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Inner fission barriers of uranium isotopes in the deformed relativistic Hartree-Bogoliubov theory in continuum

Chinese physics C 2024年第10期48卷 214-221页

作者： Wei Zhang Jin-Ke Huang Ting-Ting Sun Jing Peng Shuang-Quan Zhang School of Physics Zhengzhou UniversityZhengzhou 450001China Department of Physics Beijing Normal UniversityBeijing 100875China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

The inner fission barriers of the even-even uranium isotopes from the proton to the neutron drip line are examined using the deformed relativistic Hartree-Bogoliubov theory in continuum.A periodic-like evolution for the ground state shapes is shown with respect to the neutron number,i.e.,spherical shapes at shell closures 126,184,258,and prolate dominated shapes between *** to the shape evolution,the inner fission barriers also exhibit a periodic-like behavior:peaks at the shell closures and valleys in the *** triaxial effect on the inner fission barrier is evaluated using triaxial relativistic mean field calculations combined with a simple BCS method for *** the triaxial correction is included,the inner barrier heights show good consistency with available empirical ***,the evolution from the proton to the neutron drip line aligns with results from the multi-dimensionally constrained relativistic mean field theory.A flat valley in the fission barrier height is predicted around the neutron-rich nucleus U which may play a role of fission recycling in astrophysical r-process nucleosynthesis.

关键词： inner fission barrier potential energy curve triaxiality deformed relativistic Hartree-Bogoliubov theory in continuum

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Production and test of sPHENIX W/SciFiber electromagnetic calorimeter blocks in China

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nuclear Science and Techniques 2024年第8期35卷 167-176页

作者： Xiao‑Zhou Yu Xi‑Yang Wang Wei‑Hu Ma Shi‑Hong Fu Peng‑Fei Sun Jin‑Xing Song Wan‑Bing He Yang Shen Long Ma Jin‑Hui Chen Huan‑Zhong Huang Si‑Guang Wang Jing Zhou Xiao‑Mei Li Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Fudan UniversityShanghai 200433China Science and Technology on Nuclear Data Laboratory China Institute of Atomic EnergyBeijing 102413China Department of Physics and Astronomy University of CaliforniaLos AngelesCA 90095USA State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

The sPHENIX experiment is a new generation of large acceptance detectors at the relativistic heavy ion collider at Brookhaven National laboratory,with scientific goals focusing on probing the strongly interacting Quark–Gluon plasma with hard probes of jets,open heavy flavor particles,andγ*** EMCal detector,which covers the pseudo-rapidity region of|η|≤1.1,is an essential subsystem of *** this study,we focused on producing and testing EMCal blocks covering a pseudo-rapidity of|η|∈[0.8,1.1].These,in conjunction with the central pseudo-rapidity EMCal blocks,significantly enhance the sPHENIX physics capability of the jet andγparticle *** this paper,the detector module production and testing of sPHENIX W-powder/scintillating fiber(W/ScFi)electromagnetic calorimeter blocks are *** selection of the tungsten powder,mold fabrication,QA procedures,and cosmic ray test results are discussed.

关键词： sPHENIX Tungsten/scintillating fiber electromagnetic calorimeter Cosmic ray test

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Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

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Chinese physics B 2024年第1期33卷 545-553页

作者：程瑞锦李晓旬王清刘德基黄卓明吕帅宇周远志张舒童李雪铭陈祖杰王强刘占军曹莉华郑春阳 Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and Technologyand State Key Laboratory of Nuclear Physics and TechnologySchool of PhysicsPeking UniversityBeijing 100871China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China

