RE: [fluka-discuss]: Antiproton annihilation in materials

From: Helga Holmestad <helga.holmestad_at_cern.ch>
Date: Tue, 28 Oct 2014 13:52:13 +0000

Thanks a lot for the help Paola. I see that I did a mistake when it came to the material. When I fixed this everything looks resonable

Helga


________________________________
From: Paola Sala
Sent: 27 October 2014 15:37
To: Helga Holmestad; fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: Antiproton annihilation in materials

Dear Helga
it's strange..I made a quick check for protons only, in the energy range you give (6-18 MeV) and I find 17.6 %, with the same version.
Are you sure that you selected only protons that come from the annihilation, excluding those generated by reinteractions of secondaries in the target?
Regards
Paola
On 10/27/2014 12:09 PM, Helga Holmestad wrote:
Dear experts


I am working in the AEgIS collaboration with simulations of detectors for low energy anti-protons. This autumn we are going to have a testbeam with the timepix3 detector which gives us an opportunity to study antiproton annihilation in materials. Therefore I am very interested in how FLUKA does annihilation of anti-protons especially in silicon, but also other materials. I have some questions I hope you are could answer me:

- What are the models used to simulate antiproton annihilation in different material? Where can I find more information about this.
- How is the models tested against data? I see very little data on antiproton annihilation, it is mainly LEAR data. In the table below I have compared some of the LEAR data to FLUKA simulations. It looks almost reasonable for everything else than protons. Is there an explanation for the discrepancy? I have also attached the article that this data is taken from (see table 5)


Table showing the multiplicity of fragments from 100 annihilation in Carbon12.

Particle Energy range(MeV) LEAR FLUKA
proton 6-18 23.3+-2.0 61.57+-8.94
deteron 8-24 9.3 +-0.8 16.87+-1.29
triton 11-29 4.5+-0.4 4.70+-0.17
helium3 36-70 1.72+-0.17 0.54+-0.01
alpha 36-70 1.14+-0.12 1.54+-0.01


I have used the latest version of FLUKA which had some updates when it came to annihilation

Kind regards,

Helga
Received on Tue Oct 28 2014 - 16:20:24 CET