检索结果-内蒙古大学图书馆

38th International Cosmic Ray Conference, ICRC 2023

作者： Xi, Shaoqiang Chen, Songzhan Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China TIANFU Cosmic Ray Research Center Sichuan Chengdu China

We present the first LHAASO catalog of -ray sources with energies above 25 TeV. The catalog covers the northern -ray sky from declination −20◦ to 80◦, and it is based on data collected by the LHAASO 1 km2 array (LHAASO-KM2A) from January 2020 to September 2022. It represents the most sensitive survey of these sources in this energy range, including 75 detections with an extended size of less than 2◦. Among them, 43 sources have been detected with ultra-high energy (>100 TeV) emissions with a significance level higher than 4 (TS > 25). The position, extension and power-law spectral characteristics of each source are reported. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Tellurium compounds

来源：评论

学校读者我要写书评

暂无评论

Study the measurement of air depth of shower maximum for cosmic rays by LHAASO-WFCTA 38

Study the measurement of air depth of shower maximum for cos...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Ma, Lingling Wang, Liping Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

According to the superposition model, the air depth at which the shower size reaches its maximum (Xmax ) is sensitive to the mass compositions of cosmic rays, so Xmax can be used to identify the mass compositions and measure the average mean logarithm mass of cosmic rays. The Wide Field of view Cherenkov Telescope Array (WFCTA) as an important part of Large High Altitude Air Shower Observatory can record the Cherenkov images which can be used to reconstruct Xmax. The angular distance (Dist ) between the arriving direction and the gravity center of the Cherenkov image is related to Xmax. In this work, the method of the Xmax reconstruction is studied by simulation data, and 20g/cm2 resolution of Xmax can be achieved. The ability of the reconstructed Xmax in mass composition identification and the measurement of the mean logarithm mass is also studied. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

来源：评论

学校读者我要写书评

暂无评论

The research on the measurement of water quality based on reflection cavity 38

The research on the measurement of water quality based on re...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Tang, Yiyue Chen, Xinxin Zhang, Juntao Zhang, Qinghong Li, Xiurong Zhu, Fengrong Chen, Long School of Physical Science and Technology Southwest Jiaotong University Sichuan Province Chengdu611756 China Key Laboratory of Particle Astrophyics Experimental Physics Division Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

The passage of high-energy particles through water, air, and some other similar media produces Cherenkov light. Cherenkov detectors are widely used for detecting primary high-energy cosmic rays or gamma rays. The quality of the media is important for the experiments because the contaminants can absorb the light and reduce the precision of the reconstruction of the extensive air showers. Here we developed a method, similar to the integrating ring-down spectroscopy for evaluating the water quality. This method induced the laser as light source, the bucket with high reflective diffused material in the inner wall to reflect the light, photomultiplier tube (PMT) to record the waveform of light signal. We choose copper sulfate solution to find the relationship between solution concentration, the attenuation length of water, and the reflectivity of inner-wall material. The results proved the feasibility of the reflection cavity. This method can also be applied on the monitor of atmosphere, water pollution and cave safety, etc. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic ray detectors

来源：评论

学校读者我要写书评

暂无评论

Search for very high energy gamma-ray bursts based on LHAASO-WCDA triggered data 38

Search for very high energy gamma-ray bursts based on LHAASO...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Huang, Y. Liu, C. Yao, Z.G. Key Laboratory of Particle Astrophyics Experimental Physics Division Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu610000 China

Water Cherenkov Detector Array (WCDA), a part of Large High Altitude Air Shower Observatory(LHAASO), is a very sensitive gamma source detector in hundreds GeV to dozens TeV due to its effectvie gamma-proton discriminating capability. Triggered data is always preserved for long term, which makes long time analysis for gamma-ray bursts (GRBs) possible. Based on LHAASO-WCDA triggerd data, we searched GRB signal using location and corresponding time extracted from GCN website if GRB bursts in view from March 5, 2021 to February 1, 2023 manually. Alert automatic analysis program is deployed in April, 2023, which will give analysis results within 2 days automatically. Trial number is considered to avoiding misjudging. In this contribution we will introduce searching strategy, alert automatic analysis workflow and present the total searching results. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic ray detectors

