How to set S(α,β) parameter of Low-pwxs?

For some istopes in special materials like polytene, graphite, water and so on, there are special S(α,β) data, how to select the data through S(α,β) parameter of Low-pwxs?

HI @Newconcept_1979

thank you for reporting. There is a bug in flair and it doesn’t automatically detect the S(a,b) materials from the database.
Until the flair fix which will be available quite soon, for the moment

Please look the folder
{FlukaDir}/data/neutron/JEFF-3.3/ThermalScattering/Inelastic/CrossSection
where {FlukaDir} is your fluka installation directory.
You should see a list of files each one corresponding for an isotope in a material

al_metal
be_beo
be_metal
benzen
d_heavy_water
d_ortho_d2
d_para_d2
fe_metal
graphite
h_l_ch4
h_ortho_h2
h_para_h2
h_polyethylene
h_s_ch4
h_water
h_zrh
o_beo
o_uo2
u_uo2
zr_zrh

To enter the information in flair,
you can press Ctrl-E on the LOW-PWXS card and type-in the material you want in the WHAT(2) field

like the example above. I am selecting the h_water to be linked with the WATER material but only for the H-1, Z=1, A=1 isotope IAZ=10010

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@ Vasilis Vlachoudisvasilis, thanks!