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Description
The DArk Matter Particle Explorer (DAMPE), which is a space-based high energy particle detector, has been operated in orbit for ten years. Thanks to its large geometric factor, good charge resolution and wide dynamic range in energy measurement, DAMPE can provide valuable insights on the energy spectra of cosmic-ray up to hundreds of TeV. Using nine years of on-orbit data, the DAMPE collaboration has recently reported direct measurements of the carbon, oxygen, and iron spectra over rigidity ranges from ∼20 GV to ∼100 TV (∼60 TV for iron). Distinct spectral softening features have been identified in these spectra for the first time. When combined with updated proton and helium spectra, the charge-dependent softening is found to occur universally at a rigidity of approximately 15 TV. A hypothesis in which the softening depends on nuclear mass is disfavored at a significance level of 4.4σ.
| 请选择分会 | 中微子物理、粒子天体物理与宇宙学 |
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