Measurement of absolute energy scale of ECAL of DAMPE with geomagnetic rigidity cutoff

Zang, J.; Yue, Chuan; Li, Xiang

doi:10.22323/1.301.0197

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…A further check of the DPMJET model with the CRMC (39) interface gives negligible difference compared with the FLUKA model. Last, the uncertainties associated with the absolute energy scale are about 2% (40), which are not corrected in this work.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

An¹,

Asfandiyarov²,

Azzarello³

et al. 2019

Sci. Adv.

179

123

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The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic ray proton fluxes with kinetic energies from 40 GeV to 100 TeV, with 2 1 / 2 years of data recorded by the DArk Matter Particle Explorer (DAMPE). This is the first time that an experiment directly measures the cosmic ray protons up to~100 TeV with high statistics. The measured spectrum confirms the spectral hardening at~300 GeV found by previous experiments and reveals a softening at~13.6 TeV, with the spectral index changing from~2.60 to~2.85. Our result suggests the existence of a new spectral feature of cosmic rays at energies lower than the so-called knee and sheds new light on the origin of Galactic cosmic rays.

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Section: Systematic Uncertaintiesmentioning

confidence: 99%

Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

An¹,

Asfandiyarov²,

Azzarello³

et al. 2019

Sci. Adv.

179

123

View full text Add to dashboard Cite

show abstract

“…The absolute energy scale uncertainty constitutes another type of systematic uncertainty that will shift the spectrum up or down coherently, without changing spectral features of the flux. For DAMPE, the absolute energy scale is estimated to be ∼ 1.013 times higher 37 . Its small effect on the flux (i.e., scaled down by a factor of ∼ 2.6%) has not been corrected in this work.…”

mentioning

confidence: 98%

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

Ambrosi,

An,

Asfandiyarov

et al. 2017

Preprint

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High energy cosmic ray electrons plus positrons (CREs), which lose energy quickly during their propagation, provide an ideal probe of Galactic high-energy processes 1-7 and may enable the observation of phenomena such as dark-matter particle annihilation or decay [8][9][10] . The CRE spectrum has been directly measured up to ∼ 2 TeV in previous balloon-or spaceborne experiments [11][12][13][14][15][16] , and indirectly up to ∼ 5 TeV by ground-based Cherenkov γ-ray telescope arrays 17,18 . Evidence for a spectral break in the TeV energy range has been provided by indirect measurements of H.E.S.S. 17,18 , although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range 25 GeV − 4.6 TeV by the DArk Matter Particle Explorer (DAMPE) 19 with unprecedentedly high energy resolution and low background. The majority of the spectrum can be properly fitted by a smoothly broken power-law model rather than a single power-law model. The direct detection of a spectral break at E ∼ 0.9 TeV confirms the evidence found by H.E.S.S., clarifies the behavior of the CRE spectrum at energies above 1 TeV and sheds light on the physical origin of the sub-TeV CREs.

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“…As a consequence, the geomagnetic rigidity cutoff is much higher in the equatorial region, where the typical value is about a few tens of GeV, well in the sensitive energy range of the DAMPE. For comparison, we use the CREs fluxes near the geomagnetic equator in DAMPE orbit (Zang et al 2017), and the DAMPE measurement of the CREs fluxes above 1.2 times the rigidity cutoff is normalized to the fluxes published by AMS02 (Aguilar et al 2014).…”

Section: Primary and Secondary Cres Flux With Geomagnetic Rigidity Cu...mentioning

confidence: 99%

A Study on Monte Carlo simulation of the radiation environment above GeV at the DAMPE orbit

Wang,

Zang,

Jiang

et al. 2022

Preprint

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The Dark Matter Particle Explorer (DAMPE) has been undergoing a stable on-orbit operation for more than 6 years and acquired observation of over 11 billion events. And a better understanding of the overall radiation environment on the DAMPE orbit is crucial for both simulation data production and flight data analysis. In this work, we study the radiation environment at the low Earth orbit and develop a simulation software package using the framework of ATMNC3, in which state-of-the-art full 3D models of the Earth's atmospheric and magnetic-field configurations is integrated. We consider in our Monte Carlo procedure event-by-event propagation of the cosmic rays in the geomagnetic field and their interaction with the Earth's atmosphere, focusing on the particles above GeV that are able to trigger the DAMPE data acquisition system. We compare the simulation results with the cosmic-ray electrons and positrons (CREs) flux measurements made by DAMPE.The overall agreement on both the spectral and angular distribution of the CREs flux demonstrates that our simulation is well established. Our software package could be of more general usage for the simulation of the radiation environment at the low Earth orbit of various altitudes.

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Measurement of absolute energy scale of ECAL of DAMPE with geomagnetic rigidity cutoff

Cited by 10 publications

References 7 publications

Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

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

A Study on Monte Carlo simulation of the radiation environment above GeV at the DAMPE orbit

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