来源：评论

学校读者我要写书评

暂无评论

Proposal for the High Energy Neutrino Telescope 38

Proposal for the High Energy Neutrino Telescope

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Huang, Tian-Qi Cao, Zhen Chen, Mingjun Liu, Jiali Wang, Zike You, Xiaohao Qi, Ying Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu610000 China University of Chinese Academy of Sciences Beijing100049 China

The Large High Altitude Air Shower Observatory (LHAASO) has observed tens of gamma-ray sources with significant emission above 100 TeV. These gamma-ray sources are probably the Galactic accelerators of PeV cosmic-rays. Thus, high energy neutrinos above 100 TeV are expected to be observed from these PeVatron candidates. We propose the Huge Underwater high-energy Neutrino Telescope (HUNT) with instrumented volume up to 30 km3 to search for neutrino sources above 100 TeV, which will help us to identify the PeVatrons in our Galaxy and understand the acceleration of PeV cosmic-rays in the deep universe. Here, we present some preliminary results of the telescope simulation, the performance evaluation and the pathfinder experiment. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

来源：评论

学校读者我要写书评

暂无评论

The First LHAASO Catalog of Gamma-ray Sources below 25TeV 38

The First LHAASO Catalog of Gamma-ray Sources below 25TeV

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Hu, S.C. Xiang, G.M. Zha, M. Yao, Z.G. Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu610000 China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China

We report the first catalog of TeV gamma-ray sources realized with the most sensitive wide field-of-view TeV telescope ever built. Since March 2021, it continuously surveys the northern sky with field of view ∼ 2 sr and >90% duty cycle. Using 508 days data collected by full array of LHAASO-WCDA, 69 sources were detected significantly, including 5 extra-galactic sources. 19 of these sources have no known TeV counterpart within 0.5 degree. In this paper, detailed analysis will be presented including background estimation, searching strategy and summary of the catalog. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Galaxies

来源：评论

学校读者我要写书评

暂无评论

Automatic detection device for the absorption length of water measured by reflection cavity 38

Automatic detection device for the absorption length of wate...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Chen, Xinxin Tang, Yiyue Zhang, Juntao Chen, Long Li, Xiurong Zhu, Fengrong School of Physical Science and Technology Southwest Jiaotong University Sichuan Province Chengdu610031 China Key Laboratory of Particle Astrophysics Experimental Physics Division Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

Water serves as a key medium for the water Cherenkov detector, and the water absorption length significantly affects the efficiency of the detectors. The water absorption length represents the distance traveled by 1/e of light intensity attenuation due to the absorption of photons in water, representing the cleanliness of the water. It is a great challenge to measure or monitor the water attenuation length accurately at home and abroad. A method, like the integrating cavity ring-down spectroscopy is described in this paper, which could reveal the water absorption length and the reflectivity of the material at the same time. Based on it, an automatic detection device was designed and installed. A cylindrical cavity covered with highly reflective materials on the inner wall was employed to load the water. A cover is designed which can be controlled by a stepper motor to change the depth of water in the reflective chamber by moving the position of the cover, and at the same time sealing the reflective chamber by using the variable air pressure of the tires. The light provided by a pulse-twinkled LED was injected into the cavity, and the data was recorded by a fast photomultiplier tube(PMT). Finally, the collected waveforms of PMT at different water depths of the cavity were analyzed to get the absorption length of water and the reflectivity of the inner wall. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Stepping motors

来源：评论

学校读者我要写书评

暂无评论

Discovery of the Ultra-High-Energy gamma-ray source LHAASO J2002+3238 spatially associated with SNR G69.7+1.0 38

Discovery of the Ultra-High-Energy gamma-ray source LHAASO J...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Hou, B.W. Zhang, R. Xi, S.Q. Chen, S.Z. He, H.N. Xia, Z.Q. Key Laboratory of Particle Astrophyics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu610000 China University of Science and Technology of China Hefei230026 China Key Laboratory of Dark Matter and Space Astronomy Key Laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China

