RE: [fluka-discuss]: RE: Delta-ray production

From: Senger, Anna Dr. <A.Senger_at_gsi.de>
Date: Mon, 10 Mar 2014 13:01:44 +0000

Dear Alfredo.
I used

PHYSICS 4. EM-DISSO

but my job crashed with error:

"Subscript out of range on file line 227, procedure xeldis.f/xeldis.
Attempt to access the 81-th element of variable izelds."

Best regards
Anna

-----Original Message-----
From: Alfredo Ferrari [mailto:alfredo.ferrari_at_cern.ch]
Sent: Montag, 10. März 2014 10:44
To: Senger, Anna Dr.
Cc: 'fluka-discuss_at_fluka.org'; Alfredo.Ferrari_at_cern.ch
Subject: Re: [fluka-discuss]: RE: Delta-ray production

Dear Anna

surely it would be better to use the PRECISIOn default for your specific problem and to activate explicitly for the Au-Au case both ElectroMagnetic dissociation and heavy ion direct pair production (look at the PHYSICS card for both).

The "step" that you see in the electron spectrum for the Au-Au case is likely due to the different weigth of two components, a) the delta-rays emitted by the ions, whose end-point is exactly where you see the "step"
as you can compute yourself, and b) the e-e+ coming from pi0 production and gamma conversion or anyway more in general from nuclear interactions.

Both components exist for p-Au too, but the delta-ray component scales like Z^2 (79^2) while the nuclear component scales with something like A^2/3 -> ergo for the p-Au case the delta-ray component is much smaller in a relative sense

                         Ciao
                        Alfredo

+----------------------------------------------------------------------+
| Alfredo Ferrari || Tel.: +41.22.76.76119 |
| CERN-EN/STI || Fax.: +41.22.76.69474 |
| 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
| Switzerland || |
+----------------------------------------------------------------------+

On Mon, 10 Mar 2014, Senger, Anna Dr. wrote:

>
> Dear FLUKA experts.
>
> My question is rather important for CBM detector and electronics
> development. We found, that after 60 cm C absorber the ionizing energy
> loss due to electrons from the target is very high for 35 AGeV gold
> beam. We try to understand, it is realistic or not. I produced
> usrtrack-plot for electrons in 1mm from the target for Au and p beams.
> There is one step in the distribution for Au beam. Is it correct? And
> were all possible processes of the delta-electron production included for the Au beam for "NEW-DEFA"
> option?
>
>  
>
> Best regards
>
> Anna Senger
>
>  
>
> From: owner-fluka-discuss_at_mi.infn.it
> [mailto:owner-fluka-discuss_at_mi.infn.it]
> On Behalf Of Senger, Anna Dr.
> Sent: Mittwoch, 5. März 2014 14:25
> To: 'fluka-discuss_at_fluka.org'
> Subject: [fluka-discuss]: Delta-ray production
>
>  
>
> Dear FLUKA experts,
>
> I have a question about delta-ray production in target. I simulate Au
> beam _at_
> 35 AGeV, and I have 1% gold target.
>
> If I use "default" settings, is form factor included in delta-ray
> production in target?
>
>  
>
> Best regards
>
> Anna Senger
>
>
>
Received on Mon Mar 10 2014 - 15:10:33 CET