Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B=C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B=C spectral index is reported for the first time. The B=C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B=C ratio is well described by a single power law RΔ with index Δ = −0.333 +/- 0.014 (fit) +/- 0.005 (sys), in good agreement with the Kolmogorov theory of turbulence which predicts Δ =-1/3 asymptotically.

Aguilar, M., Ali Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2016). Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(23), 1-8 [10.1103/PhysRevLett.117.231102].

Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station

CONTIN, ANDREA;MASI, NICOLO';PALMONARI, FEDERICO;QUADRANI, LUCIO;ZICHICHI, ANTONINO;
2016

Abstract

Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B=C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B=C spectral index is reported for the first time. The B=C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B=C ratio is well described by a single power law RΔ with index Δ = −0.333 +/- 0.014 (fit) +/- 0.005 (sys), in good agreement with the Kolmogorov theory of turbulence which predicts Δ =-1/3 asymptotically.
2016
Aguilar, M., Ali Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2016). Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(23), 1-8 [10.1103/PhysRevLett.117.231102].
Aguilar, M.; Ali Cavasonza, L.; Ambrosi, G.; Arruda, L.; Attig, N.; Aupetit, S.; Azzarello, P.; Bachlechner, A.; Barao, F.; Barrau, A.; Barrin, L.; Ba...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.117.231102.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 195.6 kB
Formato Adobe PDF
195.6 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/572983
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 306
  • ???jsp.display-item.citation.isi??? 443
social impact