Dear Guanying Zhu,
indeed the discrepancy is due to a physics improvement, see
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/7275.html
in particular:
When treating anti-nucleon annihilation, *negative pion* and negative
muon absorptions on mixtures, the evaluation of the relative
probability of annihilation/capture on different target
components has been switched from a naïve “Z law” to more sound
approaches (following a suggestion by N. Bassler)
Kind regards
Francesco
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Zhu, Guanying [zhu.1475_at_buckeyemail.osu.edu]
Sent: 24 October 2016 17:32
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: 1MeV pions energy loss in water - branching ratio discrepancy in two versions of FLUKA
Dear fluka users,
I’m studying negative pions (kinetic energy = 1.0 MeV) energy loss in water.
My fluka version is FLUKA 2011 2c.3.
And I got the branching ratio of pions interacting with proton was 0.5%, and the ratio of interacting with oxygen was 99.5%.
I used mgdraw.f to record the interactions.
IF (MREG .EQ. 3. .AND. JTRACK .EQ. 14 ) THEN
do ip = 1, NP
WRITE(82, *) NCASE, JTRACK, ICODE, PTRACK, IBTAR, ICHTAR,
& IBRES, ICRES, NPHEAV, ip, KPART(ip), NP, TKI(ip)
end do
END IF
Please find attached the related files.
However, according to the result from an early run with FLUKA 2011 2b.5, the ratio of pions interacting with proton was 20.5%, and with oxygen was 79.5%.
Does anyone know if the discrepancy is due to fluka update?
Thanks!
Guanying Zhu
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Received on Mon Oct 24 2016 - 20:15:28 CEST