Yi Xing

Precise Measurement of the Cosmic Ray Helium Spectrum above 0.1 PeV

F Aharonian, D Bastieri, Weixin Bian, Liang Chen et autres

We report a measurement of the cosmic ray helium energy spectrum in the energy interval 0.16-13 PeV, derived by subtracting the proton spectrum from the light component (proton and helium) spectrum obtained with observations made by the Large High Altitude Air Shower …

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Competition between Glassy Five-Fold Structures and Locally Dense Packing Structures Governs Two-Stage Compaction of Granular Hexapods

Houfei Yuan, Yi Xing, Jiahao Liu, Wei Huang et autres

Using X-ray tomography, we experimentally investigate the structural evolution of packings composed of 3D-printed hexapod particles, each formed by three mutually orthogonal spherocylinders, during tap-induced compaction. We identify two distinct structural compaction mechanisms: an initial stage dominated by enhanced particle interlocking, which …

Multi-wavelength study of the flaring activity in BL Lacertae during its 2024 outburst

Guangman Xiang, Shicong Hu, S. Y. Fu, Dawei Xu et autres

On 5th October 2024, BL Lacertae exhibited extreme broadband activity. Fermi-LAT detected a flux increase by a factor of approximately 20 compared to the average flux reported in the Fourth Fermi-LAT Catalog. The LHAASO-WCDA real-time monitoring system was also triggered by a …

γ-Cygni supernova remnant in γ-rays: Signatures of trapped and escaped cosmic rays

Yuan Li, Gwenael Giacinti, Siming Liu, Yi Xing

We reanalyzed 15 years of data recorded by the Fermi Large Area Telescope in a region around supernova remnant (SNR) γ-Cygni from 100 MeV to 1 TeV. We found that the spectra of two extended sources associated with the southeast radio SNR …

Study of ultra-high-energy gamma-ray source 1LHAASO J0056+6346u and its possible origins

Zhen Cao, F. Aharonian, M Axikegu, Y. Bai et autres

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Morphology and energy distribution characteristics of ultra-high frequency adjustable multi-pulse GTAW arc

Hongyan Zhao, Yi Xing, Jingzhang Zhang, Shujun Chen et autres

cn (code pays fourni par la source)

A flaring radio counterpart to a fast radio burst reveals a newborn magnetized engine

Xian Zhang, Wenfei Yu, Zhen Yan, Yi Xing et autres

Fast Radio Bursts (FRBs) are energetic millisecond radio bursts at cosmological distances, whose underlying engine is not identified. Among a sub-population that emit repeated radio bursts, a handful were associated with a persistent radio source (PRS) whose origin is unknown. Here we …

Proof of Shock-cloud interaction within parts of $γ$-Cygni region

Yuan Li, Gwenael Giacinti, Siming Liu, Yi Xing

We reanalyze 15 yr data recorded by the Fermi Large Area Telescope in a region around supernova remnant (SNR) $γ$-Cygni from 100 MeV to 1 TeV, and find that the spectra of two extended sources associated with the southeast radio SNR arc …

Flaring gamma-ray emission coincident with a hyperactive fast radio burst source

Yi Xing, Wenfei Yu, Zhen Yan, Xian Zhang et autres

Fast radio bursts (FRBs) are bright milliseconds-duration radio bursts from cosmological distances. Despite intense observational and theoretical studies, their physical origin is still mysterious. One major obstacle is the lack of identification of multi-wavelength counterparts for FRBs at cosmological distances. So far, …

A Real-time Monitor for TeV Gamma-Ray Flare with the LHAASO-WCDA Detector

Guangman Xiang, M. Zha, J. N. Zhou, Yi Xing

Abstract With its high duty cycle, wide field of view and high detection sensitivity, Water Chereknov Detector Array as one of sub-arrays of Large High Altitude Air Shower Observatory is a promising facility to monitor transient phenomena in the very high energy …

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Transient characteristics of ultra-high frequency adjustable multi-pulse gas tungsten welding arc

Hongyan Zhao, Yi Xing, Jingzhang Zhang, Yue Yu et autres

In response to the shortcomings of traditional Gas Tungsten Arc Welding (GTAW), such as low penetration, slow welding speed, and low production efficiency, an Ultra-High-Frequency Adjustable Multi-Pulse Gas Tungsten Arc Welding (UFMP-GTAW) process is proposed. This process more effectively concentrates the temperature …

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Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO

Zhen Cao, F. Aharonian, Axikegu, Y. W. Bao et autres

Abstract The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported the detection of a very high energy gamma-ray source, 1LHAASO J1219+2915. This Letter presents a further detailed study of the spectral and temporal behavior of this pointlike …

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