Measurements of UHECR Mass Composition by Telescope Array
Telescope Array (TA) has recently published results of nearly nine years of Xmax observations providing its highest statistics measurement of ultra high energy cosmic ray (UHECR) mass composition to date for energies exceeding 1018.2 eV. This analysis measured agreement of observed data with results...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2019-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2019/15/epjconf_uhecr18_01008.pdf |
| _version_ | 1818590923165007872 |
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| author | Hanlon William |
| author_facet | Hanlon William |
| author_sort | Hanlon William |
| collection | DOAJ |
| description | Telescope Array (TA) has recently published results of nearly nine years of Xmax observations providing its highest statistics measurement of ultra high energy cosmic ray (UHECR) mass composition to date for energies exceeding 1018.2 eV. This analysis measured agreement of observed data with results expected for four different single elements. Instead of relying only on the first and second moments of Xmax distributions, we employ a morphological test of agreement between data and Monte Carlo to allow for systematic uncertainties in data and in current UHECR hadronic models. Results of this latest analysis and implications of UHECR composition observed by TA are presented. TA can utilize different analysis methods to understand composition as both a crosscheck on results and as a tool to understand systematics affecting Xmax measurements. The different analysis efforts utilizing fluorescence detector stereo, surface detector and fluorescence detector hybrid, and surface detector-only, currently underway at TA performed to understand composition are also discussed. |
| first_indexed | 2024-12-16T10:04:15Z |
| format | Article |
| id | doaj.art-24db3670a78f4362beaaa335156ea37b |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-16T10:04:15Z |
| publishDate | 2019-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-24db3670a78f4362beaaa335156ea37b2022-12-21T22:35:43ZengEDP SciencesEPJ Web of Conferences2100-014X2019-01-012100100810.1051/epjconf/201921001008epjconf_uhecr18_01008Measurements of UHECR Mass Composition by Telescope ArrayHanlon William0University of Utah Dept. of Physics and Astronomy & High Energy Astrophysics InstituteTelescope Array (TA) has recently published results of nearly nine years of Xmax observations providing its highest statistics measurement of ultra high energy cosmic ray (UHECR) mass composition to date for energies exceeding 1018.2 eV. This analysis measured agreement of observed data with results expected for four different single elements. Instead of relying only on the first and second moments of Xmax distributions, we employ a morphological test of agreement between data and Monte Carlo to allow for systematic uncertainties in data and in current UHECR hadronic models. Results of this latest analysis and implications of UHECR composition observed by TA are presented. TA can utilize different analysis methods to understand composition as both a crosscheck on results and as a tool to understand systematics affecting Xmax measurements. The different analysis efforts utilizing fluorescence detector stereo, surface detector and fluorescence detector hybrid, and surface detector-only, currently underway at TA performed to understand composition are also discussed.https://www.epj-conferences.org/articles/epjconf/pdf/2019/15/epjconf_uhecr18_01008.pdf |
| spellingShingle | Hanlon William Measurements of UHECR Mass Composition by Telescope Array EPJ Web of Conferences |
| title | Measurements of UHECR Mass Composition by Telescope Array |
| title_full | Measurements of UHECR Mass Composition by Telescope Array |
| title_fullStr | Measurements of UHECR Mass Composition by Telescope Array |
| title_full_unstemmed | Measurements of UHECR Mass Composition by Telescope Array |
| title_short | Measurements of UHECR Mass Composition by Telescope Array |
| title_sort | measurements of uhecr mass composition by telescope array |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2019/15/epjconf_uhecr18_01008.pdf |
| work_keys_str_mv | AT hanlonwilliam measurementsofuhecrmasscompositionbytelescopearray |