A novel scheme to suppress both stimulated Brillouin scattering(SBS) and stimulated Raman scattering(SRS) by combining an alternating frequency(AF) laser and a transverse magnetic field is proposed. The AF laser allows the laser frequency to change discretely and alternately over time. The suppression of SBS is significant as long as the AF difference is greater than the linear growth rate of SBS or the alternating time of the laser frequency is shorter than the linear growth time of SBS. However, the AF laser proves ineffective in suppressing SRS, which usually has a much higher linear growth rate than SBS. To remedy that, a transverse magnetic field is included to suppress the SRS instability. The electrons trapped in the electron plasma waves(EPWs) of SRS can be accelerated by the surfatron mechanism in a transverse magnetic field and eventually detrapped. While continuously extracting energy from EPWs, the EPWs are dissipated and the kinetic inflation of SRS is suppressed. The one-dimensional particle-in-cell simulation results show that both SBS and SRS can be effectively suppressed by combining the AF laser with a transverse magnetic field with tens of Tesla. The total reflectivity can be dramatically reduced by more than one order of magnitude. These results provide a potential reference for controlling SBS and SRS under the related parameters of inertial confinement fusion.

关键词： stimulated Brillouin scattering stimulated Raman scattering alternating frequency laser transverse magnetic field

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Octupole correlations in stable nucleus ^(153)Eu within reflection-asymmetric particle rotor model

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Chinese physics C 2025年第1期49卷 216-222页

作者： Yuanyuan Wang Shuangquan Zhang Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Hebei Key Laboratory of Physics and Energy Technology North China Electric Power UniversityBaoding 071000China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

The observed low-lying K=5/2^(±) positive-and negative-parity bands in the stable nucleus ^(153)Eu are investigated using the reflection-asymmetric triaxial particle rotor *** experimental energy spectra,energy staggering parameters,and intraband E2 and M1 transition probabilities are well *** calculated interband B(E1)values are found to depend sensitively on the octupole deformation parameter β_(30),although the energy spectra and intraband E2 and M1 transitions can be reproduced without the octupole degree of *** observed enhanced E1 transition probabilities can be reproduced with β_(30)=*** detailed analysis of the intrinsic wave functions shows these nearly degenerate positive-and negative-parity bands are built on two individual proton configurations,i.e.,dominated by πg_(7/2)[Ω=5/2]and πh_(11/2)[Ω=5/2],respectively,which differs from the parity doublet bands built on a single parity-mixed configuration.

关键词： octupole correlations parity doublet bands electromagnetic transitions reflection-asymmetric triaxial particle rotor model

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Research progress and development tendency on storage mechanism of multi-principal element alloys for hydrogen/tritium storage

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Rare Metals 2024年第11期43卷 5549-5572页

作者： Yi-Jie Chen Jian-Wei Zhang Can-Hui Xu Mu-Hong Li Shuang-Lin Hu Yue-Xia Wang Xiao-Tao Zu Hai-Yan Xiao Xiao-Song Zhou Shu-Ming Peng Hua-Hai Shen Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE) Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Sustainable clean energy is gradually replacing traditional fossil energy sources in important industrial applications and is placing higher demands on the technologies of energy storage and *** development of multi-principal element alloys(MPEAs)offers a new idea for safe solid-state hydrogen storage *** to the unique characteristics of complex components and severe lattice distortion,MPEAs are predicted to have better hydrogen storage performance and more probability for modulation and enhancement,allowing them to meet the requirements of different hydrogen storage *** unique structure characteristic potentially devotes the improvement of thermodynamic and kinetic performance,such as the hydrogen storage capacity and hydrogen adsorption/desorption ***,several important modulation factors originating from components and structures facilitate the understanding of the correlation between hydrogen storage properties and ***,we highlight the correlations of hydrogen storage mechanism,with the degree of lattice distortion,the element variation or segregation and valence electron ***,the development tendency on the hydrogen storage mechanism based on the advanced microscopy and computational approach is ***,the chemically short-range ordered structure in MPEAs is predicted as a potential modification factor of the hydrogen/tritium storage properties.

