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Performance of a small AT-TPC prototype

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Nuclear Science and techniques 2018年第7期29卷 138-144页

作者： Jin-Yan Xu qi-te li Yan-lin Ye Jian Gao Jia-Xing Han Shi-Wei Bai Ka-Hou Ng School of Physics and State Key Laboratory of Nuclear Physics and technology Peking University

A small prototype of an active-target time projection chamber detector based on the gas electron multiplier(GEM) readout technique was designed and *** calculations were performed to analyze the electric field distribution and optimize the *** particular,a guard ring installed above the GEM foil may play an important role in shaping the electric field in the gas vessel and improving the overall performance of the *** best results were obtained at a guard-ring voltage of-950 *** using a collimated a-particle source,an energy resolution of 3.6–4.0 ke V can be achieved for deposited energies of 18–21 keV,respectively.A position resolution of less 0.2 mm was observed along the electron drift direction,whereas the resolution in the readout plane was approximately 0.45 mm.A time resolution of less than 20 ns was *** using helium as the primary working gas as well as the target material,a t a elastic scattering events can be clearly imaged.

关键词：原型性能优化设计模拟计算工作气体宝石时间电子

Performance of the CAT-TPC based on two-dimensional readout strips

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Nuclear Science and techniques 2021年第8期32卷 78-84页

作者： li-Sheng Yang Jin-Yan Xu qi-te li Bin-Fei Ji Zi-Wei Cai Jia-Xing Han Shi-Wei Bai Yan-lin Ye Xiao-Fei Yang Chen-Gui Lu Ning-Tao Zhang Xiao-Dong Tang Jian Gao Hong-Yi Wu Zhong liu School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

A gas detector 140×140×140 mm^(3)in size,termed the compact active target time projection chamber(CAT-TPC),was developed in this study to measure resonant scattering associated with cluster structures in unstable *** CAT-TPC consists of an electronic field cage,double-thick gas-electron-multiplier foils,a general-purpose digital data acquisition system,and a newly developed two-dimensional strip-readout *** CAT-TPC was operated using a^(4)He(96%)+CO_(2)(4%)gas mixture at 400 *** working gas also serves as an active target for tracking charged *** overall performance of the CAT-TPC was evaluated using a collimated a-particle source.A time resolution of less than 20 ns and a position resolution of less than 0.2 mm were observed along the electron drift *** images of incident trajectories and scattering events can be clearly reconstructed under an angular resolution of approximately 0.45 degree.

关键词： AT-TPC Readout strips Guard ring Three-dimensional image

Control and data acquisition system for collinear laser spectroscopy experiments

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Nuclear Science and techniques 2023年第3期34卷 64-72页

作者： Yong-Chao liu Xiao-Fei Yang Shi-Wei Bai Shu-Jing Wang Peng Zhang Yin-Shen liu Han-Rui Hu Yang-Fan Guo Zhou Yan Ze-Yu Du Wen-Cong Mei Zhe-Yang lin Hong-Wei li Yan-lin Ye qi-te li Chuang-Ye He School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China China Institute of Atomic Energy(CIAE) P.O.Box 275(10)Beijing 102413China

A control and data acquisition system was implemented for the recently developed collinear laser spectroscopy *** system is dedicated to data recording,storage,processing,monitoring of the beam intensity and energy,and visualization of various *** comparison to the conventional resonance nuclear reaction system,the key technique is the precise synchronization of the detected counts with the actual scanning voltage(or probing laser frequency).The functions of the system were tested by measuring the hyperfine structure spectra of stable calcium(e.g.,^(40)Ca^(+))and radioactive potassium(e.g.,^(38)K)in the bunched and continuous modes,*** system will be routinely applied and further improved in subsequent laser spectroscopy experiments on unstable isotopes at the Beijing Radioactive Ion-beam Facility(BRIF).

关键词： Collinear laser spectroscopy Hyperfine structure Data acquisition system Voltage scanning

Commissioning of a high-resolution collinear laser spectroscopy apparatus with a laser ablation ion source

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Nuclear Science and techniques 2022年第1期33卷 98-106页

作者： Shi-Wei Bai Xiao-Fei Yang Shu-Jing Wang Yong-Chao liu Peng Zhang Yin-Shen liu Han-Rui Hu Yang-Fan Guo Jin Wang Ze-Yu Du Zhou Yan Yun-Kai Zhang Yan-lin Ye qi-te li Yu-Cheng Ge Chuang-Ye He School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China China Institute of Atomic Energy(CIAE) P.O.Box 275(10)Beijing 102413China

Collinear laser spectroscopy is a powerful tool for studying the nuclear spins,electromagnetic moments,and charge radii of exotic *** study the nuclear properties of unstable nuclei at the Beijing Radioactive Ion-beam Facility(BRIF)and the future High Intensity Heavy-ion Accelerator Facility(HIAF),we developed a collinear laser spectroscopy apparatus integrated with an offline laser ablation ion source and a laser *** overall performance of this state-of-the-art technique was evaluated,and the system was commissioned using a bunched stable ion *** high-resolution optical spectra for the 4s ^(2)S_(1/2)→4p^(2)P_(3/2)(D2)ionic transition of ^(40;42;44;48)Ca isotopes were successfully *** extracted isotope shifts relative to ^(40)Ca showed excellent agreement with the literature *** system is now ready for use at radioactive ion beam facilities such as the BRIF and paves the way for the further development of higher-sensitivity collinear resonance ionization spectroscopy techniques.

