Galactic gamma-ray and neutrino emission from interacting cosmic-ray nuclei. (arXiv:2201.03984v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Breuhaus_M/0/1/0/all/0/1">M. Breuhaus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hinton_J/0/1/0/all/0/1">J. A. Hinton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Joshi_V/0/1/0/all/0/1">V. Joshi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reville_B/0/1/0/all/0/1">B. Reville</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schoorlemmer_H/0/1/0/all/0/1">H. Schoorlemmer</a>
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
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.
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
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.
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