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672 results on '"Xu, Y. B."'

1. Evidence of mini-jet emission in a large emission zone from a magnetically-dominated gamma-ray burst jet

Author

Yi, S. -X., Wang, C. -W., Shao, X. -Y., Moradi, R., Gao, H., Zhang, B., Xiong, S. -L., Zhang, S. -N., Tan, W. -J., Liu, J. -C., Xue, W. -C., Zhang, Y. -Q., Zheng, C., Wang, Y., Zhang, P., An, Z. -H., Cai, C., Feng, P. -Y., Gong, K., Guo, D. -Y., Huang, Y., Li, B., Li, X. -B., Li, X. -Q., Liu, X. -J., Liu, Y. -Q., Ma, X., Peng, W. -X., Qiao, R., Song, L. -M., Wang, J., Wang, P., Wen, X. -Y., Xiao, S., Xu, Y. -B., Yang, S., Yi, Q. -B., Zhang, D. -L., Zhang, F., Zhang, H. -M., Zhang, J. -P., Zhang, Z., Zhao, X. -Y., Zhao, Y., and Zheng, S. -J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The second brightest GRB in history, GRB230307A provides an ideal laboratory to study the details of GRB prompt emission thanks to its extraordinarily high photon statistics and its single broad pulse overall shape characterized by an energy-dependent fast-rise-exponential-decay (FRED) profile. Here we demonstrate that its broad pulse is composed of many rapidly variable short pulses, rather than being the superposition of many short pulses on top of a slow component. Such a feature is consistent with the picture of many mini-jets due to local magnetic reconnection events in a large emission zone far from the GRB central engine, as envisaged in the internal-collision-induced magnetic reconnection and turbulence (ICMART) model, but raises a great challenge to the internal shock models that attribute all variability components to collisions among different shells. Since relativistic mini-jets demand strong magnetization in the outflow, this work provides strong evidence for a Poynting-flux-dominated jet composition of this bright GRB., Comment: 7 pages and 2 figures in the main text. 27 pages and 9 figures in total

Published
2023

2. The First GECAM Observation Results on Terrestrial Gamma-ray Flashes and Terrestrial Electron Beams

Author

Zhao, Y., Liu, J. C., Xiong, S. L., Xue, W. C., Yi, Q. B., Lu, G. P., Xu, W., Lyu, F. C., Sun, J. C., Peng, W. X., Zheng, C., Zhang, Y. Q., Cai, C., Xiao, S., Xie, S. L., Wang, C. W., Tan, W. J., An, Z. H., Chen, G., Du, Y. Q., Huang, Y., Gao, M., Gong, K., Guo, D. Y., He, J. J., Li, B., Li, G., Li, X. Q., Li, X. B., Liao, J. Y., Liang, J., Liang, X. H., Liu, Y. Q., Ma, X., Qiao, R., Song, L. M., Song, X. Y., Sun, X. L., Wang, J., Wang, J. Z., Wang, P., Wen, X. Y., Wu, H., Xu, Y. B., Yang, S., Zhang, B. X., Zhang, D. L., Zhang, F., Zhang, P., Zhang, H. M., Zhang, Z., Zhao, X. Y., Zheng, S. J., Zhang, K. K., Han, X. B., Wu, H. Y., Hu, T., Geng, H., Zhang, H. B., Lu, F. J., Zhang, S. N., and Yu, H.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a space-borne instrument dedicated to monitoring high-energy transients, including Terrestrial Gamma-ray Flashes (TGFs) and Terrestrial Electron Beams (TEBs). We implemented a TGF/TEB search algorithm for GECAM, with which 147 bright TGFs, 2 typical TEBs and 2 special TEB-like events are identified during an effective observation time of $\sim$9 months. We show that, with gamma-ray and charged particle detectors, GECAM can effectively identify and distinguish TGFs and TEBs, and measure their temporal and spectral properties in detail. A very high TGF-lightning association rate of $\sim$80\% is obtained between GECAM and GLD360 in east Asia region., Comment: The paper was accepted by Geophysical Research Letters on June 16th, 2023

Published
2023
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4. The Design and Performance of Charged Particle Detector onboard the GECAM Mission

