孙志宇
博士 研究员 博士生导师
中国科学院近代物理研究所
主要从事放射性束物理、核物质性实验研究及探测器研发等工作。
个性化签名
- 姓名:孙志宇
- 目前身份:在职研究人员
- 担任导师情况:博士生导师
- 学位:博士
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学术头衔:
博士生导师
- 职称:高级-研究员
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学科领域:
原子核物理学
- 研究兴趣:主要从事放射性束物理、核物质性实验研究及探测器研发等工作。
孙志宇,中国科学院近代物理研究所研究员,研究室主任,博士生导师,所学术委员会委员。
199109~199607,在清华大学学习,获得理学学士学位;199608~200107,在中国科学院近代物理研究所学习,获得理学博士学位;199903~200006,在德国重离子研究中心(GSI)访问研究;200107~现在, 在中国科学院近代物理研究所工作, 先后担任助理研究员、副研究员、研究员;200610~200804,在美国密西根州立大学(MSU)作高级访问学者。
主要从事放射性束物理、核物质性实验研究及探测器研发等工作,先后承担了包括院先导专项项目、国家基金委重点课题、科技部973课题等多项研究课题和任务,并在多项重大实验研究装置的研制中承担重要工作。为兰州放射性次级束流线、HIRFL-CSR实验物理终端和暗物质粒子探测卫星(我国首颗单一载荷科学探测卫星)等项目的顺利开展及完成做出了重要贡献。主持和参与了多项核物理实验研究并取得丰硕的成果,在国内外核心学术刊物上参与发表研究论文上百篇,被引用超千次。并先后获得中国科学院科技进步一等奖(1999)、中科院王宽诚西部学者突出贡献奖(2009)、国家自然科学基金委员会优秀青年科学基金资助(2013)、甘肃省科技进步一等奖(2019)等奖励。
社会兼职:
中国核物理学会理事
中国电子学会核电子学与核探测器分会理事
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主页访问
110
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关注数
0
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成果阅读
1245
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成果数
20
【期刊论文】One-proton knockout from 16C at around 240 MeV/nucleon
Phys. Rev. C,2019,100(4):044609
2019年10月17日
The cross section for one-proton knockout from 16C with a large neutron-proton separation energy asymmetry on a carbon target has been measured at an intermediate beam energy of around 240 MeV/nucleon. The measured cross section is compared to the predictions based on the eikonal reaction model with shell-model structure inputs. The beam-energy dependence of the reduction on the extracted spectroscopic strength for strongly bound nucleon removal is derived from combining the existing intermediate-energy data with the present measurement. The deduced reduction factor Rs, defined as the ratio of the measured and theoretical cross sections, for the strongly bound nucleon removal at around 240 MeV/nucleon is consistent with the systematics observed from knockout reactions induced by light nuclear targets at intermediate energies of around 80 MeV/nucleon.
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【期刊论文】Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite
Science Advances,2019,5(9):eaax3793
2019年09月27日
The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic ray proton fluxes with kinetic energies from 40 GeV to 100 TeV, with 2 1/2 years of data recorded by the DArk Matter Particle Explorer (DAMPE). This is the first time that an experiment directly measures the cosmic ray protons up to ~100 TeV with high statistics. The measured spectrum confirms the spectral hardening at ~300 GeV found by previous experiments and reveals a softening at ~13.6 TeV, with the spectral index changing from ~2.60 to ~2.85. Our result suggests the existence of a new spectral feature of cosmic rays at energies lower than the so-called knee and sheds new light on the origin of Galactic cosmic rays.
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【期刊论文】Two-neutron removal cross sections from 15,16C at around 240 MeV/nucleon
Phys. Rev. C,-0001,99(2):024605
-1年11月30日
The cross sections for two-neutron removal from 15,16C on a carbon target have been measured at around 240 MeV/nucleon. The measured cross section for 15C is smaller than for 16C. The trends of the cross sections for 15,16C are inconsistent with the previously reported experimental data, but in agreement with the theoretical predictions based on eikonal-model calculations. Based on the present results of 15,16C combined with the available experimental data on 17–20C, an odd-even staggering of the two-neutron removal cross sections along the neutron-rich carbon isotopic chain from 15C to 20C is observed, and this feature is well reproduced by the theoretical calculations.
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment,2018,893():68-74
2018年06月11日
A Time-Of-Flight Wall (TOFW) detector has been designed and constructed at the External Target Facility (ETF) of HIRFL-CSR. The detector covers a sensitive area of 1.2 × 1.2 m2 and consists of 30 modules. Each module is composed of a long plastic scintillator bar with two photo-multiplier tubes coupled at both ends for readout. The design and manufacture details are described and the test results are reported. The performance of the TOFW detector has been tested and measured with cosmic rays and a 310 MeV/u 40Ar beam. The results show that the time resolutions of all the TOFW modules are better than 128 ps, satisfying the requirements of the experiments which will be carried out at the ETF.
