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Critical Opalescence and Its Impact on the Jet Quenching Parameter q

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Chinese Physics Letters 2024年第3期41卷 23-29页

作者：武警曹杉杉李峰 School of Physical science and Technology Lanzhou UniversityLanzhou 730000China Institute of Frontier and Interdisciplinary science Shandong UniversityQingdao 266237China Research center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CASLanzhou 730000China Lanzhou center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China

Jet quenching parameter q is essential for characterizing the interaction strength between jet partons and nuclear *** on the quark-meson model,we develop a new framework for calculating q at finite chemical potential... 详细信息

关键词： parameter quark calculating

Cross section determination of^(27)Al(n,2n)^(26)Al reaction induced by 14-MeV neutrons uniting with D-T neutron activation and AMS techniques

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Nuclear science and Techniques 2024年第6期35卷 78-89页

作者： Xian-Lin Yang Chang-Lin Lan Yu-Ting Wei Yi Zhang Gong Jiang Bo Xie Yu Liu Hong-Tao Shen Xiao-Jun Sun School of Nuclear science and Technology Lanzhou UniversityLanzhou 730000China moe frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China

Aluminum is the primary structural material in nuclear engineering,and its cross section induced by 14-MeV neutrons is of great *** address the issue of insufficient accuracy for the^(27)Al(n,2n)^(26)Al reaction cross section,the activation method and accelerator mass spectrometry(AMS)technique were used to determine the^(27)Al(n,2n)^(26)Al cross section,which could be used as a D-T plasma ion temperature monitor in fusion *** the China Academy of Engineering Physics,neutron activation was performed using a K-400 neutron generator produced by the T(d,n)4He ***^(26)Al∕^(27)Al isotope ratios were measured using the newly installed GYIG 1 MV AMS at the Institute of Geochemistry,Chinese Academy of *** neutron flux was monitored by measuring the activity of 92mNb produced by the 93Nb(n,2n)92mNb *** measured results were compared with available data in the experimental nuclear reaction database,and the measured values showed a reasonable degree of consistency with partially available literature *** newly acquired cross-sectional data at 12 neutron energy points through systematic measurements clarified the divergence,which has two different growth trends from the existing experimental *** obtained results are also compared with the corresponding evaluated database,and the newly calculated excitation functions with TALYS−1.95 and EMPIRE−3.2 codes,the agreement with CENDL−3.2,TENDL-2021 and EMPIRE−3.2 results are generally acceptable.A substantial improvement in the knowledge of the^(27)Al(n,2n)^(26)Al reaction excitation function was obtained in the present work,which will lay the foundation for the diagnosis of the fusion ion temperature,testing of the nuclear physics model,evaluation of nuclear data,etc.

关键词： 14-MeV neutron ^(27)Al(n,2n)^(26)Al Cross section AMS

Invisible and semi-invisible decays of bottom baryons

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Chinese Physics C 2024年第8期48卷 127-139页

作者： Yong Zheng Jian-Nan Ding Dong-Hao Li Lei-Yi Li Cai-Dian Lü Fu-Sheng Yu moe frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China School of Nuclear science and Technology Lanzhou UniversityLanzhou 730000China center for High Energy Physics Peking UniversityBeijing 100871China Institute of High Energy Physics CASBeijing 100049China School of Physical sciences University of Chinese Academy of SciencesBeijing 101408China

The similar densities of dark matter and baryons in the universe imply that they may arise from the same ultraviolet model.B-Mesogenesis,which assumes dark matter is charged under the baryon number,attempts to simultaneously explain the origin of baryon asymmetry and dark matter in the *** particular,B-Mesogenesis may induce bottom-baryon decays into invisible or semi-invisible final states,which provide a distinctive signal for probing this *** this work,we systematically study the invisible decays of bottom baryons into dark matter and the semi-invisible decays of bottom baryons into a meson or a photon together with a dark matter *** particular,the fully invisible decay can reveal the stable particles in *** QCD-based frameworks are used to calculate the hadronic matrix elements under the B-Mesogenesis *** estimate the constraints on the Wilson coefficients or the product of some new physics couplings with the Wilson coefficients according to the semi-invisible and invisible decays of bottom baryons detectable at future colliders.