Author

Xu, Y. B., Sun, X. L., Yang, S., Li, X. Q., Peng, W. X., Gong, K., Liang, X. H., Liu, Y. Q., Guo, D. Y., Wang, H., Li, C. Y., An, Z. H., He, J. J., Liu, X. J., Xiong, S. L., Wen, X. Y., Zhang, Fan, Zhang, D. L., Zhao, X. Y., Zhang, C. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Hou, D. J., Li, Y. G., Li, G., Li, L., Li, X. F., Li, M. S., Lu, F. J., Lu, H., Meng, B., Shi, F., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xu, Y. P., Yang, J. W., Yi, Q. B., Zhang, S. N., Zhang, C. M., Zhang, Fei, Zhao, Y., and Zhou, X.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The Gravitational Wave highly energetic Electromagnetic Counterpart All-sky Monitor (GECAM) is dedicated to detecting gravitational wave gamma-ray bursts. It is capable of all-sky monitoring over and discovering gamma-ray bursts and new radiation phenomena. GECAM consists of two microsatellites, each equipped with 8 charged particle detectors (CPDs) and 25 gamma-ray detectors (GRDs). The CPD is used to measure charged particles in the space environment, monitor energy and flow intensity changes, and identify between gamma-ray bursts and space charged particle events in conjunction with GRD. CPD uses plastic scintillator as the sensitive material for detection, silicon photomultiplier (SiPM) array as the optically readable device, and the inlaid Am-241 radioactive source as the onboard calibration means. In this paper, we will present the working principle, physical design, functional implementation and preliminary performance test results of the CPD., Comment: accepted to RDTM

Published
2021

5. GECAM detection of a bright type-I X-ray burst from 4U 0614+09: confirmation its spin frequency at 413 Hz

Author

Chen, Y. P., Li, J., Xiong, S. L., Ji, L., Zhang, S., Peng, W. X., Qiao, R., Li, X. Q., Wen, X. Y., Song, L. M., Zheng, S. J., Song, X. Y., Zhao, X. Y., Huang, Y., Lu, F. J., Zhang, S. N., Xiao, S., Cai, C., Zhang, B. X., An, Z. H., Chen, C., Chen, G., Chen, W., Dai, G. Q., Du, Y. Q., Gao, M., Gong, K., Guo, D. Y., Guo, Z. W., He, J. J., Li, B., Li, C., Li, C. Y., Li, G., Li, J. H., Li, L., Li, Q. X., Li, X. B., Li, Y. G., Liang, J., Liang, X. H., Liao, J. Y., Liu, J. C., Liu, X. J., Liu, Y. Q., Luo, Q., Ma, X., Meng, B., Ou, G., Shi, D. L., Shi, F., Shi, J. Y., Sun, G. X., Sun, X. L., Tuo, Y. L., Wang, C. W., Wang, H., Wang, H. Y., Wang, J., Wang, J. Z., Wang, P., Wang, Y. S., Wang, Y. X., Wen, X., Wu, H., Xie, S. L., Xu, Y. B., Xu, Y. P., Xue, W. C., Yang, S., Yao, M., Ye, J. Y., Yi, Q. B., Zhang, C. M., Zhang, C. Y., Zhang, D. L., Zhang, Fan, Zhang, Fei, Zhang, H. M., Zhang, K., Zhang, P., Zhang, X. L., Zhang, Y. Q., Zhang, Z., Zhao, G. Y., Zhao, S. Y., Zhao, Y., Zheng, C., Zhou, X., and Zhu, Y.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

One month after launching Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM), a bright thermonuclear X-ray burst from 4U~0614+09, was observed on January 24, 2021. We report the time-resolved spectroscopy of the burst and a burst oscillation detection at 413 Hz with a fractional amplitude 3.4\% (rms). This coincides with the burst oscillation previously discovered with \textit{Swift}/BAT \citep{Strohmayer2008}, and therefore confirms the spin frequency of this source. This burst is the brightest one in the normal bursts (except the superburst) ever detected from 4U~0614+09, which leads to an upper limit of distance estimation as 3.1 kpc. The folded light curve during the burst oscillation shows a multi-peak structure, which is the first case observed during a single burst oscillation in nonpulsating sources. The multi-peak profile could be due to additional harmonics of the burst oscillation, which is corresponding to several brighter/fainter spots at the stellar surface.

Published
2021
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6. The SiPM Array Data Acquisition Algorithm Applied to the GECAM Satellite Payload

Author

Liu, Y. Q., Gong, K., Li, X. Q., Wen, X. Y., An, Z. H., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Sun, X. L., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Yi, Q. B., Zhang, Fan., Zhang, D. L., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., Zhao, Y., and Zhou, X.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

The Gravitational Wave Burst High-energy Electromagnetic Counterpart All-sky Monitor (GECAM), consists of 2 small satellites that each contain 25 LaBr3 (lanthanum bromide doped with cerium chloride) detectors and 8 plastic scintillator detectors. The detector signals are read out using a silicon photomultiplier (SiPM) array. In this study, an acquisition algorithm for in-orbit real-time SiPM array data is designed and implemented, and the output event packet is defined. Finally, the algorithm's efficacy for event acquisition is verified.

