Z. T. Shen

University of Science and Technology of China

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Jinglai Duan

Chinese Academy of Sciences

M. N. Mazziotta

Istituto Nazionale di Fisica Nucleare, Sezione di Bari

A. Tykhonov

University of Geneva

Y. F. Wang

University of Science and Technology of China

David Droz

University of Geneva

Giacinto Donvito

University of Science and Technology of China

K. K. Duan

Purple Mountain Observatory

P. Fusco

Istituto Nazionale di Fisica Nucleare, Sezione di Bari

G. Marsella

University of Palermo

Xueyi Teng

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

220

University of Science and Technology of China

139

Purple Mountain Observatory

110

Campbell Collaboration

University of Chinese Academy of Sciences

Institute of High Energy Physics

Istituto Nazionale di Fisica Nucleare

Institute of Modern Physics

University of Geneva

National Space Science Center

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Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission

Physical Review Letters (2021)

Francesco Alemanno Q. An P. Azzarello Felicia Barbato P. Bernardini

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.Received 5 January 2021Revised 25 March 2021Accepted 6 April 2021DOI:https://doi.org/10.1103/PhysRevLett.126.201102© 2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmic ray & astroparticle detectorsCosmic ray composition & spectraParticle astrophysicsGravitation, Cosmology & Astrophysics

Energy spectrum

10.1103/physrevlett.126.201102

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Citations (123)

Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons

Nature (2017)

G. Ambrosi Qi An R. Asfandiyarov P. Azzarello P. Bernardini

Annihilation

10.1038/nature24475

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Citations (489)

Search for relativistic fractionally charged particles in space

Physical review. D/Physical review. D. (2022)

Francesco Alemanno Corrado Altomare Q. An P. Azzarello Felicia Barbato

More than a century after the performance of the oil drop experiment, the possible existence of fractionally charged particles FCP still remains unsettled. The search for FCPs is crucial for some extensions of the Standard Model in particle physics. Most of the previously conducted searches for FCPs in cosmic rays were based on experiments underground or at high altitudes. However, there have been few searches for FCPs in cosmic rays carried out in orbit other than AMS-01 flown by a space shuttle and BESS by a balloon at the top of the atmosphere. In this study, we conduct an FCP search in space based on on-orbit data obtained using the DArk Matter Particle Explorer (DAMPE) satellite over a period of five years. Unlike underground experiments, which require an FCP energy of the order of hundreds of GeV, our FCP search starts at only a few GeV. An upper limit of $6.2\times 10^{-10}~~\mathrm{cm^{-2}sr^{-1} s^{-1}}$ is obtained for the flux. Our results demonstrate that DAMPE exhibits higher sensitivity than experiments of similar types by three orders of magnitude that more stringently restricts the conditions for the existence of FCP in primary cosmic rays.

Orbit (dynamics)

Particle (ecology)

10.1103/physrevd.106.063026

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Measurement of the cosmic p+He energy spectrum from 50 GeV to 0.5 PeV with the DAMPE space mission

Physical review. D/Physical review. D. (2024)

Francesco Alemanno Corrado Altomare Q. An P. Azzarello Felicia Barbato

Recent observations of the light component of the cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to the highest energies. The Dark Matter Particle Explorer is a satellite-based cosmic-ray experiment that has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, and particle identification capabilities. In this work, the latest measurements of the energy spectrum of proton+helium in the energy range from 46 GeV to 464 TeV are presented. Among the most distinctive features of the spectrum, a spectral hardening at 600 GeV has been observed, along with a softening at 29 TeV measured with a 6.6σ significance. Moreover, the detector features and the analysis approach allowed for the extension of the spectral measurement up to the sub-PeV region. Even if with small statistical significance due to the low number of events, data suggest a new spectral hardening at about 150 TeV.Received 31 March 2023Revised 27 October 2023Accepted 17 May 2024DOI:https://doi.org/10.1103/PhysRevD.109.L121101© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmic ray accelerationCosmic ray composition & spectraCosmic ray propagationCosmic ray sourcesCosmic rays & astroparticlesGravitation, Cosmology & Astrophysics

10.1103/physrevd.109.l121101

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Citations (5)

Measurement of the cosmic p+He energy spectrum from 46 GeV to 316 TeV with the DAMPE space mission

arXiv (Cornell University) (2023)

DAMPE Collaboration Francesco Alemanno Corrado Altomare Q. An P. Azzarello

Recent observations of the light component of the cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to the highest energies. The Dark Matter Particle Explorer is a satellite-based cosmic-ray experiment that has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, and particle identification capabilities. In this work, the latest measurements of the energy spectrum of proton+helium in the energy range from 46 GeV to 464 TeV are presented. Among the most distinctive features of the spectrum, a spectral hardening at 600 GeV has been observed, along with a softening at 29 TeV measured with a 6.6{\sigma} significance. Moreover, the detector features and the analysis approach allowed for the extension of the spectral measurement up to the sub-PeV region. Even if with small statistical significance due to the low number of events, data suggest a new spectral hardening at about 150 TeV.

Energy spectrum

Sigma

10.48550/arxiv.2304.00137

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Citations (7)