atlas logo.gif (621 bytes) 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 -3

Vanadium absorption cross-section at neutron wavelength of 1.8 is 5.08 barns

Standard vanadium cross-section 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=0.98580.0065cm, 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

Titanium-Zirconium null alloy, Ti.Zr

Ti.Zr density=5.2777 g cm-3 = 0.051622 atoms -3

Ti.Zr absorption cross-section at neutron wavelength of 1.8 is 4.232 barns

Standard Ti.Zr cross-section 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, SiO2

SiO2 density= 0.066378 atoms -3  

SiO2 absorption cross-section at neutron wavelength of 1.8 is 0.0572 barns

Standard SiO2 cross-section file: g_f:sio2.mut

(A list of standard .MUT cross-section files is available here.)


Last updated on 04 Mar 2008 by Alex Hannon (a.c.hannon@rl.ac.uk)