Published
2021

7. Ground-based calibration and characterization of GRD of GECAM: 8-160 keV

Author

He, J. J., An, Z. H., Peng, W. X., Li, X. Q., Xiong, S. L., Zhang, D. L., Qiao, R., Guo, D. Y., Cai, C., Chang, Z., Chen, C., Chen, G., Du, Y. Y., Gao, M., Gao, R., Gong, K., Hou, D. J., Li, C. Y., Li, G., Li, L., Li, M. S., Li, X. B., Li, X. F., Li, Y. G., Liang, X. H., Liu, J. C., Liu, X. J., Liu, Y. Q., Lu, H., Ma, X., Meng, B., Shi, F., Song, L. M., Sun, X. L., Wang, C. W., Wang, H., Wang, H. Z., Wang, J. Z., Wang, Y. S., Wen, X., Wen, X. Y., Xiao, S., Xu, Y. B., Xu, Y. P., Xue, W. C., Yang, J. W., Yang, S., Yi, Q. B., Zhang, C. M., Zhang, C. Y., Zhang, Fan, Zhang, Fei, Zhang, P., Zhang, S. N., Zhang, Y. Q., Zhao, X. Y., Zhao, Y., Zheng, C., Zheng, S. J., Zhou, X., and Zhu, Y.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

As the main detector of the GECAM satellite, the calibration of the energy response and detection efficiency of the GRD detector is the main content of the ground-based calibration. The calibration goal requires the calibrated energy points to sample the full energy range (8 keV-2 MeV) as much as possible. The low energy band (8-160 keV) is calibrated with the X-ray beam, while the high energy band (>160 keV) with radioactive sources. This article mainly focuses on the calibration of the energy response and detection efficiency in the 8-160 keV with a refined measurement around the absorption edges of the lanthanum bromide crystal. The GRD performances for different crystal types, data acquisition modes, working modes, and incident positions are also analyzed in detail. We show that the calibration campaign is comprehensive, and the calibration results are generally consistent with simulations as expected., Comment: 16 pages,46 figures

Published
2021

8. The design and performance of GRD onboard the GECAM satellite

Author

An, Z. H., Sun, X. L., Zhang, D. L., Yang, S., Li, X. Q., Wen, X. Y., Gong, K., Liang, X. H., Liu, X. J., Liu, Y. Q., Li, Y. G., Xiong, S. L., Xu, Y. B., Zhang, Fan, Zhao, X. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Feng, P. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xu, Y. P., Yang, J. W., Yi, Q. B., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, Y., and Zhou, X.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Background: Each GECAM satellite payload contains 25 gamma-ray detectors (GRDs), which can detect gamma-rays and particles and can roughly localize the Gamma-Ray Bursts (GRBs). GRD was designed using lanthanum bromide (LaBr3) crystal as the sensitive material with the rear end coupled with silicon photomultiplier (SiPM) array for readout. Purpose: In aerospace engineering design of GRD, there are many key points to be studied. In this paper, we present the specific design scheme of GRD, the assembly and the performance test results of detectors. Methods: Based on Monte Carlo simulation and experimental test results, the specific schematic design and assembling process ofGRDwere optimized. After being fully assembled, theGRDswere conducted performance tests by using radioactive source and also conducted random vibration tests. Result and conclusion: The test results show that all satellite-borne GRDs have energy resolution <16% at 59.5 keV, meeting requirements of satellite in scientific performance. The random vibration test shows that GRD can maintain in a stable performance, which meets the requirement of spatial application., Comment: 10 pages, 15 figures

Published
2021
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9. Inflight performance of the GECAM Gamma-ray and Charge particle Detectors

Author

Li, X. Q., Wen, X. Y., Xiong, S. L., Gong, K., Zhang, D. L., An, Z. H., Xu, Y. B., Liu, Y. Q., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C., Li, C. Y., Li, G., Li, L., Li, Q. X., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Lu, F. J., Lu, H., Ma, X., Meng, B., Peng, W. X., Qiao, R., Shi, F., Song, L. M., Sun, X. L., Wang, H., Wang, H. Z., Wang, J. Z., Wang, P., Wang, Y. S., Wen, X., Xiao, S., Xu, Y. P., Yang, S., Yang, J. W., Yi, Q. B., Zhang, Fan., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhang, K., Zhang, P., Zhao, X. Y., Zhao, Y., Zheng, S. J., and Zhou, X.

