**From:** Tang, Alfred (*atang@phys.ksu.edu*)

**Date:** Sat Mar 24 2007 - 08:34:37 CET

**Previous message:**Alberto Fasso': "Re: Thermal Neutron Capture Gammas"**In reply to:**Giuseppe Battistoni: "Re: estimating neutron rate using USRTRACK"**Next in thread:**Giuseppe Battistoni: "RE: estimating neutron rate using USRTRACK"**Reply:**Giuseppe Battistoni: "RE: estimating neutron rate using USRTRACK"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

Dear Giuseppe,

Thank you for the pointers. I understand the concepts of fluence and USRTRACK in general. But what does it mean in principle to measure the tracklength of neutron balance? In particular, how is tracklength for particle 222 (NEUT-BALA) scored in FLUKA?

Regards,

Alfred

*****************************************************

Alfred Tang

Physics Department

Kansas State University

13 Cardwell Hall

Manhattan, KS 66506

(785) 532-1699

http://www.phys.ksu.edu/personal/atang

________________________________

From: Giuseppe Battistoni [mailto:Giuseppe.Battistoni@mi.infn.it]

Sent: Thu 3/22/2007 8:50 AM

To: Tang, Alfred

Cc: Fluka Discussion

Subject: Re: estimating neutron rate using USRTRACK

Dear Alfred,

the tracklength for a given particle type is calculated

by summing, for each primary history, the actual path covered

by those particles, without projecting to any direction.

In order to understand correctly all those issues related to the

scoring in FLUKA please refer to the lecture that you can find in:

http://www.fluka.org/course/WebCourse/scoring/index.html

Giuseppe Battistoni

On Fri, 16 Mar 2007, Tang, Alfred wrote:

*> Dear FLUKA users,
*

*>
*

*> I am trying to use USRTRACK to estimate the muon-induced neutron rate in a liquid scintillator. I use a realistic muon profile as input and propagate the muons through a realistic detector. I measure the track lengths of muon, neutron and neutron balance of the LS region and hope to deduce an estimate for the neutron rate Rn as follow:
*

*>
*

*> Rn=Rmu*A*B*C
*

*>
*

*> where Rmu=muon rate on the LS region, A=neutron_tracklength/muon_tracklength, B=neutron_balance/muon_tracklength and C=sqrt(3). A has the meaning of the ratio of the fluence of the neutron and the fluence of muon. B hopefully gives me the number of neutrons per primary muon. Assuming that the tracklength of neutron is measured only along the direction parallel to the muon track, the factor C=sqrt(3) is meant to convert neutron fluence into neutron rate.
*

*>
*

*> Since I do not know how FLUKA score tracklength, I do not know if my assumptions are correct. If I am right in assuming the things aforementioned, I am able to calculate a neutron rate for KamLAND that agrees with the experimental result exactly. Can anyone comment on the correctness of this calculation?
*

*>
*

*> Regards,
*

*> Alfred
*

*>
*

*>
*

*> *****************************************************
*

*> Alfred Tang
*

*> Physics Department
*

*> Kansas State University
*

*> 13 Cardwell Hall
*

*> Manhattan, KS 66506
*

*>
*

*> (785) 532-1699
*

*>
*

*> http://www.phys.ksu.edu/personal/atang
*

*>
*

*>
*

*>
*

*>
*

**Previous message:**Alberto Fasso': "Re: Thermal Neutron Capture Gammas"**In reply to:**Giuseppe Battistoni: "Re: estimating neutron rate using USRTRACK"**Next in thread:**Giuseppe Battistoni: "RE: estimating neutron rate using USRTRACK"**Reply:**Giuseppe Battistoni: "RE: estimating neutron rate using USRTRACK"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

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