Recent Progresses of the DAMPE Mission

CHANG Jin

doi:10.11728/cjss2024.04.2024-yg11

Recent Progresses of the DAMPE Mission

doi: 10.11728/cjss2024.04.2024-yg11 cstr: 32142.14.cjss2024.04.2024-yg11

CHANG Jin

Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033
School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026

Funds: Supported by the National Key Research and Development Program of China (2016 YFA0400200), and the National Natural Science Foundation of China (U1738205, U1738206)

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Author Bio:
Male, born in 1966, chair scientist of the DArk Matter Particle Explorer (DAMPE, also called as “WuKong”) project. He has long been engaged in the detections and researches of gamma ray emission and high energy charged particles that come from outer space. E-mail: chang@pmo.ac.cn

摘要

Abstract: The DArk Matter Particle Explorer (DAMPE) is a space high-energy particle and γ-ray detector whose major scientific goals are the indirect detection of dark matter particles, the origin of cosmic rays and high-energy γ-ray astronomy. Since its successful launch in December 2015, the DAMPE has been operated smoothly in orbit for more than 8 years. The direct measurements of the boron-to-carbon and boron-to-oxygen flux ratios, and the proton+ Helium spectrum up to 316 TeV have been obtained, revealing new spectral features with very high significances. The search results of γ-ray spectral line and fractionally charged particles indicate a good potential of DAMPE for indirect dark matter detection and new physical discovery in space. The DAMPE measurements are expected to significantly advance our understanding of the fundamental problems in astroparticle physics.
- DAMPE /
- Dark matter /
- Indirect detection /
- Cosmic rays

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Figure 1. Schematic plot of the DAMPE detectors

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Figure 2. Charge spectrum obtained using two years of on-orbit data

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Figure 3. Ratios of energies reconstructed with P- and N-side data

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Figure 4. Boron-to-carbon (a) and boron-to-oxygen (b) flux ratios as functions of kinetic energy per nucleon measured by DAMPE^[35] (red filled dots), compared with measurements from other experiments^[37–44]

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Figure 5. (a) Shower spread versus the last layer energy fraction for selected events with BGO energies between 500 GeV and 1 TeV. (b) One-dimensional distributions of the shape parameter ζ, compared with MC simulations

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Figure 6. P+He spectrum from 46 GeV to 316 TeV measured by DAMPE^[45] (red fill dots), compared with direct measurements of p+He made by ATIC-02^[48], NUCLEON^[49] and CREAM^[50] (a), and indirect measurements from ARGO-YBJ+WFCT^[51], HAWC^[52], KASCADE^[53] and EAS-TOP+MACRO^[54] (b)

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Figure 7. (a) Distribution of PSD-STK charge for the on-orbit data of DAMPE, the red lines indicate the signal region for FCPs. (b) FCP flux upper limit of DAMPE^[55] (red dots), compared with the other space experiments^[56,57] and underground experiments^[58–62]

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Figure 8. 95% CL constraints for different DM density profiles with the DAMPE experiment^[63]. Blue dot-dashed lines show the 5.8-year Fermi-LAT constraints^[64]

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Figure 9. Significant point sources (TS≥25) detected in 7.2-year DAMPE data^[65]. Markers present the types of the associated sources. The numbers of different source types are listed in the right table

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Figure 10. Preliminary spectral measurement of the Galactic center excess (GCE) by DAMPE (a) and the preferred DM parameter space for the annihilation channel $ {\chi }{\chi }\to b\bar{b} $ (b)^[68]

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Table 1. Expected performance of DAMPE

Parameter	Value
Energy range (e/γ)	5 GeV to 10 TeV
Energy resolution (e/γ)	1.5% at 800 GeV
Energy range (p)	50 GeV to 500 TeV
Energy resolution (p)	40% at 800 GeV
Effective area (vertical γ)	1100 cm² at 100 GeV
Geometry factor (e)	0.3 m²·sr above 30 GeV
Angular resolution (γ)	0.1º at 100 GeV
Field of view	1.0 sr

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