527 research outputs found
Atmospheric Calorimetry above 10 eV: Shooting Lasers at the Pierre Auger Cosmic-Ray Observatory
The Pierre Auger Cosmic-Ray Observatory uses the earth's atmosphere as a
calorimeter to measure extensive air-showers created by particles of
astrophysical origin. Some of these particles carry joules of energy. At these
extreme energies, test beams are not available in the conventional sense. Yet
understanding the energy response of the observatory is important. For example,
the propagation distance of the highest energy cosmic-rays through the cosmic
microwave background radiation (CMBR) is predicted to be strong function of
energy. This paper will discuss recently reported results from the observatory
and the use of calibrated pulsed UV laser "test-beams" that simulate the
optical signatures of ultra-high energy cosmic rays. The status of the much
larger 200,000 km companion detector planned for the northern hemisphere
will also be outlined.Comment: 6 pages, 11 figures XIII International Conference on Calorimetry in
High Energy Physic
Search for photons above 1019 eV with the surface detector of the Pierre Auger Observatory
We use the surface detector of the Pierre Auger Observatory to search for air
showers initiated by photons with an energy above 1019 eV. Photons in the zenith angle range
from 30 to 60 can be identified in the overwhelming background of showers initiated by
charged cosmic rays through the broader time structure of the signals induced in the water-
Cherenkov detectors of the array and the steeper lateral distribution of shower particles
reaching ground. Applying the search method to data collected between January 2004 and
June 2020, upper limits at 95% CL are set to an E−2 diffuse flux of ultra-high energy
photons above 1019 eV, 2×1019 eV and 4×1019 eV amounting to 2.11×10−3, 3.12×10−4 and
1.72×10−4 km−2 sr−1 yr−1, respectively. While the sensitivity of the present search around
2×1019 eV approaches expectations of cosmogenic photon fluxes in the case of a pure-proton
composition, it is one order of magnitude above those from more realistic mixed-composition
models. The inferred limits have also implications for the search of super-heavy dark matter
that are discussed and illustrated.ANPCyT
Spanish GovernmentConsejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)Australian Research CouncilFonds de la Recherche Scientifique - FNRSFWOFinanciadora de Inovacao e Pesquisa (Finep)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) 2019/10151-2
2010/07359-6
1999/05404-3Czech Republic GovernmentMinistry of Education, Youth & Sports - Czech Republic LTT18004Marie Curie-IRSES/EPLANETCentre National de la Recherche Scientifique (CNRS)Conseil Rgional Ile-de-France PNC-IN2P3/CNRSInstitut Lagrange de Paris (ILP)LABEX ANR-10-LABX-63
ANR-11-IDEX-0004-02Federal Ministry of Education & Research (BMBF)German Research Foundation (DFG)Helmholtz Alliance for As-troparticle Physics (HAP)Helmholtz AssociationMinisterium fuuml;r Kultur und Wissenschaft des Landes Nordrhein-WestfalenMinisterium fuuml;r Wissenschaft, Forschung und Kunst des Landes Baden-Wuuml;rttemberg; Italy - Istituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Universities and Research (MIUR)Ministry of Foreign Affairs and International Cooperation (Italy)Consejo Nacional de Ciencia y Tecnologia (CONACyT) 167733Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT)
Universidad Nacional Autonoma de MexicoNetherlands Organization for Scientific Research (NWO) DIR/WK/2018/11National Science Centre, Poland 2016/22/M/ST9/00198
2016/23/B/ST9/01635
2020/39/B/ST9/01398FEDER funds within Programa Operacional Factores de CompetitividadeRomania - Ministry of Research, Inno-vation and Digitization, CNCS/CCCDI UEFISCDINational Nucleus Program TE128
PN-III-P1-1.1-TE-2021-0924/TE57/2022
PED289Slovenian Research Agency - Slovenia P1-0031Spanish Government FPA2017-85114-P
PID2019-104676GB-C32Xunta de Galicia ED431C 2017/07Junta de Andalucia SOMM17/6104/UGR
P18-FR-4314
FPA2015-68783-REDTMaria de Maeztu Unit of Excellence MDM-2016-0692United States Department of Energy (DOE) DE-AC02-07CH11359National Science Foundation (NSF) 0450696Grainger FoundationEuropean Particle Physics Latin American NetworkSpanish Governmen
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