关键词： Nuclear properties Collinear laser spectroscopy Laser-ablation ion source Photon detection Isotope shift

Laser test of the prototype of CEE time projection chamber

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Nuclear Science and techniques 2018年第3期29卷 138-142页

作者： Wen Huang Fei Lu He li He Dong Yong-jin Ye Chen-Sheng Zhou Long-Xiang liu Long Du Xiao-Hai Jin Peng-liu Jin-Hui Chen Song Zhang Chen Zhong Chen Wu qi-te li Hong-liang Zang Yu-Cheng Ge Cheng-Jian lin Hui-Ming Jia Nan-Ru Ma Dong-Xi Wang Peng Ma Jun Xu De-qing Fang Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Nuclear Physics and technology School of PhysicsPeking UniversityBeijing 100871China China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

A prototype thick-GEM-based cooling storage ring external-target experiment(CEE) time projection chamber(TPC) is constructed and tested with the pulsed ultraviolet laser beams. The results indicate that the prototype TPC has a good performance in three-dimensional track resolution. In X direction the position resolution is about 0.2 mm, and in Y direction the position resolution is about 0.5 mm. The results also determine that the energy resolution is about 5.4%, which achieve the requirements of the CEE experiment and can be used to study the nuclear state equation and the quantum chromo dynamics.

关键词： TPC Thick GEM Laser test Track resolution Energy resolution

Novel evidence for the σ-bond linear-chain molecular structure in ^(14)C

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Chinese Physics C 2021年第8期45卷 71-75页

作者： Han-zhou Yu Jing li Yan-lin Ye BiaoYang Cheng-Jianlin Hui-Ming Jia Jian-ling Lou Xiao-Fei Yang T.Baba qi-te li Yu-Cheng Ge Zhi-Huan li Hui Hua Jin-Yan Xu Zai-Hong Yang Jun Feng Hong-liang Zang qiang liu Wei Jiang Yang liu Jing-Jing li Wei liu Shi-Wei Bai Jie Chen Jia-Xing Han Jia-Hao Chen Kai Ma Dong-Xi Wang Lei Yang Nan-Ru Ma li-Jie Sun School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China FRIB/NSCL Laboratory Michigan State UniversityEast LansingMichigan 48824USA China Institute of Atomic Energy Beijing 102413China Kitami Institute of technology 090-8507 KitamiJapan Research Center for Nuclear Physics(RCNP) Osaka University10-1 MihogaokaIbarakiOsaka 567-0047Japan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China

A multi-nucleon transfer and cluster decay experiment,^(7)li(^(11)B,^(14)C^(*)→α+^(10)Be)α,is conducted at an incident beam energy of 55 *** reaction channel has a significantly large 0-value,which favors populating the high lying resonant states in ^(14)*** decay paths,from these resonances to various states of the final nucleus ^(10) Be,can be selected,owing to the experimentally achieved optimal resolution of the Q-value spectrum.A number of resonant states are reconstructed from the forward emitting 10Be+α fragments,and their major molecular structures can be detected according to the selective decay paths and relative decay widths.A state at 22.4(2)MeV validates the previously measured and theoretically predicted band head of the positive-parity σ-bond linear-chain mo-lecular *** additional resonances at 22.9(2)and 24.2(2)MeV are identified and consistent with the predicted 2^(+) and 4^(+) members of the same molecular band,thus providing novel evidences for the existence of the exotic clustering chain structure in neutron-rich carbon isotopes.A few high energy resonances,which also indicate the presence of the σ-bond molecular structure,are observed;however,further studies are still required to clarify their ascription in band systematics.

关键词： linear-chain state reaction 0-value transfer reaction cluster decay relative branching ratio

Investigation of the near-threshold cluster resonance in ^14C

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Chinese Physics C 2018年第7期42卷 41-46页

作者： Hong-liang Zang Yan-lin Ye Zhi-Huan li Jian-Song Wang Jian-ling Lou qi-te li Yu-Cheng Ge Xiao-Fei Yang Jing li Wei Jiang Jun Feng qiang liu Biao Yang Zhi-qiang Chen Yang liu Hong-Yi Wu Chen-Yang Niu Chen-Guang li Chun-Guang Wang Xiang Wang Wei liu Jian Gao Han-Zhou Yu Jun-Bin Ma Peng Ma Zhen Bai Yan-Yun Yang Shi-Lun Jin Fei Lu School of Physics and State Key Laboratory of Nuclear Physics and technology Peking UniversityBeijing 100871China Institute of Modern Physics Chinese Academy of ScienceLanzhou 730000China Argonne National Laboratory 9700 S Cass Ave B109LemontIllinois 60439USA Institute of High Energy Physics CASBeijing 100049China RIKEN Nishina Center 2-1 HirosawaWakoSaitama 351-0198Japan Shanghai Institute of Applied Physics Chinese Academy of ScienceShanghai 200000China