Subjects
Physics - Instrumentation and Detectors
Abstract

The GECAM mission consists of two identical microsatellites (GECAM-A and GECAM-B). Each satellite is equipped with 25 gamma-ray detectors (GRD) and 8 charged particle detectors (CPD). The main scientific objective of the GECAM mission is to detect gamma-ray bursts (GRBs) associated with the gravitational wave events produced by the merging of binary compact stars. After the launch on Dec. 10, 2020 , we carried out a series of on orbit tests. This paper introduces the test results of the GECAM-B satellite. According to the in-flight performance, the energy band for gamma-ray detection of GECAM-B is from about 7 keV to 3.5 MeV. GECAM-B can achieve prompt localization of GRBs. For the first time, GECAM-B realized a quasi-real-time transmission of trigger information using Beidou-3 RDSS. Keywords GECAM, gamma-ray burst, gravitational wave, GRD, CPD, Comment: 16 pages, 8 figures

Published
2021

10. Dedicated SiPM array for GRD of GECAM

Author

Zhang, D. L., Sun, X. L., An, Z. H., Li, X. Q., Wen, X. Y., Gong, K., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Liu, Y. Q., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Zhang, Fan, Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., and Zhou, X.

Subjects
High Energy Physics - Experiment, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The discovery of gravitational waves and gamma-ray bursts heralds the era of multi-messenger astronomy. With the adoption of two small satellites to achieve the all-sky monitoring of gamma-ray bursts, the gravitational wave high-energy electromagnetic counterpart all-sky monitor (GECAM) possesses a quasi-real-time early warning ability and plays an important role in positioning the sources of gravitational waves and in subsequent observations.

Published
2021

11. Quality assurance test and Failure Analysis of SiPM Arrays of GECAM Satellites

Author

Zhang, D. L., Gao, M., Sun, X. L., Li, X. Q., An, Z. H., Wen, X. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, R., Gong, K., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Liu, Y. Q., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Zhang, Fan., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., and Zhou, X.

Subjects
Physics - Instrumentation and Detectors
Abstract

The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) satellite consists of two small satellites. Each GECAM payload contains 25 gamma ray detectors (GRD) and 8 charged particle detectors (CPD). GRD is the main detector which can detect gamma-rays and particles and localize the Gamma-Ray Bursts (GRB),while CPD is used to help GRD to discriminate gamma-ray bursts and charged particle bursts. The GRD makes use of lanthanum bromide (LaBr3) crystal readout by SiPM. As the all available SiPM devices belong to commercial grade, quality assurance tests need to be performed in accordance with the aerospace specifications. In this paper, we present the results of quality assurance tests, especially a detailed mechanism analysis of failed devices during the development of GECAM. This paper also summarizes the application experience of commercial-grade SiPM devices in aerospace payloads, and provides suggestions for forthcoming SiPM space applications., Comment: 13 pages, 23 figures

Published
2021

12. The data acquisition algorithm designed for the SiPM-based detectors of GECAM satellite

Author

Liu, Y. Q., Gong, K., Li, X. Q., Wen, X. Y., An, Z. H., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Sun, X. L., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Yi, Q. B., Zhang, Fan, Zhang, D. L., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., Zhao, Y., and Zhou, X.

Published
2022
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13. The design and performance of charged particle detector onboard the GECAM mission

Author

Xu, Y. B., Li, X. Q., Sun, X. L., Yang, S., Wang, H., Peng, W. X., Liang, X. H., Gong, K., Liu, Y. Q., Guo, D. Y., Zhao, X. Y., Li, C. Y., An, Z. H., He, J. J., Liu, X. J., Wen, X. Y., Xiong, S. L., Zhang, Fan, Zhang, D. L., Zhang, C. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Hou, D. J., Li, Y. G., Li, G., Li, L., Li, X. F., Li, M. S., Lu, F. J., Lu, H., Meng, B., Shi, F., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xu, Y. P., Yang, J. W., Yi, Q. B., Zhang, S. N., Zhang, C. M., Zhang, F., Zhao, Y., and Zhou, X.

Published
2022
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14. Dedicated SiPM array for GRD of GECAM

Author

Zhang, D. L., Sun, X. L., An, Z. H., Li, X. Q., Wen, X. Y., Gong, K., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Liu, Y. Q., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Zhang, Fan, Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., and Zhou, X.

