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ヒビノ キンヤ
Hibino Kinya 日比野 欣也 所属 神奈川大学 工学部 応用物理学科 神奈川大学大学院 工学研究科 工学専攻（応用物理学領域） 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2024/07 |
| 形態種別 | 学術雑誌 |
| 査読 | 査読あり |
| 標題 | Isotropy of COsmic Rays beyond 10^20eV Favors Their Heavy Mass Composition |
| 執筆形態 | 共著 |
| 掲載誌名 | Physical Review Letters |
| 掲載区分 | 国外 |
| 巻・号・頁 | (133),pp.041001 |
| 国際共著 | 国際共著 |
| 概要 | We report an estimation of the injected mass composition of ultrahigh energy cosmic rays (UHECRs) at energies higher than 10 EeV. The composition is inferred from an energy-dependent sky distribution of UHECR events observed by the Telescope Array surface detector by comparing it to the Large Scale Structure of the local Universe. In the case of negligible extragalactic magnetic fields (EGMFs), the results are consistent with a relatively heavy injected composition at E ∼10 EeV that becomes lighter up to E ∼100 EeV, while the composition at E >100 EeV is very heavy. The latter is true even in the presence of highest experimentally allowed extragalactic magnetic fields, while the composition at lower energies can be light if a strong EGMF is present. The effect of the uncertainty in the galactic magnetic field on these results is subdominant. |
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