An experiment for m p（14C},14C＊→10Be＋α）p inelastic excitation and decay was performed in inverse kinematics at a beam energy of 25.3 MeV/u. A series of 14C excited states, including a new one at 18.3（1） MeV, were observed which decay to various states of the final nucleus of 10Be. A specially designed telescope system, installed around zero degrees, played an essential role in detecting the resonant states near the α-separation threshold. A state at 14.1（1） MeV is clearly identified, being consistent with the predicted band-head of the molecular rotational band characterized by the π-bond linear chain configuration. Further clarification of the properties of this exotic state is suggested by using appropriate reaction tools.

关键词： cluster decay linear-chain-state high detection efficiency inelastic excitation

A New Measurement of ^11Be(p,d) Transfer Reaction

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Chinese Physics Letters 2018年第8期35卷 14-18页

作者： Ying Jiang Jian-ling Lou Yan-lin Ye Dan-Yang Pang Jie Chen Zhi-Huan li Yu-Cheng Ge qi-te li Jing li Wei Jiang Ye-Lei Sun Hong-liang Zang Yun Zhang Wei liu Gen li N.Aoi E.Ideguchi H.J.Ong J.Lee Jin Wu Hong-Na liu Chao Wen Y.Ayyad K.Hatanaka D.T.Tran T.Yamamoto M.Tanaka T.Suzuki T.T.Nguyen School of Physics and State Key Laboratory of Nuclear Physics and technology Peking University Beijing 100871 School of Physics and Nuclear Energy Engineering Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 Research Centre for Nuclear Physics Osaka university Osaka 567-0047 Japan Institute of Physical and Chemical Research Saitama 351-0198 Japan

A new ^11Be（p,d） transfer reaction experiment is performed in inverse kinematics with a radioactive11 Be beam at26.9 MeV. Three low-lying states, namely the 0＋ground state, the 2^＋ state at Ex = 3.37 MeV, and the multiplet at around 6 MeV in10 Be, are populated by this one-neutron transfer reaction. These three states in10 Be are clearly discriminated from the -value spectrum, which is rebuilt from energies and angles of the recoil deuterons in coincidence with10 Be. A spectroscopic factor for each state is extracted by comparing the experimental differential cross sections to the theoretical calculation results using the finite range adiabatic distorted wave approximation method with different global nucleon-nucleus potentials. It is found that the newly extracted spectroscopic factors for the 0＋and 2＋states are consistent with the previous ones, but the factor for the multiplet is smaller than the value in the reference, and the possible reason is discussed.

关键词： Be A New Measurement of p,d

Multilevel analysis of the central-peripheral-target organ pathway:contributing to recovery after peripheral nerve injury

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Neural Regeneration Research 2025年第10期20卷 2807-2822页

作者： Xizi Song Ruixin li Xiaolei Chu qi li Ruihua li qingwen li Kai-Yu Tong Xiaosong Gu Dong Ming Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Haihe Laboratory of Brain-Machine Interface and Human-Machine Fusion TianjinChina Department of Rehabilitation Tianjin University Tianjin HospitalTianjinChina Department of Hand Microsurgery Tianjin University Tianjin HospitalTianjinChina School of Exercise and Health Tianjin University of SportTianjinChina Department of Biomedical Engineering the Chinese University of Hong KongHong Kong Special Administrative RegionChina

Peripheral nerve injury is a common neurological condition that often leads to severe functional limitations and *** on the pathogenesis of peripheral nerve injury has focused on pathological changes at individual injury sites,neglecting multilevel pathological analysis of the overall nervous system and target *** has led to restrictions on current therapeutic *** this paper,we first summarize the potential mechanisms of peripheral nerve injury from a holistic perspective,covering the central nervous system,peripheral nervous system,and target *** peripheral nerve injury,the cortical plasticity of the brain is altered due to damage to and regeneration of peripheral nerves;changes such as neuronal apoptosis and axonal demyelination occur in the spinal *** nerve will undergo axonal regeneration,activation of Schwann cells,inflammatory response,and vascular system regeneration at the injury *** damage to target organs can occur,including skeletal muscle atrophy and sensory receptor *** then provide a brief review of the research advances in therapeutic approaches to peripheral nerve *** main current treatments are conducted passively and include physical factor rehabilitation,pharmacological treatments,cell-based therapies,and physical ***,most treatments only partially address the problem and cannot complete the systematic recovery of the entire central nervous system-peripheral nervous system-target organ ***,we should further explore multilevel treatment options that produce effective,long-lasting results,perhaps requiring a combination of passive(traditional)and active(novel)treatment methods to stimulate rehabilitation at the central-peripheral-target organ levels to achieve better functional recovery.

关键词： central nervous system central peripheral target organ multilevel pathological analysis nerve regeneration peripheral nerve injury peripheral nervous system target organs therapeutic approach