Re: [fluka-discuss]: BEAMPART in a proton-H elastic interaction

From: Alfredo Ferrari <alfredo.ferrari_at_cern.ch>
Date: Tue, 15 Mar 2016 07:49:30 +0100

Dear Ana,

it depends on the kind of interaction. For nonelastic ones (starting at
the pion production threshold, ~290 MeV), all outcoming protons are
considered secondaries (hence none of them is "BEAMPART"). For elastic
interactions, since protons are indistinguishable, there is no such thing
as the "incident proton" in the final state. FLUKA considers primary
the highest energy one, which is consistent with how the p-p elastic cross
section is referenced in the literature, that is from 0 to 90 deg
in the centre-of-mass, rather than from 0 to 180. Of course it is
purely conventional and it does not change at all the physics, it matters
only when one is dividing scores into primaries and secondaries.

                 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 |
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+----------------------------------------------------------------------+

On Tue, 15 Mar 2016, Ferreira De Almeida Lourenco, Ana wrote:

>
> Dear Fluka experts,
>
>
> In a proton-H elastic interaction, is the proton with the largest energy
> considered as primary in BEAMPART or is the incident proton independently of
> its energy?
>
>
> Many thanks,
>
> Ana
>
>
>
>

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Received on Tue Mar 15 2016 - 09:25:38 CET

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