Results on mass composition of cosmic rays as measured with LOFAR


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  • uploaded June 25, 2021

Discussion timeslot (ZOOM-Meeting): 13. July 2021 - 18:00
ZOOM-Meeting URL:
ZOOM-Meeting ID: 92210078166
ZOOM-Meeting Passcode: ICRC2021
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'We present an updated analysis of the mass composition of cosmic rays in the $10^{17}$ to $10^{18}$ eV energy range. It is based on measurements with the LOFAR telescope of the depth of shower maximum, $X_{mathrm{max}}$.rnWe review the improvements to the simulation-based reconstruction setup, as well as the selection method to obtain a minimally biased $X_mathrm{max}$-dataset. Systematic uncertainties on $X_mathrm{max}$ have been lowered to an estimated 7 to 9 $mathrm{g/cm^2}$, at a resolution of about 20 $mathrm{g/cm^2}$ per shower.rnResults include estimates of the mean and standard deviation of the $X_mathrm{max}$-distribution. A statistical analysis at distribution level has been done as well, using a 4-component model of light to heavy nuclei. rnIt confirms our previous results showing a significant low-mass fraction in this energy range.rnWe discuss consistency with existing results on Xmax and mass composition.'

Authors: Arthur Corstanje | For the LOFAR CR-KSP
Collaboration: LOFAR

Indico-ID: 632
Proceeding URL:

Presenter: Arthur Corstanje

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