Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Cosmic rays 5

T 54.3: Talk

Wednesday, March 6, 2024, 16:30–16:45, Geb. 20.30: 2.059

UHECR probability distributions in bursting sources — •Leonel Morejon — Wuppertal University, Gaußstr. 20, 42119 Wuppertal

The origin of Ultra-High Energy Cosmic Rays (UHECRs) is still unknown, although much progress has been made in understanding the necessary conditions to produce them. The current list of potential sources is reduced to a few classes of extreme phenomena, many of which are transient or experience variable emission (bursts). Source parameters (luminosity, size, magnetic field, etc.) may be inferred from the observed electromagnetic emissions, but estimating the ejected UHECRs requires knowledge of the injected composition and precise modelling of the nuclear interactions producing nuclear cascades. This means computing the energy densities of ∼100 nuclear species for a wide range of initial conditions and source scenarios accurately and fast. A framework able to do this within seconds would be a strong asset in the study of UHECR sources. This contribution discusses ongoing efforts to develop such framework with a novel stochastic approach to describe the interactions and cascades of UHECRs up to their escape from the source. Results are shown for examples of bursting sources where possible ejected compositions are obtained with associated likelihoods. The efficiency and simplicity of the approach is demonstrated by comparison with the Monte Carlo code CRPropa widely employed to simulate nuclear interactions in the propagation of UHECRs.

*Funded by the Deutsche Forschungsgemeinschaft through project MICRO (KA/710-5).

Keywords: stochastic; UHECR sources; multi-messengers; analytical; bursting sources