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

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Genolini, Yoann ^{[1, 2]} ; Serpico, Pasquale D. ^{[1, 2]} ; Boudaud, Mathieu ^{[3, 4]} ; Caroff, Sami ^[5] ; Poulin, Vivian ^{[6, 1, 2]} ; Derome, Laurent ^[7] ; Lavalle, Julien ^{[8, 9]} ; Maurin, David ^[7] ; Poireau, Vincent ^{[2, 10]} ; Rosier, Sylvie ^{[2, 10]} ; Salati, Pierre ^{[1, 2]} ; Vecchi, Manuela ^[11]

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^[1] Univ Savoie Mt Blanc, Lab Annecy Le Vieux Phys Theor LAPTh, F-74941 Annecy - France

^[2] CNRS, F-74941 Annecy - France

^[3] CNRS, UMR 7589, LPTHE, 4 Pl Jussieu, F-75252 Paris - France

^[4] UPMC, 4 Pl Jussieu, F-75252 Paris - France

^[5] Ecole Polytech, LLR, CNRS IN2P3, F-91128 Palaiseau - France

^[6] Rhein Westfal TH Aachen, Inst Theoret Particle Phys & Cosmol TTK, D-52056 Aachen - Germany

^[7] Univ Grenoble Alpes, LPSC, CNRS IN2P3, 53 Ave Martyrs, F-38026 Grenoble - France

^[8] CNRS, LUPM, Pl Eugene Bataillon, F-34095 Montpellier 05 - France

^[9] Univ Montpellier, UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier 05 - France

^[10] Univ Savoie Mt Blanc, LAPP, F-74941 Annecy - France

^[11] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 119, n. 24 DEC 15 2017.
• Citações Web of Science: 23

Resumo

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. (AU)

• Processo FAPESP: 14/19149-7 - Busca indireta de matéria escura com o detector AMS-02
• Beneficiário: Manuela Vecchi
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/50747-8 - Indirect dark matter search with AMS-02 data
• Beneficiário: Manuela Vecchi
• Modalidade de apoio: Auxílio à Pesquisa - Regular