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【期刊论文】The drift chamber array at the external target facility in HIRFL-CSR
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment,2018,894():72-80
2018年06月21日
A drift chamber array at the External Target Facility in HIRFL-CSR has been constructed for three-dimensional particle tracking in high-energy radioactive ion beam experiments. The design, readout, track reconstruction program and calibration procedures for the detector are described. The drift chamber array was tested in a 311 AMeV 40Ar beam experiment. The detector performance based on the measurements of the beam test is presented. A spatial resolution of 230μm is achieved.
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【期刊论文】The plastic scintillator detector for DAMPE
Astroparticle Physics,2017,94():1-10
2017年09月01日
The DArk Matter Particle Explorer (DAMPE) is a general purpose satellite-borne high energy γ−ray and cosmic ray detector. Among the scientific objectives of DAMPE are the search for the origin of cosmic rays and an understanding of the Dark Matter particles. As one of the four detectors in DAMPE, the Plastic Scintillator Detector (PSD) plays an important role in the particle charge measurement and the photons/electrons discrimination. It can identify the atomic number Z/charge states of relativistic ions from H to Fe and the detection efficiency for Z = 1 particles can reach 0.9999. The PSD has been working reliably since the successfully launching of DAMPE on December 17, 2015. In this paper, the design, assembly, qualification tests of the PSD and some of the performance measured on the ground are presented in detail.
Dark matter particle DAMPE Satellite-borne apparatus Plastic scintillator Large dynamic range
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【期刊论文】Design and construction of a multi-layer CsI(Tl) telescope for high-energy reaction studies
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment,2017,843():5-10
2017年01月21日
A prototype of a new CsI(Tl) telescope, which will be used in the reaction studies of light isotopes with energy of several hundred AMeV, was constructed and tested at the Institute of Modern Physics, Chinese Academy of Sciences. The telescope has a multi-layer structure, and the range information was obtained to improve the particle identification performance. This prototype has seven layers of different thickness. An energy resolution of 5.0% (FWHM) was obtained for one of the layers in a beam test experiment. Positive improvement for the identification of 14O and 15O isotopes was achieved using the range information.
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Nature,2017,552():63–66
2017年11月29日
High-energy cosmic-ray electrons and positrons (CREs), which lose energy quickly during their propagation, provide a probe of Galactic high-energy processes1,2,3,4,5,6,7 and may enable the observation of phenomena such as dark-matter particle annihilation or decay8,9,10. The CRE spectrum has been measured directly up to approximately 2 teraelectronvolts in previous balloon- or space-borne experiments11,12,13,14,15,16, and indirectly up to approximately 5 teraelectronvolts using ground-based Cherenkov γ-ray telescope arrays17,18. Evidence for a spectral break in the teraelectronvolt energy range has been provided by indirect measurements17,18, although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range 25 gigaelectronvolts to 4.6 teraelectronvolts by the Dark Matter Particle Explorer (DAMPE)19 with unprecedentedly high energy resolution and low background. The largest part of the spectrum can be well fitted by a ‘smoothly broken power-law’ model rather than a single power-law model. The direct detection of a spectral break at about 0.9 teraelectronvolts confirms the evidence found by previous indirect measurements17,18, clarifies the behaviour of the CRE spectrum at energies above 1 teraelectronvolt and sheds light on the physical origin of the sub-teraelectronvolt CREs.
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【期刊论文】The DArk Matter Particle Explorer mission
Astroparticle Physics,2017,95():6-24
2017年10月01日
The DArk Matter Particle Explorer (DAMPE), one of the four scientific space science missions within the framework of the Strategic Pioneer Program on Space Science of the Chinese Academy of Sciences, is a general purpose high energy cosmic-ray and gamma-ray observatory, which was successfully launched on December 17th, 2015 from the Jiuquan Satellite Launch Center. The DAMPE scientific objectives include the study of galactic cosmic rays up to ∼ 10 TeV and hundreds of TeV for electrons/gammas and nuclei respectively, and the search for dark matter signatures in their spectra. In this paper we illustrate the layout of the DAMPE instrument, and discuss the results of beam tests and calibrations performed on ground. Finally we present the expected performance in space and give an overview of the mission key scientific goals.
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【期刊论文】Temperature dependence of the plastic scintillator detector for DAMPE*
Chinese Physics C,-0001,41(1):016001
-1年11月30日
The Plastic Scintillator Detector (PSD) is one of the main sub-detectors in the DArk Matter Particle Explorer (DAMPE) project. It will be operated over a large temperature range from −10 to 30 °C, so the temperature effect of the whole detection system should be studied in detail. The temperature dependence of the PSD system is mainly contributed by the three parts: the plastic scintillator bar, the photomultiplier tube (PMT), and the Front End Electronics (FEE). These three parts have been studied in detail and the contribution of each part has been obtained and discussed. The temperature coefficient of the PMT is −0.320(±0.033)%/°C, and the coefficient of the plastic scintillator bar is −0.036(±0.038)%/°C. This result means that after subtracting the FEE pedestal, the variation of the signal amplitude of the PMT-scintillator system due to temperature mainly comes from the PMT, and the plastic scintillator bar is not sensitive to temperature over the operating range. Since the temperature effect cannot be ignored, the temperature dependence of the whole PSD has been also studied and a correction has been made to minimize this effect. The correction result shows that the effect of temperature on the signal amplitude of the PSD system can be suppressed.
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