Towards understanding the origin of cosmic-ray positrons.
AGUILAR, M.; BUENO, E. F.; VECCHI, Manuela.
AGUILAR, M.; BUENO, E. F.; VECCHI, Manuela.
 Abstract: Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2 1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284þ91 -64 GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of Es ¼ 810þ310 -180 GeV is established with a significance of more than 4s. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources. | |
| Physical Review Letters |
| v. 122, n. 4, p. 041102-1-041102-9 - Ano: 2019 |
| Fator de Impacto: 8,839 |
| http://dx.doi.org/10.1103/PhysRevLett.122.041102 |  @article={002926869,author = {AGUILAR, M.; BUENO, E. F.; VECCHI, Manuela.},title={Towards understanding the origin of cosmic-ray positrons},journal={Physical Review Letters},note={v. 122, n. 4, p. 041102-1-041102-9},year={2019}} |