Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.201102
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Funding
- strategic priority science and technology projects in space science of Chinese Academy of Sciences
- National Key Research and Development Program of China [2016YFA0400200]
- National Natural Science Foundation of China [11921003, 11622327, 12003076, 11722328, 11851305, U1738205, U1738206, U1738207, U1738208, U1738127]
- strategic priority science and technology projects of Chinese Academy of Sciences [XDA15051100]
- Young Elite Scientists Sponsorship Program by CAST [YESS20160196]
- Program for Innovative Talents and Entrepreneur in Jiangsu
- Swiss National Science Foundation (SNSF), Switzerland
- National Institute for Nuclear Physics (INFN), Italy
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [851103]
- European Research Council (ERC) [851103] Funding Source: European Research Council (ERC)
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This study reports the measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using data recorded by DAMPE over 4.5 years. It observed a spectrum hardening at about 1.3 TeV and a spectral softening at about 34 TeV, with a significant value of 4.3 sigma. The measurements suggest a particle charge dependent softening energy, although uncertainties do not rule out a dependence on the number of nucleons.
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 4.3 sigma. 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.
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