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Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data

Title
Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data
Authors
Tanaka H.Tanaka K.Tanaka M.Thomas S.B.Thomson G.B.Tinyakov P.Tkachev I.Tokuno H.Tomida T.Troitsky S.Tsunesada Y.Ito H.Ivanov D.Jeong H.M.Jeong S.Jui C.C.H.Kadota K.Kakimoto F.Kalashev O.Kasahara K.Kawai H.Ohoka H.Kawakami S.Kawana S.Kawata K.Kim H.B.Kim J.H.Kishigami S.Kitamura S.Kitamura Y.Kuzmin V.Kuznetsov M.Okuda T.Kwon Y.J.Lee K.H.Lubsandorzhiev B.Lundquist J.P.Machida K.Martens K.Matsuyama T.Matthews J.N.Mayta R.Minamino M.Omura Y.Kido E.Mukai K.Myers I.Nagasawa K.Nagataki S.Nakamura R.Nakamura T.Nonaka T.Oda H.Ogio S.Ono M.Ogura J.Ohnishi M.Onogi R.Oshima A.Ozawa S.Park I.H.Piskunov M.S.Pshirkov M.S.Tsutsumi K.Remington J.Rodriguez D.C.Rubtsov G.Ryu D.Sagawa H.Sahara R.Saito K.Saito Y.Sakaki N.Sakurai N.Tameda Y.Scott L.M.Seki T.Sekino K.Shah P.D.Shibata F.Shibata T.Shimodaira H.Shin B.K.Shin H.S.Smith J.D.Uchihori Y.Sokolsky P.Stokes B.T.Stratton S.R.Stroman T.A.Suzawa T.Takagi Y.Takahashi Y.Takamura M.Takeda M.Takeishi R.Udo S.Taketa A.Takita M.Urban F.Wong T.Yada K.Yamamoto M.Yamane R.Yamaoka H.Yamazaki K.Yang J.Yashiro K.Yoneda Y.Yoshida S.Yoshii H.Zhezher Y.Zundel Z.Abbasi R.U.Abe M.Abu-Zayyad T.Allen M.Azuma R.Barcikowski E.Belz J.W.Bergman D.R.Blake S.A.Cady R.Cheon B.G.Chiba J.Chikawa M.Di Matteo A.Fujii T.Fujita K.Fukushima M.Furlich G.Goto T.Hanlon W.Hayashi M.Hayashi Y.Hayashida N.Hibino K.Honda K.Ikeda D.Inoue N.Ishii T.Ishimori R.
Ewha Authors
양종만
SCOPUS Author ID
양종만scopus
Issue Date
2019
Journal Title
Physical Review D
ISSN
2470-0010JCR Link
Citation
Physical Review D vol. 99, no. 2
Publisher
American Physical Society
Indexed
SCI; SCIE; SCOPUS scopus
Document Type
Article
Abstract
The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. The analysis employs the Boosted Decision tree (BDT) multivariate analysis built upon 14 observables related to both the properties of the shower front and the lateral distribution function. The multivariate classifier is trained with Monte-Carlo sets of events induced by the primary protons and iron. An average atomic mass of UHECR is presented for energies 1018.0-1020.0 eV. The average atomic mass of primary particles shows no significant energy dependence and corresponds to lnA = 2.0±0.1(stat.)±0.44(syst.). The result is compared to the mass composition obtained by the Telescope Array with Xmax technique along with the results of other experiments. Possible systematic errors of the method are discussed. © 2019 American Physical Society.
DOI
10.1103/PhysRevD.99.022002
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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