Re: another low energy neutron xsec case

From: Sébastien WURTH (wurth@ipno.in2p3.fr)
Date: Mon Sep 12 2005 - 10:05:14 CEST

  • Next message: Alberto Fasso': "Re: another low energy neutron xsec case"

    Reddell, Brandon D a écrit :

    >Dear FLUKA users,
    >
    >I am getting the following familiar error message that has been posted before:
    >
    > **** Low energy neutron xsec not found for some media 3 5 ****
    >
    >However, I can not determine what the problem is. Below are my material and assignment statements. Could somebody tell me what I am doing wrong?
    >
    >Sincerely,
    >
    >Brandon Reddell
    >
    >*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    >*MATERIAL 13.0 27.000 2.70 10.0 ALUMINUM
    >*LOW-MAT 13.0 13.0 -2.0 293.0
    >*MATERIAL 14.0 28.100 2.329 13.0 SILICON
    >*
    >*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    >MATERIAL 7.0 14.067 0.001251 7.0 NITROGEN
    >LOW-MAT 7.0 7.0 -2.0 293. NITROGEN
    >MATERIAL 8.0 15.999 0.001429 8.0 OXYGEN
    >LOW-MAT 8.0 8.0 -2.0 293. OXYGEN
    >MATERIAL 1.0 1.0079 8.988E-5 3.0 HYDROGEN
    >LOW-MAT 3.0 3.0 -2.0 293.0 HYDROGEN
    >* Argon material n. 18, normal temperature, overrides default mat. 18
    >MATERIAL 18.0 39.948 1.400 18.0 ARGON
    >LOW-MAT 18.0 18.0 -2.0 293.0 ARGON
    >* Air (mat. 24): 3 components, N (mat. 7), O (mat. 8), gaseous Ar (mat. 18)
    >MATERIAL 0.001225 26.0 AIR
    >COMPOUND -.9256E-03 7.0 -.2837E-03 8.0 -.01572E-3 18.0 AIR
    >* Water (mat. 20): H (material 3) and O (material 8)
    >MATERIAL 1.00 27.0 WATER
    >COMPOUND 2.0 3.0 1.0 8.0 WATER
    >*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    >* Aluminum
    >ASSIGNMAT 10.0 3.0
    >* External Black Hole
    >ASSIGNMAT 1.0 1.0
    >* Vacuum
    >ASSIGNMAT 2.0 2.0
    >* Air
    >ASSIGNMAT 26.0 4.0
    >* Water
    >ASSIGNMAT 27.0 5.0
    >ASSIGNMAT 27.0 6.0
    >LOW-NEUT 0.0
    >EMF EMF-OFF
    >*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    >
    >
    >
    Hello Brandon,

    Did you see the webcourse section on fluka's website ? It explains some
    error messages and in particular those with your message.
    Please follow that link :
    http://www.fluka.org/course/WebCourse/crash/P012.html
    Did you check the data you gave in Low-mat ? Do you really need Low-mat
    for your problem ?
    And I saw one other thing : you have commented off the ALUMINUM and
    SILICON card (first lines of your material section), but in the
    assignment section, you use ALUMINUM ... your aluminum is the default
    one (pre-defined material number 10 in FLUKA) in this case, do you
    really want this ?

    I hope it helps.

    Sébastien

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