检索结果-南通市图书馆

Density fluctuations in intermediate-energy heavy-ion collisions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

nuclear Science and Techniques 2022年第5期33卷 1-7页

作者： Cong Liu Xian-Gai Deng Yu-Gang Ma Shanghai Institute of Applied physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China key laboratory of nuclear physics and ion-beam application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical nuclear physics NSFC and Fudan UniversityShanghai 200438China

Within the framework of the isospin-dependent quantum molecular dynamics model,we simulate^(129)Xe+^(119)Sn collisions in an incident energy range of 20 to 190MeV/nucleon and discuss the liquid-gas phase transition with density *** comparison,we also extract the effective Fisher parameter τ_(eff),multiplicity of intermediate-mass fragments(IMFs),and information *** is found that the Fisher parameter and maximum information entropy of collisions have peak values at E_(beam)=50-80 MeV/*** addition,the maximum multiplicity of IMFs has a plateau around 70 MeV/*** higher-order density moments in a larger central region of[-5,5]^(3) fm^(3) in the collision system,a maximum plateau also appears as function of beam energy at energies exceeding 70 MeV/*** observables,which are consistent with each other,indicate a liquid-gas phase transition around 70 MeV/nucleon for the^(129)Xe+^(119)Sn system.

关键词： Heavy-ioncollisions Liquid-gasphase transition IQMD Density moment Intermediatemass fragment Informationentropy Fisher-lawparameter

Irradiation effect of yttria-stabilized zirconia by high dose dual ion beam irradiation

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2014年第6期23卷 417-421页

作者：张艳文王绪刘士毅唐美雄赵子强张鹏王宝义曹兴忠 State key laboratory of nuclear physics and Technology Institute of Heavy Ion Physics Peking University key laboratory of nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences

Yttria-stabilized zirconia （YSZ） is irradiated with 2.0-MeV Au2＋ ions and 30-keV He＋ ions. Three types of He, Au, Au ＋ He （successively） ion irradiation are performed. The maximum damage level of a sequential dual ion beam implanted sample is smaller than single Au ion implanted sample. A comparable volume swelling is found in a sequential dual ion beam irradiated sample and it is also found in a single Au ion implanted sample. Both effects can be explained by the partial reorganization of the dislocation network into weakly damaged regions in the dual ion beam implanted YSZ. A vacancy-assisted helium trapping/diffusion mechanism in the dual ion beam irradiated condition is discussed. No phase transformation or amorphization behavior happens in all types of ion irradiated YSZ.

关键词： irradiation damage swelling helium diffusion

Theoretical Design of a 104MHz Ladder Type IH-RFQ Accelerator

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2010年第11期27卷 47-50页

作者：聂元存陆元荣陈佳洱颜学庆高淑丽朱昆刘克新郭之虞 State key laboratory of nuclear physics and Technology Institute of Heavy Ion Physics Peking University Beijing 100871

beam dynamics and rf designs of a 104 MHz ladder type IH-RFQ （L-IH-RFQ） accelerator are finished at Peking University for the acceleration of 14C＋ from 40 keV to 500 keV. As a specific feature, the output beam energy spread is as low as 0.6% achieved with the internal discrete bunching method, which makes potential applications of RFQ feasible, such as accelerator mass spectrometry and ion implantation. Tolerances of the beam dynamics design are studied by means of changing the input beam parameters, and the results are quite satisfying. On the other hand, the L-IH-RFQ structure is employed, taking advantage of its mechanical stability and the absence of inter-electrode voltage asymmetry. Radio-frequency properties are studied and optimized for reducing power loss with Microwave Studio （MWS）. Tuning of the field flatness and frequency is investigated in principle.

关键词： Accelerators beams and electromagnetism nuclear physics Instrumentation and measurement Particle physics and field theory

A fast emittance measurement unit for high intensity DC beam

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2018年第2期27卷 446-449页

作者：张艾霖任海涛彭士香张滔徐源张景丰温佳美武文斌郭之虞陈佳洱 State key laboratory of nuclear Science and Technology & Institute of Heavy ion physics School of Physics Peking University

A combined unit, which has the ability to measure the current and emittance of the high intensity direct current（DC）ion beam, is developed at Peking University（PKU）. It is a multi-slit single-wire（MSSW）-type beam emittance meter combined with a water-cooled Faraday Cup, named high intensity beam emittance measurement unit-6（HIBEMU-6）. It takes about 15 seconds to complete one measurement of the beam current and its emittance. The emittance of a 50-mA@50-kV DC proton beam is measured.

