Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 101: Cosmic Ray 6
T 101.5: Vortrag
Donnerstag, 24. März 2022, 17:15–17:30, T-H33
Galactic gamma-ray and neutrino emission from interacting cosmic-ray nuclei — •Mischa Breuhaus1, James Anthony Hinton1, Vikas Joshi2, Brian Reville1, and Harm Schoorlemmer1,3 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, ECAP, Erwin-Rommel-Str. 1, D 91058 Erlangen, Germany — 3IMAPP, Radboud University Nijmegen, Nijmegen, The Netherlands
We present a study of the expectations for very/ultra high energy (VHE/UHE) gamma-ray and neutrino emission from interacting cosmic rays in our Galaxy and a comparison to the latest results for the Galactic UHE diffuse emission. We demonstrate the importance of properly accounting for the mixed cosmic-ray composition as well as gamma-ray absorption. We adopt the wounded-nucleon model of nuclei interaction and provide parameterisations of the resulting gamma-ray and neutrino production. Nucleon shielding due to clustering inside nuclei is shown to have a measurable effect on the production of gamma-rays and is particularly evident close to breaks and cut-offs in mixed composition particle spectra. The change in composition around the `knee' in the cosmic ray spectrum has a noticeable impact on the diffuse neutrino and gamma-ray emission spectra. We show that current and near-future detectors can probe these differences in the key energy range from 10 TeV to 1 PeV, testing the paradigm of the universality of the cosmic ray spectrum and composition throughout the Galaxy.