Advances in direct measurements of cosmic rays

Seo, E. S.

doi:10.1007/s40042-021-00081-7

Cited by 4 publications

(5 citation statements)

References 69 publications

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“…Common spectral features have recently been reported by multiple experiments across all primary particles. The Alpha-Magnetic Spectrometer (AMS-02), Cosmic Ray Energetics and Mass instrument (CREAM), CALorimetric Electron Telescope (CALET), and DArk Matter Particle Explorer (DAMPE) collaborations have all reported spectral hardening starting at ∼200 GV ( [2] and references therein). Such hardening is modeled as a transition from one accelerator to another, assuming a simple rigidity dependent acceleration limit, to fit the spectral change.…”

Section: Data Compiledmentioning

confidence: 99%

Cosmic Ray Elemental Spectra and Atmospheric Neutrino Fluxes

Scrandis¹,

Bowman²,

Seo³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Atmospheric neutrinos are produced when cosmic rays interact with Earth's atmosphere. The relationship between the cosmic ray spectrum and the neutrino spectrum is especially important around the cosmic ray all-particle knee. These energies correspond to the regime in which astrophysical neutrinos begin to dominate the neutrino flux, so accurate modeling of the cosmicray spectrum around the knee can be used to help separate background from signal. Currently, direct measurements of elemental spectra reach their upper energy limit just below the all-particle knee, requiring extrapolation in order to probe the transitional neutrino source energy regime. In this work, the cosmic ray knee is modeled as a transition between acceleration sources, each with a rigidity dependent acceleration limit. Cosmic-ray particles reach the limit at Z * E where Z is the particle charge and E is proton's limit. Utilizing the Matrix Cascade Equations code, cosmic-ray elemental spectra were used to calculate resulting atmospheric neutrino fluxes. Various parameterizations to model cosmic rays are explored, the effects of the resulting elemental spectra on the neutrino fluxes are investigated, and the neutrino results are compared to experimental data.

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Section: Data Compiledmentioning

confidence: 99%

Cosmic Ray Elemental Spectra and Atmospheric Neutrino Fluxes

Scrandis¹,

Bowman²,

Seo³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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“…We consider three cases to fit the hardening and find a case preferred by data. 8,9,10,11,12 Case 1 includes only a diffusion coefficient break. We add a break at 300 GV to have the diffusion coefficient index changes from 0.514 to 0.27 as shown in the blue cells in Table 1.…”

Section: Pos(icrc2021)155mentioning

confidence: 99%

Study Of Cosmic Ray Spectral Hardening Using GALPROP

Wu¹,

Seo²,

Птускин³

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Significant spectral hardening at around 200 GV magnetic rigidity has been reported by AMS-02, ATIC-2, CALET, CREAM, DAMPE, and PAMELA. This has been observed in high-accuracy measurements of various nuclei energy spectra of both primaries and secondaries. To explain the spectral hardening while maintaining proper B/C and p/He ratios, we study 3 approaches in a reacceleration model: adding a diffusion coefficient break, introducing extra source injection breaks, and a combination of both. We use the numerical code GALPROP to compute the propagation of cosmic rays with such parameter sets on the rigidity dependence of source and propagation parameters. Implications on the positron spectra are discussed.

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“…Recent space-based and balloon-borne experiments have shown various cosmic ray elemental spectra deviating from a single power law ( [1] and references therein). These deviations from a single power law are referred to as spectral features.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 3:The produced e − and e + spectra ([1] and references therein) from GALPROP v57 on the left and right, respectively. The coloring and line styles from Figure2denote the same information as well.…”

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confidence: 99%

Studies of Cosmic-Ray Propagation Using GALPROP

Chen,

Dorris,

Ptuskin

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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Recent space-based and balloon-borne experiments have shown various spectral features, including hardening of cosmic ray data at ~200 GeV/n in both primary and secondary elements, a positron excess above ~30 GeV, and a softening of the proton and helium spectrum at ~10 TV. The cause of these spectral features was investigated using GALPROP, a numerical cosmic-ray propagation code. The plain diffusion model with reacceleration and convection effects served as a baseline. Three cases were studied using rigidity-dependent parameters: a case with a diffusion coefficient break, a case with source spectrum breaks, and a case with a combination of both effects. An additional positron source was considered to describe this positron excess, and an additional proton and helium break was also considered to fit the softening of these spectra. Resulting elemental spectra and ratios are compared for the three cases. Implications of these spectral features are discussed.

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Advances in direct measurements of cosmic rays

Cited by 4 publications

References 69 publications

Cosmic Ray Elemental Spectra and Atmospheric Neutrino Fluxes

Cosmic Ray Elemental Spectra and Atmospheric Neutrino Fluxes

Study Of Cosmic Ray Spectral Hardening Using GALPROP

Studies of Cosmic-Ray Propagation Using GALPROP

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