Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum

Aab, A.; Abreu, P.; Aglietta, M.; Ahn, E.J.; Al Samarai, I.; Albuquerque, I.F.M.; Allekotte, I.; Allison, P.; Almela, A.; Alvarez Castillo, J.; Alvarez-Muñiz, J.; Ambrosio, M.; Anastasi, G.A.; Anchordoqui, L.; Andrada, B.; Andringa, S.; Aramo, C.; Arqueros, F.; Arsene, N.; Asorey, H.; Assis, P.; Aublin, J.; Avila, G.; Badescu, A.M.; Balaceanu, A.; Baus, C.; Beatty, J.J.; Becker, K.H.; Bellido, J.A.; Berat, C.; Bertaina, M.E.; Biermann, P.L.; Billoir, P.; Biteau, J.; Blaess, S.G.; Blanco, A.; Blazek, J.; Bleve, C.; Boháčová, M.; Boncioli, D.; Bonifazi, C.; Borodai, N.; Botti, A.M.; Brack, J.; Brancus, I.; Bretz, T.; Bridgeman, A.; Briechle, F.L.; Buchholz, P.; Bueno, A.; Buitink, S.; Buscemi, M.; Caballero-Mora, K.S.; Caccianiga, B.; Caccianiga, L.; Cancio, A.; Canfora, F.; Caramete, L.; Caruso, R.; Castellina, A.; Cataldi, G.; Cazon, L.; Cester, R.; Chavez, A.G.; Chiavassa, A.; Chinellato, J.A.; Chudoba, J.; Clay, R.W.; Colalillo, R.; Coleman, A.; Collica, L.; Coluccia, M.R.; Conceição, R.; Contreras, F.; Cooper, M.J.; Coutu, S.; Covault, C.E.; Cronin, J.; Dallier, R.; D'Amico, S.; Daniel, B.; Dasso, S.; Daumiller, K.; Dawson, B.R.; de Almeida, R.M.; de Jong, S.J.; De Mauro, G.; de Mello Neto, J.R.T.; De Mitri, I.; de Oliveira, J.; de Souza, V.; Debatin, J.; del Peral, L.; Deligny, O.; Di Giulio, C.; Di Matteo, A.; Díaz Castro, M.L.; Diogo, F.; Dobrigkeit, C.; D'Olivo, J.C.; Dorofeev, A.; dos Anjos, R.C.; Dova, M.T.; Dundovic, A.; Ebr, J.; Engel, R.; Erdmann, M.; Erfani, M.; Escobar, C.O.; Espadanal, J.; Etchegoyen, A.; Falcke, H.; Fang, K.; Farrar, G.; Fauth, A.C.; Fazzini, N.; Fick, B.; Figueira, J.M.; Filevich, A.; Filipčič, A.; Fratu, O.; Freire, M.M.; Fujii, T.; Fuster, A.; García, B.; Garcia-Pinto, D.; Gaté, F.; Gemmeke, H.; Gherghel-Lascu, A.; Ghia, P.L.; Giaccari, U.; Giammarchi, M.; Giller, M.; Głas, D.; Glaser, C.; Glass, H.; Golup, G.; Gómez Berisso, M.; Gómez Vitale, P.F.; González, N.; Gookin, B.; Gordon, J.; Gorgi, A.; Gorham, P.; Gouffon, P.; Grillo, A.F.; Grubb, T.D.; Guarino, F.; Guedes, G.P.; Hampel, M.R.; Hansen, P.; Harari, D.; Harrison, T.A.; Harton, J.L.; Hasankiadeh, Q.; Haungs, A.; Hebbeker, T.; Heck, D.; Heimann, P.; Herve, A.E.; Hill, G.C.; Hojvat, C.; Holt, E.; Homola, P.; Hörandel, J.R.; Horvath, P.; Hrabovský, M.; Huege, T.; Hulsman, J.; Insolia, A.; Isar, P.G.; Jandt, I.; Jansen, S.; Johnsen, J.A.; Josebachuili, M.; Kääpä, A.; Kambeitz, O.; Kampert, K.H.; Kasper, P.; Katkov, I.; Keilhauer, B.; Kemp, E.; Kieckhafer, R.M.; Klages, H.O.; Kleifges, M.; Kleinfeller, J.; Krause, R.; Krohm, N.; Kuempel, D.; Kukec Mezek, G.; Kunka, N.; Kuotb Awad, A.; LaHurd, D.; Latronico, L.; Lauscher, M.; Lautridou, P.; Lebrun, P.; Legumina, R.; Leigui de Oliveira, M.A.; Letessier-Selvon, A.; Lhenry-Yvon, I.; Link, K.; Lopes, L.; López, R.; López Casado, A.; Luce, Q.; Lucero, A.; Malacari, M.; Mallamaci, M.; Mandat, D.; Mantsch, P.; Mariazzi, A.G.; Mariş, I.C.; Marsella, G.; Martello, D.; Martinez, H.; Martínez Bravo, O.; Masías Meza, J.J.; Mathes, H.J.; 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doi:10.1016/j.physletb.2016.09.039
Evidence for a mixed mass composition at the ‘ankle’ in the cosmic-ray spectrum

