Common Numerical Values for use with ATLAS
Standard Beam Sizes
GEM  2.0cm wide x 4.0cm high,
rectangular (other values are often used) 
SLS  3.2cm diameter, circular. 
LAD  1.5cm wide x 4.0cm high,
rectangular (other values were often used) 
Vanadium
Vanadium density=6.1039 g cm^{3} = 0.072160 atoms Å^{3}
Vanadium absorption crosssection at neutron wavelength of 1.8Å is 5.08 barns
Standard vanadium crosssection file: g_f:van.mut
'6mm' vanadium rod  diameter=0.6007cm, radius=0.30035cm 
'8mm' vanadium rod  diameter=0.8340cm, radius=0.4170cm 
'10mm' vanadium rod  diameter=0.9858±0.0065cm, radius=0.4929cm (there is considerable variation in this rod's diameter) 
inner radius 
outer radius 
total height 

'6mm' drawn vanadium cans 
0.2985cm 
0.3175cm 
~4.6cm 
'8mm' drawn vanadium cans 
0.381cm 
0.394cm 
6.350cm 
'11mm' drawn vanadium cans 
0.541cm 
0.557cm 
 
'15mm' drawn vanadium cans 
0.775cm 
0.790cm 
7.55cm 
'8mm' Harwell vanadium cans 
0.4cm 
0.4065cm 
5.145cm 
'5mm' thin vanadium foil cans 
0.25cm 
0.2525cm 
6.5cm 
'8mm' thin vanadium foil cans 
0.40cm 
0.4025cm 
8cm 
'8.3mm' thin vanadium foil cans 
0.415cm  0.4175cm  8cm 
TitaniumZirconium null alloy, Ti.Zr
Ti.Zr density=5.2777 g cm^{3} = 0.051622 atoms Å^{3}
Ti.Zr absorption crosssection at neutron wavelength of 1.8Å is 4.232 barns
Standard Ti.Zr crosssection file: g_f:tizr.mut
'8mm' cans with stopper: inner radius=0.402cm, outer radius=0.435cm. Internal volume of can is a cylinder of height 6.3cm with a conical section at the bottom of height ~ 0.275cm.
Silica Glass, SiO_{2}
SiO_{2} density= 0.066378 atoms Å^{3}
SiO_{2} absorption crosssection at neutron wavelength of 1.8Å is 0.0572 barns
Standard SiO_{2} crosssection file: g_f:sio2.mut
(A list of standard .MUT crosssection files is available here.)
Last updated on 04 Mar 2008 by Alex Hannon (a.c.hannon@rl.ac.uk)