Published
2022
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15. Quality assurance test and failure analysis of SiPM arrays of GECAM satellites

Author

Zhang, D. L., Gao, M., Sun, X. L., Li, X. Q., An, Z. H., Wen, X. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, R., Gong, K., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Liu, Y. Q., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Zhang, Fan., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., and Zhou, X.

Published
2022
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16. The design and performance of GRD onboard the GECAM satellite

Author

An, Z. H., Sun, X. L., Zhang, D. L., Yang, S., Li, X. Q., Wen, X. Y., Gong, K., Liang, X. H., Liu, X. J., Liu, Y. Q., Li, Y. G., Xiong, S. L., Xu, Y. B., Zhang, Fan, Zhao, X. Y., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Feng, P. Y., Gao, M., Gao, R., Guo, D. Y., He, J. J., Hou, D. J., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xu, Y. P., Yang, J. W., Yi, Q. B., Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, Y., and Zhou, X.

Published
2022
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17. The technology for detection of gamma-ray burst with GECAM satellite

Author

Li, X. Q., Wen, X. Y., An, Z. H., Cai, C., Chang, Z., Chen, G., Chen, C., Du, Y. Y., Gao, M., Gao, R., Gong, K., Guo, D. Y., He, J. J., Hou, D. J., Li, Y. G., Li, C. Y., Li, G., Li, L., Li, X. F., Li, M. S., Liang, X. H., Liu, X. J., Liu, Y. Q., Lu, F. J., Lu, H., Meng, B., Peng, W. X., Shi, F., Sun, X. L., Wang, H., Wang, J. Z., Wang, Y. S., Wang, H. Z., Wen, X., Xiao, S., Xiong, S. L., Xu, Y. B., Xu, Y. P., Yang, S., Yang, J. W., Yi, Q. B., Zhang, D. L., Zhang, Fan, Zhang, S. N., Zhang, C. Y., Zhang, C. M., Zhang, Fei, Zhao, X. Y., Zhao, Y., Zhou, X., Zhang, C. S., Yu, J. P., Chang, L., Zhang, K. K., Huang, J., Chen, Y. M., and Han, X. B.

Published
2022
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18. Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3

Author

Niu, W., Zhang, Y., Gan, Y. L., Christensen, D. V., Soosten, M. V., Garcia-Suarez, E. J., Riisager, a., Wang, X., Xu, Y. B., Zhang, R., Pryds, N., and Chen, Y. Z.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Herein, we reported giant tunability of the physical properties of 2DEGs at the spinel/perovskite interface of {\gamma}-Al2O3/SrTiO3 (GAO/STO). By modulating the carrier density thus the band filling with ionic-liquid gating, the system experiences a Lifshitz transition at a critical carrier density of 3E13 cm-2, where a remarkably strong enhancement of Rashba spin-orbit interaction and an emergence of Kondo effect at low temperatures are observed. Moreover, as the carrier concentration depletes with decreasing gating voltage, the electron mobility is enhanced by more than 6 times in magnitude, leading to the observation of clear quantum oscillations. The great tunability of GAO/STO interface by EDLT gating not only shows promise for design of oxide devices with on-demand properties, but also sheds new light on the electronic structure of 2DEG at the non-isostructural spinel/perovskite interface., Comment: Nano Letters 2017

Published
2017
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19. Suppressed carrier density for the patterned high mobility two-dimensional electron gas at gamma-Al2O3/SrTiO3 heterointerfaces

Author

Niu, W., Gan, Y. L., Zhang, Y., Christensen, D. V., von Soosten, M., Wang, X. F., Xu, Y. B., Zhang, R., Pryds, N., and Chen, Y. Z.

Subjects
Condensed Matter - Materials Science
Abstract

The two-dimensional electron gas (2DEG) at the non-isostructural interface between spinel gamma-Al2O3 and perovskite SrTiO3 is featured by a record electron mobility among complex oxide interfaces in addition to a high carrier density up to the order of 1E15 cm-2. Herein, we report on the patterning of 2DEG at the gamma-Al2O3/SrTiO3 interface grown at 650 {\deg}C by pulsed laser deposition using a hard mask of LaMnO3. The patterned 2DEG exhibits a critical thickness of 2 unit cells of gamma-Al2O3 for the occurrence of interface conductivity, similar to the unpatterned sample. However, its maximum carrier density is found to be approximately 3E13 cm-2, much lower than that of the unpatterned sample (1E15 cm-2). Remarkably, a high electron mobility of approximately 3,600 cm2V-1s-1 was obtained at low temperatures for the patterned 2DEG at a carrier density of 7E12 cm-2, which exhibits clear Shubnikov-de Hass quantum oscillations. The patterned high-mobility 2DEG at the gamma-Al2O3/SrTiO3 interface paves the way for the design and application of spinel/perovskite interfaces for high-mobility all-oxide electronic devices., Comment: 4 figures

