[fluka-discuss]: Problem with biasing

From: babintsev <babintsev_at_ihep.ru>
Date: Mon, 29 Jul 2019 08:46:55 +0300

  Dear experts,
  I want to enlarge neutron statistics  on the right side
  of the target with the same number of beams:
       lead box in moderator ... and 3 counters on the right side

  For this I use biasing : divide moderator into 2 parts : left and right
  I use W= 2 to the right  side
         = 1/2 for the left side in moderator

  Then I compare results before biasing and after that.

  Results :
    () Total number of low energy neutron interactions: 6025716
                  with biasing

                   ... it was                            3525982
                                                      no biasing

    () CPU  - approximately the same

    () N neutrons in the counters is less with biasing !?

       example with counter-3 (C3) :
                     1.5200707E-02  +/-   2.631857     % (no biasing)

                     1.3233015E-02  +/-   9.833910     %  with biasing

               ------------------------

  so, I think that these are strange results

  May be I have errors somewhere ?

  thank you
  Vladimir




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Received on Mon Jul 29 2019 - 09:21:21 CEST

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