The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,China,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of...The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,China,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov detectors.Its objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational waves.This study aims to utilize the latest AI technology to enhance the sensitivity of HADAR experiments.Training datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various applications.These models can determine the type,energy,and direction of the incident particles after careful design.We obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.22°in a test dataset at 10 TeV.These findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical research.By using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and H.E.S.S.at energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher energies.In addition,our experiment offers a new approach for dealing with strongly connected,scattered data.展开更多
The nature of dark matter is one of the greatest mysteries in modern physics and astronomy.A wide variety of experiments have been carried out worldwide to search for the evidence of particle dark matter.Chinese physi...The nature of dark matter is one of the greatest mysteries in modern physics and astronomy.A wide variety of experiments have been carried out worldwide to search for the evidence of particle dark matter.Chinese physicists started experimental search for dark matter about ten years ago,and have produced results with high scientific impact.In this paper,we present an overview of the dark matter program in China,and discuss recent results and future directions.展开更多
文摘The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,China,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov detectors.Its objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational waves.This study aims to utilize the latest AI technology to enhance the sensitivity of HADAR experiments.Training datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various applications.These models can determine the type,energy,and direction of the incident particles after careful design.We obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.22°in a test dataset at 10 TeV.These findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical research.By using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and H.E.S.S.at energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher energies.In addition,our experiment offers a new approach for dealing with strongly connected,scattered data.
基金The authors thank Prof,Qian Yue and Dr.Litao Yang from Tsinghua University,and also appreciate Prof.Jin Chang frorm Purple Mountain Obeservatory for their generous help with the content of this paper.This work was supported in part by the Double First Class plan of the Shanghai Jiao Tong University,the Koy Laboratory for Particle Physics and Cosmology,Ministry of Education,and the Chinese Academy of Sciences Center for Ex-cellence in Particle Physics.We also thank supportse from the Na-tiounal Natural Selenee Foundaution of China,Ministry of Selenee and Technology,Ofice of Science and Technology,Shanghai Municipal Government,and the Hongkong Hongwen Foundation and Tencent Punlaliu in Chia.
文摘The nature of dark matter is one of the greatest mysteries in modern physics and astronomy.A wide variety of experiments have been carried out worldwide to search for the evidence of particle dark matter.Chinese physicists started experimental search for dark matter about ten years ago,and have produced results with high scientific impact.In this paper,we present an overview of the dark matter program in China,and discuss recent results and future directions.
