Re: [fluka-discuss]: yield of muon induced neutron and size of detector

From: paola sala <paola.sala_at_cern.ch>
Date: Tue, 28 Oct 2014 18:51:57 +0100

Hello,
may I ask you two things? First, how do you calculate the "neutron
yield" ? Second, what do you have in your geometry? The detector alone
or also the rock around?
  The explanation I can guess is that if you look at neutron flux or
interactions in the detector, when the detector is small many neutrons
will escape, while in a large detector they will build up a cascade. In
addition, neutrons will also be produced through photonuclear
interactions by photons whenever the muons produce electromagnetic
showers, and also in this case particles will escape from small
detectors. One should try to reproduce the experimental conditions,
activate photonuclear interactions by photons, and take into account
also the surrounding materials, where particles can be produced and
reach the detector, and neutrons can be reflected back into it.
.Hope this helps
Paola

On 10/28/2014 02:32 PM, lidengjie wrote:
> Hi fluka experts,
> Recently,I did muon simulations in underground neutrion experiment
> using fluka.
> I'm confused that the yield of muon induced neutron is related to size
> of the detector,or we can say that it's related to the average track
> length of muon,the following table is the result I have tested with
> different sizes of detector.I want to know whether this result is
> reasonable or not ,and if there is a CARD that can control this.
>
> average track length of muon （cm） neutron yield when muon's kenetic
> energy is 260GeV
> /u/(g cm^-2) neutron yield when muon's kenetic energy is 56GeV
> /u/(g cm^-2)
> 5000 18*10^-5 7.43*10^-5
> 650 18*10^-5 6.74*10^-5
> 350 13*10^-5 5.6*10^-5
> 310 10*10^-5
> 212 8.9*10^-5 5*10^-5
>
>
>
> Here is the result from KamLand neutrino experiment.
>
>
> ------------------------------------------------------------------------
> Best regards,
> Li Dengjie
> IHEP
>
Received on Tue Oct 28 2014 - 20:25:26 CET