Published
2017
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20. Curvature of the spectral energy distribution, the dominant process for inverse Compton component and other jet properties in Fermi 2LAC blazars

Author

Xue, R., Luo, D., Du, L. M., Wang, Z. R., Xie, Z. H., Yi, T. F., Xiong, D. R., Xu, Y. B., Liu, W. G., and Yu, X. L.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We fit the spectral energy distributions (SEDs) of members of a large sample of Fermi 2LAC blazars to synchrotron and inverse Compton (IC) models. Our main results are as follows. (i) As suggested by previous works, the correlation between peak frequency and curvature can be explained by statistical or stochastic particle acceleration mechanisms. For BL Lacs, we find a linear correlation between synchrotron peak frequency and its curvature. The slope of the correlation is consistent with the stochastic acceleration mechanisms and confirm previous studies. For FSRQs, we also find a linear correlation, but its slope cannot be explained by previous theoretical models. (ii) We find a significant correlation between IC luminosity and synchrotron luminosity. The slope of the correlation of FSRQs is consistent with the EC process. And the slope of the correlation of BL Lac is consistent with the SSC process. (iii) We find several significant correlations between IC curvature and several basic parameters of blazars (black hole mass, broad line luminosity, the Lorentz factor of jet). We also find significant correlations between bolometric luminosity and these basic parameters of blazars which suggest that the origin of jet is a mixture of the mechanisms proposed by Blandford $\&$ Znajek and by Blandford $\&$ Payne., Comment: 17 pages, 9 figures, 5 tables. Accepted for publication in the Monthly Notices of the Royal Astronomical Society

Published
2016
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21. Spin and orbital moments of nanoscale Fe3O4 epitaxial thin film on MgO/GaAs(100)

Author

Liu, W. Q., Xu, Y. B., Wong, P. K. J., Maltby, N. J., Li, S. P., Wang, X. F., Du, J., You, B., Wu, J., Bencok, P., and Zhang, R.

Subjects
Condensed Matter - Materials Science
Abstract

Nanoscale Fe3O4 epitaxial thin film has been synthesized on MgO/GaAs(100) spintronic heterostructure, and studied with X-ray magnetic circular dichroism (XMCD). We have observed a total magnetic moment of (3.32 +- 0.1) uB/f.u., retaining 83% of the bulk value. Unquenched orbital moment of (0.47 +- 0.05) uB/f.u. has been confirmed by carefully applying the sum rule. The results offer direct experimental evidence of the bulk-like total magnetic moment and a large orbital moment in the nanoscale fully epitaxial Fe3O4/MgO/GaAs(100) heterostructure, which is significant for spintronics applications., Comment: arXiv admin note: substantial text overlap with arXiv:1501.01803

Published
2015
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22. X-ray magnetic circular dichroism study of epitaxial magnetite ultrathin film on MgO (100)

Author

Liu, W. Q., Song, M. Y., Maltby, N. J., Li, S. P., Lin, J. G., Samant, M. G., Parkin, S. S. P., Bencok, P., Steadman, Paul, Dobrynin, Alexey, Xu, Y. B., and Zhang, R.

Subjects
Condensed Matter - Materials Science
Abstract

The spin and orbital magnetic moments of the Fe3O4 epitaxial ultrathin film synthesized by plasma assisted simultaneous oxidization on MgO(100) have been studied with X-ray magnetic circular dichroism (XMCD). The ultrathin film retains a rather large total magnetic moment, i.e. (2.7+-0.15) uB/f.u., which is ~ 70% of that for the bulk-like Fe3O4. A significant unquenched orbital moment up to (0.54+-0.05) uB/f.u. was observed, which could come from the symmetry breaking at the Fe3O4/MgO interface. Such sizable orbital moment will add capacities to the Fe3O4-based spintronics devices in the magnetization reversal by the electric field.