关键词： Multi-principal element alloys(MPEAs) Hydrogen/Tritium storage Hydrogenation mechanism Development tendency Advanced microscopy

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Implications of neutron skin measurements on Skyrme equations of state

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Chinese physics C 2024年第6期48卷 155-161页

作者：管大为裴俊琛蒋崇基 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

The recent measurements of neutron skins via parity violation in electron scattering have extracted an abnormally thick neutron skin for 208 Pb,which has significant consequences in nuclear equation of state(EoS)and neutron star *** this study,we perform optimizations of extended Skyrme forces in a consistent manner by including neutron skin thicknesses from PREX-Ⅱand CREX experiments and investigate nuclear EoSs and neutron stars in the GW170817 event By varying the fitting weights of neutron skins,several new Skyrme parameterizations are *** results show the competition in the fitting procedure to simultaneously describe neutron skins,other properties of finite nuclei,and neutron star *** prospects of resolving neutron skin issues are also discussed.

关键词： neutron skin equation of state neutron star Skyrme force

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Two annular CsI(Tl) detector arrays for the charged particle telescopes

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nuclear Science and Techniques 2023年第10期34卷 158-165页

作者： Hong-Yu Zhu Jian-Ling Lou Yan-Lin Ye Li-Sheng Yang Bo-Long Xia Kang Wei Ying Chen Wei-Liang Pu Zi-Yao Hu Hao-Yu Ge Jia-Hao Chen Kai Ma Wen-Wu Wan Hooi-Jin Ong Yan-Yun Yang Shi-Wei Xu Kang Wang Fang-Fang Duan Jun-Bin Ma Zhen Bai Peng Ma Ruo-Fu Chen School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Institute of Modern Physics Chinese Academy SciencesLanzhou 730000China

In this study,we constructed two annular detector arrays comprising 24 wedge-shaped CsI(Tl) crystals,and tested them using anαsource and radioactive beams of ^(14-16) Con a CD_2 *** compared the properties of a CsI(Tl) crystal encapsulated with various reflectors,revealing that using the 80-μm-thick ESR film to pack the CsI(Tl) crystal yielded the largest light output with the smallest non-uniformity in light output (ΔLO).For the 24 CsI(Tl) detectors with the 80-μm-thick ESR films,the average energy resolution improved as the average light output increased;however,it deteriorated as theΔLO value *** form two annular Si-CsI(Tl) telescopes for identifying the light-charged particles,theΔLO value and energy resolution of each CsI(Tl) detector were maintained under 20%and 7.7%,*** telescopes were tested for the first time in a direct nuclear reaction experiment using ^(14-16) C+*** results demonstrated that the Z=1 and Z=2 charged particles were adequately discriminated by the telescopes using the standardΔE-E method.

关键词： Wedge-shaped CsI(Tl)detector Light output non-uniformity Si-CsI(Tl)telescope Particle identification

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Outstanding proton conductivity over wide temperature and humidity ranges and enhanced mechanical, thermal stabilities for surface-modiﬁed MIL-101-Cr-NH_(2)/Naﬁon composite membranes

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Green Energy & Environment 2024年第11期9卷 1734-1746页

作者： Xu Li Dongwei Zhang Si Chen Yingzhao Geng Yong Liu Libing Qian Xi Chen Jingjing Li Pengfei Fang Chunqing He Key Laboratory of Nuclear Solid-State Physics Hubei Province School of Physics and TechnologyWuhan UniversityWuhan430072China School of Nuclear Technology and Chemistry&Biology Hubei University of Science and TechnologyXianning437100China Guangdong Key Laboratory for Hydrogen Energy Technologies School of Materials Science and Hydrogen EnergyFoshan UniversityFoshan528000China

