Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.121106
Keywords
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Categories
Funding
- Sao Paulo Research Foundation (FAPESP) [2019/10151-2, 2010/07359-6, 1999/05404-3]
- Czech Republic Grant [MSMT CR LTT18004, LM2015038, LM2018102, CZ.02.1.01/0.0/0.0/16_013/0001402, CZ.02.1.01/0.0/0.0/18_046/0016010, CZ.02.1.01/0.0/0.0/17_049/0008422]
- Institut Lagrange de Paris (ILP) within the Investissements d'Avenir Programme [LABEX ANR-10-LABX-63, ANR11-IDEX-0004-02]
- Mexico-Consejo Nacional de Ciencia y Tecnologia (CONACYT) [167733]
- SURF Cooperative
- Poland-Ministry of Science and Higher Education [DIR/WK/2018/11]
- National Science Centre [2013/08/M/ST9/00322, 2016/23/B/ST9/01635, HARMONIA 5-2013/10/M/ST9/00062, UMO-2016/22/M/ST9/00198]
- Portugal-Portuguese national funds within Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia (COMPETE)
- FEDER funds within Programa Operacional Factores de Competitividade through Fundacao para a Ciencia e a Tecnologia (COMPETE)
- Program Nucleu within MCI within PNCDI III [PN19150201/16N/2019, PN19060102, PN-III-P1-1.2-PCCDI-2017-0839/19PCCDI/2018]
- Slovenia-Slovenian Research Agency [P1-0031, P1-0385, I00033, N1-0111]
- Spain-Ministerio de Economia, Industria y Competitividad [FPA2017-85114-P, FPA2017-85197-P]
- Xunta de Galicia [ED431C 2017/07]
- Junta de Andalucia [SOMM17/6104/UGR]
- Feder Funds, RENATA Red Nacional Tematica de Astroparticulas [FPA2015-68783-REDT]
- Maria de Maeztu Unit of Excellence [MDM-2016-0692]
- USA-Department of Energy [DE-AC0207CH11359, DE-FR02-04ER41300, DE-FG0299ER41107, DE-SC0011689]
- National Science Foundation [0450696]
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We report a measurement of the energy spectrum of cosmic rays above 2.5 x 10(18) eV based on 215 030 events. New results are presented: at about 1.3 x 10(19) eV, the spectral index changes from 2.51 +/- 0.03(stat) +/- 0.05(syst) to 3.05 +/- 0.05(stat) +/- 0.10(syst), evolving to 5.1 +/- 0.3(stat) +/- 0.1(syst) beyond 5 x 10(19) eV, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with energy-dependent mass composition. The energy density in cosmic rays above 5 x 10(18) eV is [5.66 +/- 0.03(stat) +/- 1.40(syst)] x 10(53) erg Mpc(-3).
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