[fluka-discuss]: Does the neutron cross section liberary contain photonuclear reactions?

From: <bosqw7_at_mail.ustc.edu.cn>
Date: Thu, 21 May 2020 21:59:14 +0800 (GMT+08:00)

Dear Fluka experts,


I want to get the photo-neutron yield in PbI2, induced by 5~15MeV gamma. As Iodine
 is not the pre-defined material, it was included in the low-energy neutron cross section liberary. Whether or not I just need to define Iodine in cards MATERIAL, COMPOUND and LOW-MAT so that I can simulate the photonuclear process of Iodine?


I write a .inp file(as follow and the attached file), and it can run without warning. But if I assign PbI2 (defined as material number 27) to the target material, no neutron data was contained in the output USRBDX file (all is zero). If the ASSIGNMA card just contains Pb(material number 17), neutron data can be put out correctly. What is the problem?
* --+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8

BEAM -1.0E-02 5.0E-03 PHOTON
BEAMPOS 0.0 0.0 0.0 1.0 0.0 0.0
PHOTONUC 1.0 0.0 0.0 17.0 26.0 9.0
LAM-BIAS 0.0 0.01 17.0 7.0 0.0 0.0
LAM-BIAS 0.0 0.01 26.0 7.0 0.0 0.0

* --+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
MATERIAL 53.0 0.0 1.32 26.0 0.0 0.0IODINE
MATERIAL 0.0 0.0 3.24 27.0 0.0 0.0LLFP
COMPOUND 2.0 17.0 1.0 26.0 0.0 0.0LLFP
LOW-MAT 26.0 53.0 127.0 296.0 0.0 0.0IODINE

* --+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
ASSIGNMA 17.0 TA1
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
EMFCUT -6.0E-3 6.0E-3 0.0 17.0 26.0 9.0PROD-CUT
* --+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
USRBDX 1. NEUTRON 59. TA1 VAC 1.0neu
USRBDX 1.00 0.0 100.0 6.2831 0.0 1.0&


PS:
Best Regards


Qi



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Received on Thu May 21 2020 - 18:36:26 CEST

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