Published
2015
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26. The First GECAM Observation Results on Terrestrial Gamma‐Ray Flashes and Terrestrial Electron Beams

Author

Zhao, Y., primary, Liu, J. C., additional, Xiong, S. L., additional, Xue, W. C., additional, Yi, Q. B., additional, Lu, G. P., additional, Xu, W., additional, Lyu, F. C., additional, Sun, J. C., additional, Peng, W. X., additional, Zheng, C., additional, Zhang, Y. Q., additional, Cai, C., additional, Xiao, S., additional, Xie, S. L., additional, Wang, C. W., additional, Tan, W. J., additional, An, Z. H., additional, Chen, G., additional, Du, Y. Q., additional, Huang, Y., additional, Gao, M., additional, Gong, K., additional, Guo, D. Y., additional, He, J. J., additional, Li, B., additional, Li, G., additional, Li, X. Q., additional, Li, X. B., additional, Liao, J. Y., additional, Liang, J., additional, Liang, X. H., additional, Liu, Y. Q., additional, Ma, X., additional, Qiao, R., additional, Song, L. M., additional, Song, X. Y., additional, Sun, X. L., additional, Wang, J., additional, Wang, J. Z., additional, Wang, P., additional, Wen, X. Y., additional, Wu, H., additional, Xu, Y. B., additional, Yang, S., additional, Zhang, B. X., additional, Zhang, D. L., additional, Zhang, F., additional, Zhang, P., additional, Zhang, H. M., additional, Zhang, Z., additional, Zhao, X. Y., additional, Zheng, S. J., additional, Zhang, K. K., additional, Han, X. B., additional, Wu, H. Y., additional, Hu, T., additional, Geng, H., additional, Zhang, H. B., additional, Lu, F. J., additional, Zhang, S. N., additional, and Yu, H., additional

Published
2023
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27. The high-energy particle package onboard CSES

Author

Li, X. Q., Xu, Y. B., An, Z. H., Liang, X. H., Wang, P., Zhao, X. Y., Wang, H. Y., Lu, H., Ma, Y. Q., Shen, X. H., Wen, X. Y., Wang, H., Zhang, D. L., Shi, F., Peng, W. X., Gao, M., Yu, X. X., Wang, J. Z., Zhang, Y. J., Zhang, J. L., Zhang, J., Li, H. X., Zeng, J. R., and Nan, Y. F.

Published
2019
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35. On-ground and on-orbit time calibrations of GECAM

Author

Xiao, S, primary, Liu, Y Q, additional, Peng, W X, additional, An, Z H, additional, Xiong, S L, additional, Tuo, Y L, additional, Gong, K, additional, Zhang, P, additional, Zhang, K, additional, Zheng, S J, additional, Li, C Y, additional, Gao, M, additional, Guo, D Y, additional, Li, X Q, additional, Liang, X H, additional, Liu, X J, additional, Qiao, R, additional, Sun, X L, additional, Wang, J Z, additional, Wen, X Y, additional, Xu, Y B, additional, Yang, S, additional, Zhang, D L, additional, Zhang, Fan, additional, Zhang, Fei, additional, Zhao, X Y, additional, Qi, J L, additional, Han, X B, additional, Li, Z D, additional, Huang, J, additional, Song, L M, additional, Cai, C, additional, Yi, Q B, additional, Zhao, Y, additional, Song, X Y, additional, Huang, Y, additional, Ge, M Y, additional, Ma, X, additional, Li, X B, additional, Li, B, additional, Wang, P, additional, Wang, J, additional, Zhang, Y Q, additional, Zhang, Z, additional, Zhang, X L, additional, Zhao, H Y, additional, Guo, Z W, additional, Chen, C, additional, Xie, S L, additional, and Zhang, S N, additional

Published
2022
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36. The design and performance of GRD onboard the GECAM satellite

Author

An, Z. H., primary, Sun, X. L., additional, Zhang, D. L., additional, Yang, S., additional, Li, X. Q., additional, Wen, X. Y., additional, Gong, K., additional, Liang, X. H., additional, Liu, X. J., additional, Liu, Y. Q., additional, Li, Y. G., additional, Xiong, S. L., additional, Xu, Y. B., additional, Zhang, Fan, additional, Zhao, X. Y., additional, Cai, C., additional, Chang, Z., additional, Chen, G., additional, Chen, C., additional, Du, Y. Y., additional, Feng, P. Y., additional, Gao, M., additional, Gao, R., additional, Guo, D. Y., additional, He, J. J., additional, Hou, D. J., additional, Li, C. Y., additional, Li, G., additional, Li, L., additional, Li, X. F., additional, Li, M. S., additional, Lu, F. J., additional, Lu, H., additional, Meng, B., additional, Peng, W. X., additional, Shi, F., additional, Wang, H., additional, Wang, J. Z., additional, Wang, Y. S., additional, Wang, H. Z., additional, Wen, X., additional, Xiao, S., additional, Xu, Y. P., additional, Yang, J. W., additional, Yi, Q. B., additional, Zhang, S. N., additional, Zhang, C. Y., additional, Zhang, C. M., additional, Zhang, Fei, additional, Zhao, Y., additional, and Zhou, X., additional

