| Issue |
EPJ Web Conf.
Volume 208, 2019
ISVHECRI 2018 - XX International Symposium on Very High Energy Cosmic Ray Interactions
|
|
|---|---|---|
| Article Number | 14002 | |
| Number of page(s) | 6 | |
| Section | Cosmic Ray Experiments (γ-rays) | |
| DOI | https://doi.org/10.1051/epjconf/201920814002 | |
| Published online | 10 May 2019 | |
https://doi.org/10.1051/epjconf/201920814002
Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
Institute of High Energy Physics 19B, Yuquan St., Shijingshan, Beijing, China, 100049
* e-mail: caozh@ihep.ac.cn
Published online: 10 May 2019
Measuring the knees of the cosmic ray spectra for individual species is a very important approach to solve the problem of the origin of ultra high energy galactic cosmic rays. The knee of the iron spectrum is implied to be above 10 PeV from previous experiments, such as ARGO-YBJ and LHAASO-WFCTA. LHAASO is a suitable size for measurements with the required precision. The key is to separate iron nuclei from all cosmic ray samples. In this paper, we identify a couple of variables that are sensitive to the composition of showers recorded by the detector arrays in LHAASO. A multi variate analysis is proposed for the separation. The efficiency and purity of the selection for demanded species are optimized by well configuring the LHAASO array using the LHAASO simulation tools.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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