The origin of Galactic PeV cosmic rays is still under debate. Shell-type supernova remnants (SNRs) are proposed to be one of the candidate sources of Galactic PeV cosmic rays, but observational evidence is lacking. Here we report LHAASO’s detection on a point source J2002+3238 with a significance of 5.8 sigma above 25 TeV and 6.8 sigma above 100 TeV. The spectrum is consistent with a power-law spectrum with no cutoff. Inside the error region of the source, a shell-type SNR G69.7+1.0 is found locating only 0.07◦away from the best-fit location of the source, suggesting a strong association between the UHE gamma-ray source and the SNR. This provides strong evidence on SNRs as possible PeV accelerators. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

来源：评论

学校读者我要写书评

暂无评论

Hourly measurement of cosmic ray anisotropy by LHAASO WCDA at ∼1 TeV: Effects of an interplanetary flux rope during 2021 November 38

Hourly measurement of cosmic ray anisotropy by LHAASO WCDA a...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Koennonkok, Kritsanon Ruffolo, David Mitthumsiri, Warit Liu, Wei Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu610000 China

Interplanetary coronal mass ejections (ICMEs) are known to affect the intensity and anisotropy of Galactic cosmic rays of energies up to ∼100 GeV, but effects at higher energies have rarely been reported. Here we analyze data from the Large High Altitude Air Shower Observatory (LHAASO), and in particular its Water Cherenkov Detector Array (WCDA), which has been in full operation since March 2021. WCDA is sensitive to primary cosmic rays above about 100 GeV with a wide field of view (FOV), from which we select events within 45 degrees of the zenith. We normalize cosmic ray skymaps relative to a monthly average. Then for each hour of data, we express the cosmic ray anisotropy as the gradient of the excess cosmic ray rate over the FOV. For the ICME passage of 2021 Nov 4-5, a strong anisotropy was recently reported in data from muon detectors and neutron monitors. We present evidence for an enhanced anisotropy in LHAASO-WCDA data during that time period, for primary cosmic ray energy ranges both below and above 1 TeV. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic ray detectors

来源：评论

学校读者我要写书评

暂无评论

A compensation circuit for the gain temperature drift of silicon photomultiplier tube

引用

Radiation Detection Technology and Methods 2023年第4期7卷 571-577页

作者： Chang-ge Zi Jin-fan Chang Ming-jie Yang Feng-fan Yang Yu-Sheng Wang Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Particle Detection and Electronics of China Beijing100049China Key Laboratory of Particle Astrophysics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China TIANFU Cosmic Ray Research Center Chengdu610213SichuanChina

Background Silicon photomultiplier tube(SiPM)has been widely applied in high energy physics *** wide field of view Cherenkov telescope array of Large High Altitude Air Shower Observatory(LHAASO)consists of 12 arrays of *** of the array includes 32*32 *** Array of imaging atmospheric Cherenkov Telescopes(LACT),the next generation of particle astrophysics experiment,will also adopt SiPM *** LACT will located at a high altitude,leading to a significant operating temperature variation of the *** the gain of SiPM is temperature-sensitive,in order to keep it stable,compensation for the gain is necessary by adjusting the bias voltage of *** The compensation circuit provides the bias voltage of SiPM by using a high-voltage output Digital-to-Analog Converter and several high-voltage output *** reduce the temperature drift of the gain,the compensation circuit adjust the bias voltage of SiPM according to the operating *** The compensation circuit supplies SiPM with an adjustable bias voltage from 0 to 80 V,and the adjustment step is 1.22 *** the output voltage of the compensation circuit is 64 V,the voltage ripple is 2.59 mV,and the temperature drift is 0.17 mV/℃.In the temperature range from−20 to 30℃,the compensation circuit reduces the gain temperature drift of SiPM to within 2%.

关键词： SiPM Gain Compensation LACT

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：