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

From: Helga Holmestad <helga.holmestad_at_cern.ch>
Date: Tue, 4 Nov 2014 11:50:22 +0000

Thanks a lot for the help I got to sort out the mistake in my simulations, when I did everything right there is no large discrepancy between data and simulations.l
I am still very interested in finding the answer to my first question:

- What are the models used to simulate antiproton annihilation in different material? Where can I find more information about this?

Hope
________________________________
From: Helga Holmestad
Sent: 27 October 2014 12:09
To: fluka-discuss_at_fluka.org
Subject: Antiproton annihilation in materials

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 Nov 04 2014 - 14:13:03 CET