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Passive neutron multiplicity device for^(240)Pu measurement based on FPGA

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nuclear science and Techniques 2024年第9期35卷 141-154页

作者： Yan Zhang Hao-Ran Zhang Ren-Bo Wang Ming-Yu Li Rui Chen Hai-Tao Wang Xiang-Ting Meng Shu-Min Zhou Bin Tang Fundamental science on Radioactive Geology and Exploration Technology Laboratory East China University of TechnologyNanchang 330013China Engineering Research Center for nuclear Technology Application Ministry of EducationEast China University of TechnologyNanchang 330013China Pan china Detect Technology Co.Ltd. Nanchang 330013China

A passive neutron multiplicity measurement device,FH-NCM/S1,based on field-programmable gate arrays(FPGAs),is developed specifically for measuring the mass of plutonium-240(^(240)Pu)in mixed oxide ***-NCM/S1 adopts an inte-grated approach,combining the shift register analysis mode with the pulse-position timestamp mode using an *** optimal effective length of the^(3)He neutron detector was determined to be 30 cm,and the thickness of the graphite reflector was ascertained to be 15 cm through MCNP *** fabricating the device,calibration measurements were per-formed using a^(252)Cf neutron source;a detection efficiency of 43.07%and detector die-away time of 55.79μs were *** samples of plutonium oxide were measured under identical conditions using the FH-NCM/S1 in shift register analysis mode and a plutonium waste multiplicity *** obtained double rates underwent corrections for detection efficiency(ε)and double gate fraction(f_(d)),resulting in corrected double rates(D_(c)),which were used to validate the accuracy of the shift register analysis ***,the device exhibited fluctuations in the measurement results,and within a single 20 s measurement,these fluctuations remained below 10%.After 30 cycles,the relative error in the mass of^(240)Pu was less than 5%.Finally,correlation calculations confirmed the robust consistency of both measurement *** study holds specific significance for the subsequent design and development of neutron multiplicity devices.

关键词： Spent fuel Non-destructive assay Neutron multiplicity ^(240)Pu FPGA

Theoretical and experimental design in the study of sulfide-based solid-state battery and interfaces

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Chinese Chemical Letters 2024年第2期35卷 242-251页

作者： Hongjie Xu Yujie Su Chenggong Zheng Yuchen Wang Yuping Tong Zhongzheng Yang Junhua Hu School of Materials science and Engineering North China University of Water Resources and Electric PowerZhengzhou 450046China School of Materials science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Titanium Based Advanced Materials Industrial Research Institute Jiaozuo 454191China

In recent years,due to the increasing demand for portable electronic devices,rechargeable solid-state battery technology has developed ***-ion batteries are the systems of choice,offering high energy density,flexible and lightweight design,and longer lifespan than comparable battery ***,a better understanding of the relationship between electrochemical mechanism and structural properties from theory and experiment will enable us to accelerate the development of high-performance and security *** review discusses the interplay between theoretical calculation and experiment in the study of lithium ion battery *** introduce the application of theoretical calculation method in solid-state batteries through the combination of theory and *** present the concept and assembly technology of solid-state batteries are *** basic parameters of solid-state electrolytes,especially sulfide-based solid-state electrolytes and their interface mechanisms with high-voltage cathode materials,are analyzed by theoretical *** present an overview on the scientific challenges,fundamental mechanisms,and design strategies for solid-state batteries,especially focusing on the issues of stability on solid-state electrolytes and the associated interfaces with both cathode and *** to the theoretical models,we can not only reveal the unprecedented mechanism from the atomic scale,but also analyze the interface problems in the battery thoroughly,thus effectively designing more promising electrolyte and interface coating *** blazed a new trial for engineering an interphase with improved interfacial compatibility for a long-term cyclability.

关键词： Theoretical simulation Sulfide-based electrolytes All solid-state battery Cathode-electrolyte interface Interface compatibility

Pion and Kaon Production in Heavy-Ion Reactions at 1GeV/Nucleon

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Chinese Physics Letters 1996年第10期13卷 730-733页

作者： ZHENG Yu-ming CHU Zi-li china Institute of Atomic Energy Beijing 102413

The pion and kaon production in heavy-ion reactions at 1GeV/nucleon has been investigated in the relativistic Vlasor-Uehling-Uhlenbeck model, which has been generalized to include the effect of nuclear medium on kaon and pion. The calculated results show that the attractive pion optical potential not only enhances apparently the yield of pions with low transverse momenta, leading to a reasonable fit to the experimental data, but also increases the kaon abundance.

关键词： attractive transverse ion.

Superdeformed Bands in ^(167)Lu and ^(171)Ta

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Chinese Physics Letters 1997年第1期14卷 17-19页

作者： WU Xiao-guang YANG Chun-xiang ZHENG Hua LIU Xiang-an SHEN Cai-wan CHEN Yong-shou MA Ying-jun LU Jing-bin WEN Shu-xian LI Guang-sheng LI Sheng-gang YUAN Guan-jun WENG Pei-kun LIU Yun-zuo china Institute of Atomic Energy Beijing 102413 Department of Physics Jilin UniversityChangchun 130023

High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton 1/2^(+)[660] *** new band and the 1/2^(+)[660] band in ^(171)Ta from the early work are classified as superdeformed bands with triaxiality.

