Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission.
Journal
Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141
Informations de publication
Date de publication:
21 May 2021
21 May 2021
Historique:
received:
05
01
2021
revised:
25
03
2021
accepted:
06
04
2021
entrez:
10
6
2021
pubmed:
11
6
2021
medline:
11
6
2021
Statut:
ppublish
Résumé
The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.
Identifiants
pubmed: 34110215
doi: 10.1103/PhysRevLett.126.201102
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM