and nuclear properties of materials:
Gallium arsenide (GaAs)
QuantityValueUnits ValueUnits
<Z/A> 0.44247     
Density 5.31 g cm-3   
Mean excitation energy 384.9 eV   
Minimum ionization 1.368 MeV g-1cm2 7.262 MeV cm-1
Nuclear collision length 86.8 g cm-2 16.35 cm
Nuclear interaction length 142.8 g cm-2 26.90 cm
Pion collision length 111.8 g cm-2 21.06 cm
Pion interaction length 171.3 g cm-2 32.25 cm
Radiation length 12.19 g cm-2 2.296 cm
Critical energy 18.11 MeV (for e-) 17.53 MeV (for e+)
Molière radius 14.28 g cm-2 2.689 cm
Plasma energy 44.17 eV   
Muon critical energy 297. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
Ga
 31
1.00
0.482019
As
 33
1.00
0.517981
* calculated from mass fraction data.

Explanation of some entries
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