关键词： emittance measurement high intensity DC beam MSSW

Applying deep learning technique to chiral magnetic wave search

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第8期48卷 170-176页

作者： Yuan-Sheng Zhao Xu-Guang Huang physics Department and Center for Particle physics and Field Theory Fudan UniversityShanghai 200433China key laboratory of nuclear physics and ion-beam application(MOE) Fudan UniversityShanghai 200433China Shanghai Research Center for Theoretical nuclear physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

The chiral magnetic wave(CMW)is a collective mode in quark-gluon plasma originated from the chiral magnetic effect(CME)and chiral separation *** detection in heavy-ion collisions is challenging owing to significant background ***[*** et al.,***.C 106,L051901(2022)],we constructed a neural network that accurately identifies the CME-related signal from the final-state pion *** this study,we have generalized this neural network to the case of CMW *** show that,after an updated training,the neural network effectively recognizes the CMW-related ***,we have assessed the performance of the neural network in comparison with other known methods for CMW search.

关键词： deep learning chiral magnetic wave relativistic heavy-ion collisions

Mixing of two-quasineutron and two-quasiproton K~π=6^+ configurations in the vicinity of ^(174)Yb

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2013年第3期37卷 41-44页

作者：焦长峰董国香许甫荣 State key laboratory of nuclear physics and Technology School of PhysicsPeking University Center for Theoretical nuclear physics National Laboratory for Heavy Ion Physics

In the framework of the projected shell model, we investigate the competition between the two-quasineutron and two-quasiproton K~π=6~＋ states in the ytterbium isotopes and N =104 isotones adjacent to ^（174）Yb. The ^（174）Yb results are compared with the experimental *** K~π =6~＋ isomer observed in ^（174） Yb is assigned as an admixture of the ν7/2^-[514] ν5/2^-[512] and π7/2~＋ [404]π5/2~＋ [402] intrinsic structure, which explains the experimental ｜g K-g R ｜ value. Similar mixing would appear in ^（174） Yb, ^（176） Hf,and ^（178） W. The low-lying K~π=6~＋ states are also predicted in ^（170-178） Yb.

关键词： Kisomers projected shell model rotational band,factor

The First Nine-Cell TESLA Cavity Made in China

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2008年第11期25卷 3940-3941页

作者：鲁向阳全胜文张保澄郝建奎朱凤林林徐文灿王尔东王芳靳松辛天牧姚中元陈佳洱赵夔 Institute of Heavy ion physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871

A totally home-made 9-cell TESLA type superconducting cavity is mane at Peking University. The cavity abrication is according to DESY specification. The cavity is made of high purity niobium from OTIC, Ningxia. The electron beam welding is carried out at Harbin Institute of Technology, Harbin. By the cooperation, the cavity is tested at Thomas Jefferson National Accelerator Facility, USA. The preliminary result shows the acceleration gradient Eacc is 23 MV/m without quench and has potential for improvement.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Triaxiality of High-K Isomers in A - 130 Region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics Letters 2008年第5期25卷 1621-1624页

作者：刘红亮许甫荣 School of physics and State key laboratory of nuclear physics and Technology Peking University Beijing 100871 Center for Theoretical nuclear physics National Laboratory for Heavy Ion Physics Lanzhou 730000

Remarkable triaxiality is found in the high-K isomeric states of A-130 nuclei using the configuration-constrained calculations of potential-energy surfaces. The triaxiality gives the further understanding of the decay properties of the isomers. The calculation with triaxiality can well explain the measured quadrupole moment of the K^z=7^- isomer in ^130Ce.

关键词： supernova explosion proto-neutron star shock wave

Quantifying the strength of magnetic fields using baryon electric charge correlation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

nuclear Science and Techniques 2024年第8期35卷 5-8页

作者： Xu‑Guang Huang physics Department and Center for Particle physics and Field Theory Fudan UniversityShanghai 200433China key laboratory of nuclear physics and ion‑beam application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical nuclear physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

Although heavy-ion collisions generate strong magnetic fields,their direct measurement is a challenging task.A new observable,the baryon electric charge correlation,was recently found to be sensitive to the magnetic field strength and thus could be used as a magnetometer for heavy-ion ***,this observable may shed light on the equation of state and phase structure of quantum chromodynamics(QCD)under magnetic *** and understanding the phase structure of quantum chromodynamics(QCD)is important in contemporary physics[1].

关键词： charge observable magnetic