Ultra-Heavy Cosmic Ray Analysis with CALET on the International Space Station: Established and Developing Procedures

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 18:00
ZOOM-Meeting URL: https://icrc2021.desy.de/pf_access_abstracts
Corresponding Session: https://icrc2021-venue.desy.de/channel/Presenter-Forum-1-Evening-All-Categories/48
Abstract:
'The CALorimetric Electron Telescope (CALET) has collected over 60 months of uninterrupted data on the flux and spectrum of the Ultra-Heavy (UH) cosmic rays from Z=30 to 40. Using the latest data provided from CALET’s UH trigger, we present a newly developed UH analysis complementary to the ongoing analysis presented at this conference by Zober et al. This work introduces a new Ultra-Heavy Analysis (UHA) dataset produced from CALET production data allowing for more streamlined analysis. We detail temporal and spatial correction algorithms using both the 26Fe and 14Si peaks to improve charge resolution in the Z larger 26 region. Additionally, this work presents a new method for removing the contributions from low-Z nuclei using the McIlwain L-shell parameter in place of the previously used vertical rigidity cutoff. We show that parameterization of the data with L-shell, calculated from the IGRF13 and T05 (Tsyganenko 05) geomagnetic field models, leads to fewer events being removed from the dataset, while maintaining improved charge resolution for Z larger 26. Furthermore, we introduce Tarle function peak fitting to perform charge corrections needed as a result of any quenching effects. We show the most recent CALET UH results showing the effect of these improvements in the analysis.'

Authors: Anthony Ficklin | Brian Rauch | Wolfgang Zober | Nicholas Cannady | for the CALET Collaboration
Collaboration: CALET

Indico-ID: 657
Proceeding URL: https://pos.sissa.it/395/069