关键词： energy. weakly

Band structure of superdeformed bands in odd-A Hg nuclei

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science china Mathematics 1997年第4期40卷 400-407页

作者：陈星渠邢正 Department of Modern Physics Lanzhou University Lanzhou 730000 China

Through particle-rotor model, band structure of superdeformed bands in odd-A Hg nuclei is analysed. An overall and excellent agreement between the calculated and observed kinematic and dynamic moments of inertia is obtained. The electromagnetic transition properties of SD bands can be used to identify the configuration with certainty.

关键词： nuclear structure superdeformed bands particle-rotor model electromagnetic transition.

Crystal structures and thermal expansion properties of Y_(2-x)Er_xMo_4O_(15) (x=0.0-2.0) solid solutions

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Rare Metals 2007年第5期26卷 426-434页

作者： YU Zhouxiang CHEN Dongfeng WANG Hui PENG Jie CHENG Yingzhi WU Meimei HU Zhongbo china Institute of Atomic Energy Beijing 102413 China College of Chemistly and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing 100049 China

A new series of rare earth compounds,Y2-xErxMo4O15 （x=0.0-2.0）,were synthesized and their structures were determined by powder X-ray diffraction （XRD）. Rietveld analysis of XRD patterns reveals that the compounds of this series crystallize in monoclinic system with space group P21/c. The lattice parameters a,b,c,β and the unit cell volume V de-crease linearly with increasing Er content. The thermal expansion properties of these compounds were studied under high-temperature XRD. Positive thermal expansions of compounds Y2-xErxMo4O15 are found to be anisotropic along the three crystallographic directions where a and c axes expand while b axis contracts in the whole temperature range. By analysis of data,the expansion of weak band Mo2-O14 with rising temperature should be responsible for positive thermal expansion.

关键词： thermal expansion crystal structure molybdate XRD

Description of Superdeformed Triaxial Band in ^(163)Lu

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Chinese Physics Letters 1998年第3期15卷 170-172页

作者： XING Zheng WANG Zi-Xing CHEN Xing-qu Department of Modern Physics Lanzhou UniversityLanzhou 730000 Institute of nuclear Research Chinese Academy of SciencesShanghai 201800

Using triaxial-particle-rotor model,theγ-transition energies,kinematic and dynamic moments of inertia and the transition quadrupole moments forπ[6601/2]band in ^(163)Lu are calculated and compared with the observed ... 详细信息

关键词： moments inertia

High-Spin States in the Odd-Proton Nucleus ^(135)pm

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Chinese Physics Letters 2001年第1期18卷 30-32页

作者： WENG Pei-Kun YUAN Guan-Jun ZHANG Zhan-Jun LI Sheng-Gang WEN Shu-Xian LI Guang-Sheng DAI Zheng-Yu YANG Chun-Xiang PENG Zhao-Hua LIU Xiang-An WU Xiao-Guang PU Yun-Wei china Institute of Atomic Energy Beijing 102413

High-spin states in the odd-proton nucleus^(135)pm have been investigated using the^(107)Ag(^(32)S,2p2n)^(135)pm *** rotational bands have been observed in^(135)*** yrast band based on a decoupled h_(11/2)proton is found to have a band crossing in ω_(c)~0.43 MeV/*** positive-parity bands based on the two signature components of the πg_(7/2)5/2^(+)[413]Nilsson orbital have been observed in the main *** favoured band with(π,α)=(+,1/2)has been shown to populate below the first pair of proton *** bands have shown upbend at ω_(1)~0.26 MeV/h and ω_(2)~0.43 MeV/*** crossing frequencies can be attributed to the decoupling of the first pair of h_(11/2) quasi-proton and h_(11/2) quasi-neutron,*** weaker bands have been observed in sidebands *** them,two states are possibly built on aπd_(5)/23/2^(+)[411]configuration.

关键词： reaction bands

High Spin States and Signature Inversion in ^(84)Rb

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Chinese Physics Letters 1999年第7期16卷 487-489页

作者： HAN Guang-bing WEN Shu-xian WU Xiao-guang LIU Xiang-an LI Guang-sheng YUAN Guan-jun PENG Zhao-hua WENG Pei-kun YANG Chun-xiang MA Ying-jun LU Jing-bin china Institute of Atomic Energy Beijing 102413 Department of Physics Jilin UniversityChangchun 130023

High-spin states in^(84)Rb have been studied by using the^(70)Zn(^(18)O,p3n)^(84)Rb reaction at a beam energy of 75 ***γ-γcoincidence,excitation function and ratios for directional correlation of oriented states were performed.A new level scheme was established in which the positive and negative parity bands have been extended up to 17^(+)and 17^(-)with excitation energy about *** signature splitting and signature inversion of the positive parity yrast bands were observed and are discussed.

关键词： excitation bands signature