An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE
Xu, Zun-Lei1,2; Duan, Kai-Kai1,2; Shen, Zhao-Qiang1,2; Lei, Shi-Jun1; Dong, Tie-Kuang1; Gargano, Fabio3; Garrappa, Simone4,5; Guo, Dong-Ya6; Jiang, Wei1,2; Li, Xiang1; Liang, Yun-Feng1; Mazziotta, Mario Nicola3; Salinas, Maria Fernanda Munoz7; Su, Meng1; Vagelli, Valerio4,5; Yuan, Qiang1,8; Yue, Chuan1,2; Zang, Jing-Jing1; Zhang, Ya-Peng9; Zhang, Yun-Long10; Zimmer, Stephan7

The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, which was launched on 2015 December 17, is a new high energy cosmic ray and gamma-ray satellite-borne observatory. One of the main scientific goals of DAMPE is to observe GeV-TeV high energy gamma-ray with accurate energy, angular and time resolution, to indirectly search for dark matter particles and for the study of high energy astrophysics. Due to the comparatively higher fluxes of charged cosmic rays with respect to gamma-ray, it is challenging to identify gamma-ray with sufficiently high efficiency, minimizing the amount of charged cosmic ray contamination. In this work we present a method to identify gamma-ray in DAMPE data based on Monte Carlo simulations, using the powerful electromagnetic/hadronic shower discrimination provided by the calorimeter and the veto detection of charged particles provided by the plastic scintillation detector. Monte Carlo simulations show that after this selection the number of electrons and protons that contaminate the selected gamma-ray events at similar to 10GeV amounts to less than 1% of the selected sample. Finally, we use flight data to verify the effectiveness of the method by highlighting known gamma-ray sources in the sky and by reconstructing preliminary light curves of the Geminga pulsar.

Keywordgamma rays: general instrumentation: detectors methods: data analysis
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000428268500003
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Document Type期刊论文
Corresponding AuthorXu, Zun-Lei
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Ist Nazl Fis Nucl, Sez Bari, I-70125 Bari, Italy
4.Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
5.Univ Perugia, Dipartimento Fis & Geol, I-06123 Perugia, Italy
6.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
7.Univ Geneva, Dept Nucl & Particle Phys, CH-1211 Geneva, Switzerland
8.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
9.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
10.Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Anhui, Peoples R China
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Xu, Zun-Lei,Duan, Kai-Kai,Shen, Zhao-Qiang,et al. An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(3):12.
APA Xu, Zun-Lei.,Duan, Kai-Kai.,Shen, Zhao-Qiang.,Lei, Shi-Jun.,Dong, Tie-Kuang.,...&Zimmer, Stephan.(2018).An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(3),12.
MLA Xu, Zun-Lei,et al."An algorithm to resolve gamma-rays from charged cosmic rays with DAMPE".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.3(2018):12.
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