关键词： baryon asymmetry dark matter B-Mesogenesis invisible and semi-invisible decay bottom baryons

Calculation of the energy dependence of fission fragments yields and kinetic energy distributions for neutron-induced ^(235)U fission

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Chinese Physics C 2024年第8期48卷 159-169页

作者： Ya-Ning Han Zheng Wei Yi-Xuan Wang Dong-Ying Huo Peng-Qi Zhang Ming Li Jun Ma Kang Wu Yong-Guang Zheng Yuan He Zhi-Yong Deng Tian-Zhi Jiang Xiang-Lin Zhuo Jin Li Yun Zhang Yu Zhang Jun-Run Wang Xiao-Dong Su Ze-En Yao School of Nuclear science and Technology Lanzhou UniversityLanzhou 730000China Engineering Research center for Neutron Application Technology Ministry of EducationLanzhou UniversityLanzhou 730000China moe frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China School of Mathematics and Statistics Lanzhou UniversityLanzhou 730000China Nuclear Power Institute of China Chengdu 610000China

Fission fragments yields and average total kinetic energy are fundamental nuclear data for nuclear energy applications and the study of nuclear *** fission products,such as ^(95)Zr,^(99)Mo,^(140)Ba,^(144)Ce,and ^(147)Nd,serve as burnup monitors,assessing the number of fissions induced by neutrons on ^(235)***,current experimental data for these fission products worldwide are inconsistent,introducing significant uncertainty into related scientific *** this study,we employed the Potential-driving Model to calculate the independent yields of ^(235)U and evaluate its advantages in such ***,we investigated the energy dependence of independent yields to select important ***,we calculated the cumulative yields of ^(95)Zr,^(99)Mo,^(140)Ba,^(144)Ce,and ^(147)Nd,and compared them with existing literature data to explore the energy dependence of fission products for ^(235)*** the lack of fission product yield data above 14.8 MeV,we extended our calculated incident neutron energy to 20 MeV,aiming to support future scientific *** Geant4 physical model does not consider the influence of incident neutron energy on the average total kinetic energy of fission fragments;thus,we introduced the excitation function of the total kinetic energy of fission fragments recommended by Madland et al.,which effectively describes the experimental data of the average total kinetic energy of fragments formed in ^(235)U *** this paper,we comprehensively discuss the energy dependence of fission product yields and average total kinetic energy.

关键词： ^(235)U(n f) potential-driving model fission yields kinetic energies energy dependence

Critical Opalescence and Its Impact on the Jet Quenching Parameter ■

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Chinese Physics Letters 2024年第3期41卷 28-34页

作者：武警曹杉杉李峰 School of Physical science and Technology Lanzhou University Institute of Frontier and Interdisciplinary science Shandong University Research center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS Lanzhou center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare Isotopes Lanzhou University frontiers science center for rare isotopes Lanzhou University

Jet quenching parameter ■ is essential for characterizing the interaction strength between jet partons and nuclear matter. Based on the quark-meson model, we develop a new framework for calculating ■ at finite chemi...

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New strategies for asymmetric photocatalysis: asymmetric organocatalytic/photoredox relay catalysis for efficient synthesis of polycyclic compounds containing vicinal amino alcohols

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science China Chemistry 2024年第3期67卷 945-952页

作者： Jia-Lu Zhang Wen-Bo He Xiu-Qin Hu Peng-Fei Xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Veterinary Etiological Biology College of Veterinary MedicineLanzhou UniversityLanzhou Veterinary Research InstituteChinese Academy of Agricultural SciencesLanzhou 730000China moe frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China

An asymmetric catalytic strategy in photocatalysis utilizing a chirality-induced approach through an organocatalytic/photoredox relay catalysis strategy is successfully achieved for the rapid construction of polycyclic compounds containing vicinal amino alcohols in a one-pot protocol. This methodology facilitates the efficient synthesis of diverse substituted polycyclic tetrahydroquinoline and benzofuran-derived vicinal amino alcohols, each containing five consecutive chiral centers, with high yields,excellent diastereoselectivities and enantioselectivities(up to 95% yield, >20:1 dr and 98% ee), under mild reaction conditions driven by sequential bifunctional squaramide organocatalyst-catalyzed [4+2] annulation and photocatalyst-catalyzed ketyl radical addition cyclization reaction process. Furthermore, investigations into the stereoselectivity mechanism and high-resolution mass spectrometry(HRMS) experiments on free radical trapping have provided evidence for elucidating the detailed mechanism of chirality-induced processes and chiral intermediate conversions in this procedure.

