Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO

Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO

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. LH...

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Main Authors: Cao Z., Ma L.L., Zhang S.S., Wang C., Yin L.Q., Bi B.Y.
Format: Article
Language:English
Published: EDP Sciences 2019-01-01
Series:EPJ Web of Conferences
Online Access:https://www.epj-conferences.org/articles/epjconf/pdf/2019/13/epjconf_isvhecri2018_14002.pdf
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spelling doaj-340bcdba013c44c298c7e9f4825eadf52021-08-02T16:04:17ZengEDP SciencesEPJ Web of Conferences2100-014X2019-01-012081400210.1051/epjconf/201920814002epjconf_isvhecri2018_14002Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASOCao Z.Ma L.L.Zhang S.S.Wang C.Yin L.Q.Bi B.Y.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.https://www.epj-conferences.org/articles/epjconf/pdf/2019/13/epjconf_isvhecri2018_14002.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Cao Z.
Ma L.L.
Zhang S.S.
Wang C.
Yin L.Q.
Bi B.Y.
spellingShingle Cao Z.
Ma L.L.
Zhang S.S.
Wang C.
Yin L.Q.
Bi B.Y.
Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
EPJ Web of Conferences
author_facet Cao Z.
Ma L.L.
Zhang S.S.
Wang C.
Yin L.Q.
Bi B.Y.
author_sort Cao Z.
title Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
title_short Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
title_full Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
title_fullStr Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
title_full_unstemmed Measurement of knees of the spectra of heavy nuclei above 10 PeV with LHAASO
title_sort measurement of knees of the spectra of heavy nuclei above 10 pev with lhaaso
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2019-01-01
description 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.
url https://www.epj-conferences.org/articles/epjconf/pdf/2019/13/epjconf_isvhecri2018_14002.pdf
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