A. Aab (Universität Siegen, Fachbereich 7 Physik – Experimentelle Teilchenphysik, Germany) ; P. Abreu (Laboratório de Instrumentação e Física Experimental de Partículas – LIP, Instituto Superior Técnico – IST, Universidade de Lisboa – UL, Portugal) ; M. Aglietta (INFN, Sezione di Torino, Italy; Osservatorio Astrofisico di Torino (INAF), Torino, Italy) ; E.J. Ahn (Fermi National Accelerator Laboratory, USA) ; I. Al Samarai (Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS–IN2P3, France) ; et al. - Show all 424 authors
We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of primary masses in the cosmic-ray flux. Up till now, constraints on the spread of primary masses have been dominated by systematic uncertainties. The present correlation measurement is not affected by systematics in the measurement of the depth of shower maximum or the signal in the water Cherenkov stations. The analysis relies on general characteristics of air showers and is thus robust also with respect to uncertainties in hadronic event generators. The observed correlation in the energy range around the ‘ankle’ at lg⁡(E/eV)=18.5–19.0 differs significantly from expectations for pure primary cosmic-ray compositions. A light composition made up of proton and helium only is equally inconsistent with observations. The data are explained well by a mixed composition including nuclei with mass A>4 . Scenarios such as the proton dip model, with almost pure compositions, are thus disfavored as the sole explanation of the ultrahigh-energy cosmic-ray flux at Earth.
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  "titles": [
    {
      "source": "Elsevier", 
      "title": "Evidence for a mixed mass composition at the \u2018ankle\u2019 in the cosmic-ray spectrum"
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      "source": "Elsevier", 
      "value": "We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of primary masses in the cosmic-ray flux. Up till now, constraints on the spread of primary masses have been dominated by systematic uncertainties. The present correlation measurement is not affected by systematics in the measurement of the depth of shower maximum or the signal in the water Cherenkov stations. The analysis relies on general characteristics of air showers and is thus robust also with respect to uncertainties in hadronic event generators. The observed correlation in the energy range around the \u2018ankle\u2019 at lg\u2061(E/eV)=18.5\u201319.0 differs significantly from expectations for pure primary cosmic-ray compositions. A light composition made up of proton and helium only is equally inconsistent with observations. The data are explained well by a mixed composition including nuclei with mass A&gt;4 . Scenarios such as the proton dip model, with almost pure compositions, are thus disfavored as the sole explanation of the ultrahigh-energy cosmic-ray flux at Earth."
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      "date": "2016-10-01", 
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Published on:: 01 October 2016
Publisher:: Elsevier
Published in:: Physics Letters B (2016)
DOI:: https://doi.org/10.1016/j.physletb.2016.09.039
Copyrights:: The Author(s)
Licence:: CC-BY-3.0
Fulltext files: