publication . Conference object . Preprint . Article . 2017

Indications for a high-rigidity break in the cosmic-ray diffusion coefficient

Julien Lavalle; Pierre Salati; Pasquale Dario Serpico; Sami Caroff; Vivian Poulin; V. Poireau; Manuela Vecchi; David Maurin; Laurent Derome; Mathieu Boudaud; ...
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Open Access English
  • Published: 12 Jul 2017
  • Publisher: HAL CCSD
  • Country: France
Abstract
Using cosmic-ray boron to carbon ratio (B/C) data recently released by the AMS-02 experiment, we find tantalizing indications ({\it decisive evidence}, in Bayesian terms) in favor of a diffusive origin for the broken power-law spectra found in protons ($p$) and helium nuclei (He). The result is robust with respect to currently estimated uncertainties in the cross sections, and in the presence of a small component of primary boron, expected because of spallation at the acceleration site. Reduced errors at high energy as well as further cosmic ray nuclei data (as absolute spectra of C, N, O, Li, Be) may definitively confirm this scenario.
doi: 10.22323/1.301.0268 , 10.1103/physrevlett.119.241101
Subjects
free text keywords: [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], General Physics and Astronomy, Proton, Cosmic ray, Spallation, Rigidity (psychology), Carbon, chemistry.chemical_element, chemistry, Helium, Boron, Physics, Spectral line, Nuclear physics, Alpha particle, Fission, Atomic physics
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Funded by
EC| InvisiblesPlus
Project
InvisiblesPlus
InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
, ANR| DMASTROLHC
Project
DMASTROLHC
IDENTIFICATION OF DM : FROM ASTROPHYSICS TO THE LHC
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: ANR-12-BS05-0006
, EC| ELUSIVES
Project
ELUSIVES
The Elusives Enterprise: Asymmetries of the Invisible Universe
  • Funder: European Commission (EC)
  • Project Code: 674896
  • Funding stream: H2020 | MSCA-ITN-ETN
, ANR| OCEVU
Project
OCEVU
Origines, Constituants et EVolution de l'Univers
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: 11-LABX-0060
, EC| NEWDARK
Project
NEWDARK
New Directions in Dark Matter Phenomenology at the TeV scale
  • Funder: European Commission (EC)
  • Project Code: 278234
  • Funding stream: FP7 | SP2 | ERC
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