publication . Article . Conference object . Preprint . 2017

Indications for a High-Rigidity Break in the Cosmic-Ray Diffusion Coefficient

Yoann Genolini; Pasquale Dario Serpico; Mathieu Boudaud; Sami Caroff; Vivian Poulin; Laurent Derome; Julien Lavalle; David Maurin; V. Poireau; Sylvie Rosier; ...
Open Access English
  • Published: 12 Jul 2017 Journal: Physical Review Letters, volume 119, issue 24 (issn: 0031-9007, eissn: 1079-7114, Copyright policy)
  • 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.
Subjects
free text keywords: [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], General Physics and Astronomy, Astrophysics - High Energy Astrophysical Phenomena, Cosmic ray, Helium, chemistry.chemical_element, chemistry, Fission, Proton, Physics, Spectral line, Alpha particle, Spallation, Boron, Nuclear physics, Atomic physics, Rigidity (psychology), Carbon
Funded by
ANR| OCEVU
Project
OCEVU
Origines, Constituants et EVolution de l'Univers
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: ANR-11-LABX-0060
,
EC| InvisiblesPlus
Project
InvisiblesPlus
InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
Validated by funder
,
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
Validated by funder
,
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| 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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