SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 40: Astro Particle Theory

T 40.4: Vortrag

Dienstag, 21. März 2023, 17:45–18:00, POT/0112

Looking for massive ALPs from SN1987A with Cherenkov detectors — •Tim Kretz — KIT TTP, Karlsruhe, Deutschland

In this talk I will discuss the production of massive axion-like-particles (ALP) via nucleon Bremsstrahlung in supernova 1987A, and review the resulting exclusion limits for the nucleon-nucleon-ALP coupling in the large coupling regime. Following an earlier suggestion by Engel et al. for QCD axions, such ALPs may be absorbed by oxygen nuclei and lead to photon signals in the MeV regime induced by de-excitation. For massive ALPS the flux at Earth is essentially mono-energetic, due to the long time of flight from SN1987A that stretches out their spectral distribution. This allows to estimate the number of detectable events in water Cherenkov detectors like Super-Kamiokande or SNO+, which I will use to derive novel exclusion limits and motivate new dedicated searches for this signal.