High-performance proton exchange membranes are of great importance for fuel ***,we have synthesized polycarboxylate plasticizer modiﬁed MIL-101-Cr-NH_(2)(PCP-MCN),a kind of hybrid metal-organic framework,which exhibits a superior proton ***-MCN nanoparticles are used as additives to fabricate PCP-MCN/Naﬁon composite *** and characteristics of PCP-MCN and these membranes have been extensively ***ﬁcant enhancement in proton conduction for PCP-MCN around 55℃ is interestingly found due to the thermal motion of the PCP molecular *** mechanical properties and higher thermal decomposition temperature of the composite membranes are directly ascribed to strong intermolecular interactions between PCP-MCN and Naﬁon side chains,i.e.,the formation of substantial acid–base pairs(-SO_(3)^(-)…^(+)H–NH-),which further improves compatibility between additive and Naﬁon *** the same humidity and temperature condition,the water uptake of composite membranes signiﬁcantly increases due to the incorporation of porous additives with abundant functional groups and thus less crystallinity degree in comparison to pristine Naﬁ*** conductivity(σ)over wide ranges of humidities(30-100%RH at 25℃)and temperatures(30-98℃ at 100%RH)for prepared membranes is *** s in PCPMCN/Naﬁon composite membranes is remarkably enhanced,i.e.0.245 S/cm for PCP-MCN-3wt.%/Naﬁon is twice that of Naﬁon membrane at 98℃ and 100%RH,because of the establishment of well-interconnected proton transport ionic water channels and perhaps faster protonation–deprotonation *** composite membranes possess weak humidity-dependence of proton transport and higher water uptake due to excellent water retention ability of *** particular,when 3 wt.%PCP-MCN was added to Naﬁon,the power density of a single-cell fabricated with this composite membrane reaches impressively 0.480,1.098 W/cm^(2) under 40%RH,100%RH at 60℃,respectively,guaranteei

关键词： Naﬁon composite membrane Surface-modiﬁed MIL-101-Cr-NH_(2) Proton conductivity Single-cell performance

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New measurement of 4^(H)e and proton decays from resonant states in^(19)Ne

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Chinese physics C 2023年第11期47卷 50-56页

作者：马凯叶沿林林承键陈家豪王东玺韩家兴贾会明杨磊阳黎升胡梓瑶陈莹蒲伟良李根谭智威黄大湖骆天鹏钟善豪楼建玲杨晓菲李智焕李奇特许金艳杨再宏魏康 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China China Institute of Atomic Energy Beijing 102413China College of Physics and Technology&Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China

A^(6)Li(^(16)O,^(19)Ne^(∗))^(3)H multi-nucleon transfer-reaction experiment was performed to populate the highly excited states in^(19)*** subsequent decay particles,^(4)He or protons from the^(19)Ne resonant states,were detected in coincidence with the recoil 3 *** excitation-energy spectra of^(19)Ne were reconstructed using the detected proton or^(4)He and the deduced^(18)F or^(15)O data,respectively.A broad resonance at about 7.85 MeV(1/2^(+))was observed,with partial decay widths different from the previously reported values,which may have a significant impact on the destruction of 18 F in astrophysical *** resonances up to very high excitation energies have been identified with a largeα-clustering strength,which confirm the formation of the cluster structure with a one-hole configuration in light nuclei and encourage further systematic studies of the cluster structure in^(19)Ne.

关键词： resonant state Q-value branch ratio partial decay width

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Revealing the signal of QCD phase transition in heavy-ion collisions

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Science China(physics,Mechanics & Astronomy) 2025年第5期68卷 101-112页

作者： Yi Lu Fei Gao Xiaofeng Luo Lei Chang Yuxin Liu State Key Laboratory of Nuclear Physics and Technology Department of PhysicsPeking UniversityBeijing 100871China School of Physics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Quark Lepton Physics(MOE) Institute of Particle PhysicsCentral China Normal UniversityWuhan 430079China School of Physics Nankai UniversityTianjin 300071China Center for High Energy Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

We propose a novel criterion to identify the first-order QCD phase transition and the critical end-point(CEP)via directly the netproton number fluctuations measured in relativistic heavy-ion collision(RHIC)*** this method,we show that there has not yet been a direct signal of the CEP of QCD according to the currently available data accumulated in the beam energy scan experiments with√^(S)_(NN)≥7.7 ***,there is still a possibility for the CEP to appear in the matter generated by the collisions with energy below 7.7 Ge V,and its identification requires future measurements with high statistics for the high-order cumulants at low collision energies.

关键词： QCD phase transition critical end-point baryon number fluctuations thermodynamic potential relativistic heavy-ion collisions

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