关键词： enantioselective photocatalysis asymmetric organocatalytic/photocatalysis relay catalysis five consecutive chiral centers chirality-induced strategy chirality vicinal amino alcohols

Analysis of Strong Coupling Constant with Machine Learning and Its Application

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Chinese Physics Letters 2024年第3期41卷 15-22页

作者：王晓云董晨刘翔 Department of Physics Lanzhou University of TechnologyLanzhou 730050China Lanzhou center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu ProvinceLanzhou UniversityLanzhou 730000China School of Physical science and Technology Lanzhou UniversityLanzhou 730000China Research center for Hadron and CSR Physics Lanzhou University and Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China moe frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China Key Laboratory of Quantum Theory and Applications of moe Lanzhou UniversityLanzhou 730000China

We investigate the nature of the strong coupling constant and related *** the analysis of accumulated experimental data around the world,we employ the ability of machine learning to unravel its physical *** result of our efforts is a formula that captures the expansive panorama of the distribution of the strong coupling constant across the entire energy range.

关键词： Strong coupling accumulated

Λ_(b)→Λ_(c) form factors from QCD light-cone sum rules

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Chinese Physics C 2022年第11期46卷 154-167页

作者： Yan Miao Hui Deng Ke-Sheng Huang Jing Gao Yue-Long Shen College of Physics and Photoelectric Engineering Ocean University of ChinaQingdao 266100China School of Nuclear science and Technology and Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China School of Physics Nankai UniversityTianjin 300071China

In this study,we calculate the transition form factors of Λ_(b) decaying into Λ_(c) within the framework of light-cone sum rules with the distribution amplitudes(DAs)of the Λ_(b)-*** the hadronic representation of the correlation function,we isolate both the Λ_(c) and Λ_(c)^(∗) states so that the Λ_(b)→Λ_(c) form factors can be obtained without *** investigate the P-type and A-type currents to interpolate light baryons for comparison because the interpolation current for the baryon state is not *** also employ three parametrization models for the DAs of Λ_(b) in the numerical *** present the numerical predictions for the Λ_(b)→Λ_(c) form factors and branching fractions,averaged forward-backward asymmetry,averaged final hadron polarization,and averaged lepton polarization of the Λ_(b)→Λ_(c)ℓμ decays,as well as the ratio of the branching ratios RΛ_(c).The predicted RΛ_(c) is consistent with LHCb data.

关键词： heavy baryon decays form factors light-cone sum rules

Opportunities and challenges of high-pressure ion exchange chromatography for nuclide separation and enrichment

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Chinese Chemical Letters 2022年第7期33卷 3413-3421页

作者： Weixiang Xiaob Duoqiang Pan Zhiwei Niu Yang Fan Sirui Wu Wangsuo Wu frontiers science center for rare isotopes Lanzhou UniversityLanzhou 730000China School of Nuclear science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou 730000China

With the rapid development of the nuclear industry,more-stringent requirements are proposed for highlevel radioactive waste liquid treatment and the enrichment of isotope ***-pressure ion exchange chromatography has been widely accepted for the fine separation of elements and nuclides due to its advantages,such as high efficiency,environmental friendliness,ease of operation,and feasibility for large-scale industrial ***,we summarized the evolution of high-pressure ion exchange chromatography and the relevant research progress in ion exchange equilibrium and related separation *** prospects for application of high-pressure ion exchange chromatography to rare earth elements,actinide elements and isotope separation were ***-pressure ion exchange chromatography represents a promising strategy for the extraction of rare earth elements and actinide elements from high-level radioactive waste liquid,as well as being an effective method for the automated production of high purity isotope products with great environmental benefits.

关键词： High-pressure ion exchange Chromatography Nuclide Separation Enrichment