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The p-He cross section measurement: a physics case from cosmic rays
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Europe/Rome
Aula ERACLITO (Torino)
Aula ERACLITO
Torino
MBC - Molecular Biology Center, via Nizza 52
Description
The interpretation of galactic cosmic ray data requires not only the correct modeling of their sources and of the turbulence spectrum of the galactic magnetic field, but also the knowledge of the cross sections that regulate the production and destruction of the particles interacting with the gas of the interstellar medium.
For many cosmic species, these cross section data are scarce when not missing completely.
Specifically, the antiprotons propagating in the Galaxy are of secondary origin,
produced by the scattering of cosmic proton and helium nuclei off the hydrogen and helium that are present in the interstellar medium. The only measured antiproton production cross section is the proton-proton one while all the reactions involving helium have no laboratory data in the antiproton energy range explored by current experiments.
It is at present of particular interest the experimental study of the antiproton flux in the energy range from about one GeV up to hundreds of GeV. The current empirical modeling of those cross sections induces an uncertainty of about 30-40\% in the prediction of the antiproton flux which could seriously limit the interpretation of the data collected in space, now provided by AMS-02 with a much smaller error.
The accurate knowledge and prediction of the cosmic antiproton flux is not only useful
to the understanding of the origin and propagation of galactic cosmic
rays, but also to the indirect dark matter searches. Indeed, the secondary
antiproton flux acts as a background to a possible dark matter signal in the observed antiproton flux.
Dark matter can be indirectly searched also in cosmic positrons, antideuterons and gamma-rays, for which similar problems due to cross section data hold.
In order to favor the discussion about the opportunity of a dedicated measurement of the p + He —> antiproton + X cross section - as well as positrons, gamma-rays and antideuterons in the final state - we are organizing a meeting in:
Torino - July 6 and 7, 2015
in collaboration with the Torino University and INFN.
The main idea of the workshop is to favor brainstorming among the
participants.
The format of the meeting is intended to be informal.
All the people aiming at giving a talk are warmly welcome.
It is particularly encouraged the participation of the experimental
colleagues and collaborations with expertise and interest in the field.
Logistics: the meeting will be held at the
Molecular Biology Center, MBC, via Nizza 52, TORINO
at a walking distance (or two metro stops) from the Porta Nuova railway
station, as well as from the Physics Department.
No fee applies.
For practical purposes, I kindly ask all the participants to register.
As for talks, one can either apply on the above indico page or write
directly to donato@to.infn.it
Participants
Alessandro BOTTINO
Alessia Tricomi
Andrea Vittino
Andreas Goudelis
Artem Ivanov
Bakur Parsamyan
Bruna Bertucci
Carlo Giunti
Chiara Oppedisano
daniele panzieri
Ezio Menichetti
Federico Ceccopieri
Fiorenza Donato
Francesca Giovacchini
Giovanni Ambrosi
Hannes-S. Zechlin
Marco Regis
Marta Ruspa
Martin Winkler
Mattia Di Mauro
Mirko Boezio
Nadia Pastrone
Nicola Tomassetti
Nicolao Fornengo
Noemi Finetti
Oleg Denisov
Oscar Adriani
Paolo Lipari
Paolo Zuccon
Philip von Doetinchem
Rene Ong
Riccardo Longo
Roberto Mussa
Valerio Formato
