An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV (Articolo in rivista)

Type
Label
  • An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • O. Adriani, G. C. Barbarino, G. A. Bazilevskaya, R. Bellotti, M. Boezio, E. A. Bogomolov, L. Bonechi, M. Bongi, V. Bonvicini, S. Borisov, S. Bottai, A. Bruno, F. Cafagna, D. Campana, R. Carbone, P. Carlson, M. Casolino, G. Castellini, et al. (2009)
    An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV
    in Nature (Lond.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • O. Adriani, G. C. Barbarino, G. A. Bazilevskaya, R. Bellotti, M. Boezio, E. A. Bogomolov, L. Bonechi, M. Bongi, V. Bonvicini, S. Borisov, S. Bottai, A. Bruno, F. Cafagna, D. Campana, R. Carbone, P. Carlson, M. Casolino, G. Castellini, et al. (literal)
Pagina inizio
  • 607 (literal)
Pagina fine
  • 609 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 458 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Univ Florence, Dept Phys, I-50019 Florence, Italy 2. INFN, Sez Firenze, I-50019 Florence, Italy 3. Univ Naples Federico 2, Dept Phys, I-80126 Naples, Italy 4. INFN, Sez Napoli, I-80126 Naples, Italy 5. PN Lebedev Phys Inst, RU-119991 Moscow, Russia 6. Univ Bari, Dept Phys, I-70126 Bari, Italy 7. INFN, Sez Bari, I-70126 Bari, Italy 8. INFN, Sez Trieste, I-34149 Trieste, Italy 9. AF Ioffe Phys Tech Inst, RU-194021 St Petersburg, Russia 10. INFN, Sez Roma Tor Vergata, I-00133 Rome, Italy 11. Univ Roma Tor Vergata, Dept Phys, I-00133 Rome, Italy 12. Moscow Engn & Phys Inst, RU-11540 Moscow, Russia 13. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden 14. KTH, Dept Phys, SE-10691 Stockholm, Sweden 15. IFAC, I-50019 Florence, Italy 16. Univ Trieste, Dept Phys, I-34147 Trieste, Italy 17. Univ Siegen, Dept Phys, D-57068 Siegen, Germany 18. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy (literal)
Titolo
  • An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV (literal)
Abstract
  • Antiparticles account for a small fraction of cosmic rays and are known to be produced in interactions between cosmic-ray nuclei and atoms in the interstellar medium(1), which is referred to as a 'secondary source'. Positrons might also originate in objects such as pulsars(2) and microquasars(3) or through dark matter annihilation(4), which would be 'primary sources'. Previous statistically limited measurements(5-7) of the ratio of positron and electron fluxes have been interpreted as evidence for a primary source for the positrons, as has an increase in the total electron+positron flux at energies between 300 and 600 GeV (ref. 8). Here we report a measurement of the positron fraction in the energy range 1.5-100 GeV. We find that the positron fraction increases sharply overmuch of that range, in a way that appears to be completely inconsistent with secondary sources. We therefore conclude that a primary source, be it an astrophysical object or dark matter annihilation, is necessary. (literal)
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