Re: [fluka-discuss]: muon production frm gamma conversion or positron annhilation

From: Lewis Keller <keller_at_slac.stanford.edu>
Date: Sat, 9 Nov 2013 13:04:08 -0800

Hi Alberto,

As far as I can tell PHOTONUC only biases Bethe-Heitler production of muons. How does one bias direct annihilation, e+e- => u+u- ?

Lew Keller

On Nov 9, 2013, at 9:50 AM, "Fasso, Alberto" <fasso_at_SLAC.Stanford.EDU> wrote:

> You don't get any muons because the cross section for muon pair production is very small (about 1.E4 times smaller than that for e+e- production). You need to bias the production by a factor of that order.
> Set WHAT(2) = 1.E-4 in the PHOTONUC card with SDUM=MUMUPAIR.
>
> Alberto
> ________________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] On Behalf Of Andrea.Mairani_at_mi.infn.it [Andrea.Mairani_at_mi.infn.it]
> Sent: Saturday, November 09, 2013 8:22 AM
> To: "belgin pilišer"
> Cc: fluka-discuss_at_fluka.org
> Subject: Re: [fluka-discuss]: muon production frm gamma conversion or positron annhilation
>
> Dear User,
> Can you please send us your entire input? So we can check it and in case
> run it..
> Regards,
> Andrea
>
>> Dear Fluka Users,
>>
>> I want to produce the energy spectrum of muons from positron annihilation
>> or gamma conversion by impinging the electrons to carbon target. Is it
>> possible?
>> I read that by using PHOTONUC card, MuMuPair option can switch on.
>> I used these cards but I didn't observe the muons.
>>
>> PHOTONUC 1111. 0.0 0.0 CARBON CARBON
>> 0.0MUMUPAIR
>> USRTRACK 1. MUONS -26. TARGET 500.mu
>> USRTRACK 1500.0 500.
>> USRBIN 11. MUONS -21. 10.0 0.0 40.0mu
>> USRBIN 0.0 0.0 0.0 100.0 1.0 400. &
>> USRBIN 11. ENERGY -24. 10.0 0.0 40.0edep
>> USRBIN 0.0 0.0 0.0 100.0 1.0 400. &
>>
>> Thanks for your advice and help from now.
>>
>
>
Received on Sat Nov 09 2013 - 22:55:48 CET

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