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

Yoann Génolini, Pasquale D. Serpico, Mathieu Boudaud, Sami Caroff, Vivian Poulin, Laurent Derome, Julien Lavalle, David Maurin, Vincent Poireau, Sylvie Rosier, Pierre Salati, and Manuela Vecchi
Phys. Rev. Lett. 119, 241101 – Published 15 December 2017
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Abstract

Using cosmic-ray boron to carbon ratio (B/C) data recently released by the Ams-02 experiment, we find indications (decisive evidence, in Bayesian terms) in favor of a diffusive propagation 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.

  • Figure
  • Figure
  • Received 5 July 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.241101

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsPlasma Physics

Authors & Affiliations

Yoann Génolini1,*, Pasquale D. Serpico1,†, Mathieu Boudaud2, Sami Caroff3, Vivian Poulin1,4, Laurent Derome5, Julien Lavalle6, David Maurin5, Vincent Poireau7, Sylvie Rosier7, Pierre Salati1, and Manuela Vecchi8

  • 1Laboratoire d’Annecy-Le-Vieux de Physique Théorique (LAPTh), Université Savoie Mont Blanc & CNRS, 74941 Annecy Cedex, France
  • 2Laboratoire de Physique Théorique et Hautes Énergies (LPTHE), UMR 7589 CNRS & UPMC, 4 Place Jussieu, F-75252 Paris, France
  • 3Laboratoire Leprince-Ringuet (LLR), Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France
  • 4Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen, Germany
  • 5Laboratoire de Physique Subatomique et Cosmologie (LPSC), Université Grenoble Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
  • 6Laboratoire Univers & Particules de Montpellier (LUPM), CNRS & Université de Montpellier (UMR-5299), Place Eugène Bataillon, F-34095 Montpellier Cedex 05, France
  • 7Laboratoire d’Annecy de Physique des Particules (LAPP), Université Savoie Mont Blanc & CNRS, 74941 Annecy Cedex, France
  • 8Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970, São Carlos, São Paulo, Brazil

  • *yoann.genolini@lapth.cnrs.fr
  • serpico@lapth.cnrs.fr

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Issue

Vol. 119, Iss. 24 — 15 December 2017

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