Published
2021
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37. The technology for detection of gamma-ray burst with GECAM satellite

Author

Li, X. Q., primary, Wen, X. Y., additional, An, Z. H., additional, Cai, C., additional, Chang, Z., additional, Chen, G., additional, Chen, C., additional, Du, Y. Y., additional, Gao, M., additional, Gao, R., additional, Gong, K., additional, Guo, D. Y., additional, He, J. J., additional, Hou, D. J., additional, Li, Y. G., additional, Li, C. Y., additional, Li, G., additional, Li, L., additional, Li, X. F., additional, Li, M. S., additional, Liang, X. H., additional, Liu, X. J., additional, Liu, Y. Q., additional, Lu, F. J., additional, Lu, H., additional, Meng, B., additional, Peng, W. X., additional, Shi, F., additional, Sun, X. L., additional, Wang, H., additional, Wang, J. Z., additional, Wang, Y. S., additional, Wang, H. Z., additional, Wen, X., additional, Xiao, S., additional, Xiong, S. L., additional, Xu, Y. B., additional, Xu, Y. P., additional, Yang, S., additional, Yang, J. W., additional, Yi, Q. B., additional, Zhang, D. L., additional, Zhang, Fan, additional, Zhang, S. N., additional, Zhang, C. Y., additional, Zhang, C. M., additional, Zhang, Fei, additional, Zhao, X. Y., additional, Zhao, Y., additional, Zhou, X., additional, Zhang, C. S., additional, Yu, J. P., additional, Chang, L., additional, Zhang, K. K., additional, Huang, J., additional, Chen, Y. M., additional, and Han, X. B., additional

Published
2021
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38. Quality assurance test and failure analysis of SiPM arrays of GECAM satellites

Author

Zhang, D. L., primary, Gao, M., additional, Sun, X. L., additional, Li, X. Q., additional, An, Z. H., additional, Wen, X. Y., additional, Cai, C., additional, Chang, Z., additional, Chen, G., additional, Chen, C., additional, Du, Y. Y., additional, Gao, R., additional, Gong, K., additional, Guo, D. Y., additional, He, J. J., additional, Hou, D. J., additional, Li, Y. G., additional, Li, C. Y., additional, Li, G., additional, Li, L., additional, Li, X. F., additional, Li, M. S., additional, Liang, X. H., additional, Liu, X. J., additional, Liu, Y. Q., additional, Lu, F. J., additional, Lu, H., additional, Meng, B., additional, Peng, W. X., additional, Shi, F., additional, Wang, H., additional, Wang, J. Z., additional, Wang, Y. S., additional, Wang, H. Z., additional, Wen, X., additional, Xiao, S., additional, Xiong, S. L., additional, Xu, Y. B., additional, Xu, Y. P., additional, Yang, S., additional, Yang, J. W., additional, Zhang, Fan., additional, Zhang, S. N., additional, Zhang, C. Y., additional, Zhang, C. M., additional, Zhang, Fei, additional, Zhao, X. Y., additional, and Zhou, X., additional

Published
2021
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43. Влияние распределения гадолиний содержащих твэлов реактора ВВЭР-1000 на выгорание

Author

Xu, Y. B., Bedenko, Sergey Vladimirovich, and Bedenko, Sergey Vladimirovich

Subjects
выгорающие поглотители, ТВЭЛы, гадолиний, ВВЭР-1000, реакторы, нейтронно-физические свойства
Abstract

Различный состав и пространственное распределение выгорающих поглотителей по-разному влияют на размножающие и теплофизические свойства реактора. В работе создана расчетная 3D модель ТВС реактора с выгорающими поглотителями. В качестве выгорающих поглотителей используются традиционно-применяемые Gd2O3-содержащие твэлы и твэлы с AmO2. Проведенные расчеты позволили исследовать нейтронно-физические свойства реактора и нивелировать, возникающие офсеты энерговыделения в переходных режимах эксплуатации.

Published
2021

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