July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

The distribution of shower longitudinal profile widths as measured by Telescope Array in stereo mode

Jul 30, 2015, 3:30 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 223
Poster contribution CR-EX Poster 1 CR


Douglas Bergman (University of Utah)


Observing UHECR air showers in stereo mode provides a precise measurement of their longitudinal profiles. The Gaisser-Hillas function fits air shower profiles well on average. The range of shower widths can be sensitive to details of average inelasticity and multiplicity in the early part of the shower. Such a measurement can then also be used to constrain the interaction models used in simulating UHECRs. This work can augment the conventional stereo composition measurement. The distribution of the Gaisser-Hillas function FWHM value will be made in bins of energy, matching the bins used in the stereo composition analysis. These distribution will then be compared to Monte Carlo simulations using standard interaction models (QGSJet, Sibyll, EPOS).
Collaboration Telescope Array
Registration number following "ICRC2015-I/" 712

Primary author

Douglas Bergman (University of Utah)

Presentation materials

There are no materials yet.