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T: Fachverband Teilchenphysik

T 15: Cosmic Rays I

T 15.2: Vortrag

Montag, 31. März 2025, 17:00–17:15, VG 3.102

Advancing Cosmic-Ray Studies with LOFAR and the LORA Scintillator Array — •Stuti Sharma¹ and Anna Nelles^1,2 for the LOFAR-Cosmic ray key science project collaboration — ¹ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

The Low Frequency Array (LOFAR) is a radio telescope with antenna fields across Netherlands and Europe. Designed to observe the radio sky at low frequencies, it also provides precision measurements of the radio emission of cosmic-ray air showers in the range of 30-80 MHz. Central to LOFAR's cosmic-ray key science project is the LOFAR Radboud Air Shower Array (LORA), an array of 40 scintillation detectors in LOFAR's dense core. LORA measures particle densities from air showers, serving as a trigger for the LOFAR antennas and providing initial estimates of shower direction, energy, and core position. It detects cosmic rays above 1e16 eV, with nanosecond timing ensuring precise reconstruction of shower geometry and radio footprint. The LORA upgrade doubled the detector count, expanding the effective area and increasing trigger rates for high-energy events by 45%. This enhancement reduces composition bias and improves sensitivity to proton and iron primaries, essential for exploring the galactic-to-extragalactic cosmic-ray transition. Our goal is to incorporate data from LORA into the radio reconstruction framework, facilitating both standalone and integrated analyses of cosmic ray in particle and radio data.

Keywords: The Low Frequency Array (LOFAR); LOFAR Radboud Air Shower Array (LORA); Cosmic Rays; Scintillator Array; Astroparticle Physics