From: adwasil@poczta.onet.pl
Date: Thu Apr 28 2005 - 13:44:57 CEST
I try to find a difference in neutron transport in vacuum and air. that While I'm using vacuum instead of air everything is OK, but wile I'm using fluka material 24 I obtain an error massage **** Low energy neutron xsec not found for some media 1 2 ****.
What am I doing wrong?
Best regards
Adam
file.inp:
TITLE
Electron to photon to neutron on tungsten
DEFAULTS PRECISIO
*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
BEAM -0.007 ELECTRON
BEAMPOS 0. 0. -30. 0. 0.
EVENTYPE 2. DPMJET
GEOBEGIN COMBINAT
geometry definition
SPH 1 0. 0. 0. +9000000.
RPP 2-1000000. +1000000. -1000000. +1000000. -1000000. +1000000.
SPH 3 0. 0. 0. +100.
RCC 4 0. 0. -3.5 0. 0. 7.
10.
RPP 5 -20. +20. -20. +20. +100.1 +100.2
END
* black hole region
1 5 +1 -2
* vacuum around (outer)
2 5 +2 -3 -5
* air around (inner)
3 5 +3 -4
* tungsten target region (7cm thick, 10cm radius)
4 5 +4
* forward detector region
5 5 +5
END
GEOEND
*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
* Z Mass Dens[g/cm3] Index Not.used Name
*MATERIAL 74. 184. 19.3 23. TUNGSTEN
*MATERIAL 4. 9.0122 1.848 5. BERYLLIU
*MATERIAL 7.2 14.4 0.00129 24. AIR*
*
*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
*
*ASSIGNMAT (material==>region)
* tungsten target
ASSIGNMAT 23. 4.
* forward detector region
ASSIGNMAT 24. 5.
* Outer vacuum
ASSIGNMAT 2. 2.
* Inner air
ASSIGNMAT 24. 3.
* External Black Hole
ASSIGNMAT 1. 1.
PHOTONUC 1. 0. 0. 4. 24. 1.
LAM-BIAS 0. 0.00005 0. 7.
*23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
*---o---- ----1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7----
*EMF EMF-OFF
* **** Scoring ****
USRBDX +1. 7. -31. 3. 2. PHOTON
USRBDX +0.02 300. 1. &
USRBDX +1. 3. -32. 3. 2. ELECTRON
USRBDX +0.02 300. 1. &
USRBDX +1. 8. -33. 3. 2. NEUTRON
USRBDX +0.02 +1.E-5 300. 1. &
*---o---- ----1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7----
USRBDX +1. 7. -41. 5. 2. PHOTON
USRBDX +0.02 300. 1. &
USRBDX +1. 3. -42. 5. 2. ELECTRON
USRBDX +0.02 300. 1. &
USRBDX +1. 8. -43. 5. 2. NEUTRON
USRBDX +0.02 +1.E-5 300. 1. &
RANDOMIZE 1.
*---o---- ----1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7----
START 50. 1.0
STOP
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