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Core breaking and possible magnetic rotation in the semimagic nucleus ^(90)Zr

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Chinese Physics C 2021年第9期45卷 180-187页

作者： Hao Wang ke-yan ma Si-Ying Liu Jing-Bin Lu College of Physics Jilin UniversityChangchun 130012China

The semimagic nucleus^(90)Zr,with Z=40 and N=50,is investigated in terms of large scale shell model calculations.A logical agreement is obtained between the available experimental data and predicted *** calculated results indicate that the low-lying states are primarily dominated by the proton excitations from the fp orbitals across the Z=38 or 40 sub shell into the high-j 1g_(9/2)*** the higher-spin states of^(90)Zr,the breaking of the N=50 core plays a crucial role,and the contribution of different orbitals to each state are discussed in this *** evolution from neutron core excitations to proton excitations is systematically studied along the neighboring N=50 ***,the strongΔI=1 sequence demonstrates an abrupt backbend attributed to the alignment of the valence nucleons in fp proton orbitals and is proposed to have aπ(fp)^(-2)(1g_(9/2))^(2)■v(1g_(9/2))^(-1)(2d_(5/2)/1g_(7/2))^(1)configuration before the backbend,based on the shell model *** properties of this sequence before the backbend indicate a general agreement with the fingerprints of magnetic rotation;hence,the sequence with theπ(fp)^(-2)(1g_(9/2))^(2)■v(1g_(9/2))^(-1)(2d_(5/2)/1g_(7/2))^(1) configuration is suggested as a magnetic rotational band arising from shears mechanism.

关键词： semimagic nucleus shell model core breaking magnetic rotation

A development of lifetime measurement based on the differential decay curve method

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Nuclear Science and Techniques 2018年第8期29卷 114-120页

作者： Jian Zhong Xiao-Guang Wu Ying-Jun ma Yun Zheng Cong-Bo Li Guang-Sheng Li Bao-Ji Zhu Tian-Xiao Li yan-Jun Jin yan-Xiang Gao ke-yan ma Dong yang Hao Guo Jia-Qi Wang Xian Guan Ji Sun China Institute of Atomic Energy Beijing 102413China College of Physics Jilin UniversityChangchun 621010China Shenyang Institute of Engineering Shenyang 110136China

A new development of indirect gating case in the differential decay curve method used for lifetime measurement has been *** gate region was extended from partial shifted peak to both shifted and unshifted *** statistics of flight and stop peaks in gating spectra was improved *** reliability of this change has been tested by reanalysing the lifetime of 2^+ state in^(134) *** result of 32.2(33) ps was fit well with the previous published values within the experimental *** developed method was also used to analyse the lifetime of 2_1^+ state in^(138) Nd.

关键词：线方法腐烂微分开发测量大小写可靠性试验性

Lifetime measurements in 138Nd

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Nuclear Science and Techniques 2021年第10期32卷 72-78页

作者： Jian Zhong Xiao-Guang Wu Shi-Peng Hu Ying-Jun ma Yun Zheng Cong-Bo Li Guang-Sheng Li Bao-Ji Zhu Tian-Xiao Li yan-Jun Jin yan-Xiang Gao Qi-Wen Fan ke-yan ma Dong yang Hui-Bin Sun Hai-Ge Zhao Lin Gan Qi Luo Zheng-Xin Wu College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China China Institute of Atomic Energy Beijing 102413China College of Physics Jilin UniversityChangchun 621010China

Lifetimes of the 2_(1)^(+),4_(1)^(+),7_(2)^(-),10_(2)^(+),12_(2)^(+),and 14_(1)^(+) states in 138 Nd populated via the 123 Sb(19 F,4n)138 Nd fusion–evaporation reaction were measured with the recoil distance Doppler shift technique in combination with the differential decay curve *** B(E2;2_(1)^(+)→0_(1)^(+))value fit well with the systematic trend in the Nd isotope chain and Grodzins rule,which proved that 138Nd is a transitional nucleus.

关键词： Lifetime measurement Recoil distance Doppler shift technique Differential decay curve method

Multi-quasiparticle excitations and the impact of the high-j intruder orbital in the N=51^93 Mo nucleus

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Chinese Physics C 2021年第1期45卷 208-214页

作者： Hao Wang ke-yan ma Yi-Heng Wu Yi-Feng Lv Hao-Nan Pan Jing-Bin Lu College of Physics Jilin UniversityChangchun 130012China School of Physics and Electronic Engineering An Qing Normal UniversityAnqing 246133China

The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated *** calculated results show that the lower-lying states are mainly dominated by proton excitations from the If5/2,2 p3/2,and 2 p1/2 orbitals into the higher orbitals across the Z=38 or Z=40 subshell *** the higher-spin states,multi-particle excitations,including the excitation of 2 d5/2 neutrons across the N=56 subshell closure into the high-j intruder 1 h11/2 orbital,are ***,the previously unknown spin-parity assignments of the six higher excited states in 93 Mo are inferred from the shell model calculations.

关键词： level structure shell model multi-particle excitation Mo

Morphology engineering of ZnO micro/nanostructures under mild conditions for optoelectronic application

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International Journal of Minerals,Metallurgy and materials 2025年第2期32卷 498-503页

作者： Liang Chu Haoyu Shen Hudie Wei Hongyu Chen Guoqiang ma Wensheng yan Institute of Carbon Neutrality and New Energy&School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China School of Applied Physics and materials Wuyi UniversityJiangmen 529020China

Zinc oxide(ZnO)serves as a crucial functional semiconductor with a wide direct bandgap of approximately 3.37 *** reaction is commonly used in the synthesis of ZnO micro/nanostructures,given its low cost,simplicity,and easy ***,ZnO morphology engineering has become desirable through the alteration of minor conditions in the reaction process,particularly at room *** this work,ZnO micro/nanostructures were synthesized in a solution by varying the amounts of the ammonia added at low temperatures(including room temperature).The formation of Zn^(2+)complexes by ammonia in the precursor regulated the reaction rate of the morphology engineering of ZnO,which resulted in various structures,such as nanoparticles,nanosheets,microflowers,and single ***,the obtained ZnO was used in the optoelectronic application of ultraviolet detectors.

关键词： morphology engineering low temperature ZnO nanosheets microflowers ultraviolet detector

Low-lying states of 92,93Nb excited in the reactions induced by the weakly-bound nucleus 6Li near the Coulomb barrier

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Chinese Physics C 2019年第10期43卷 69-77页

作者： Yi-Feng Lv Jing-Bin Lu Gao-Long Zhang Yi-Heng Wu Cen-Xi Yuan Guan-Jian Fu Guang-Xin Zhang Zhen Huang Ming-Li Wang Shi-Peng Hu Hui-Bin Sun Huan-Qiao Zhang Cheng-Qian Li ke-yan ma Ying-Jun ma Yun-Zuo Liu College of physics Jilin UniversityChangChun 130012China INFN Laboratori Nazionali di LegnaroLegnaro (Padova)Italy Irfu/CEA Universite de Paris-SaclayGif-sur-YvetteFrance School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine Beihang UniversityBeijing 100083China School of Physics and Electronic Engineering An Qing Normal UniversityAn qing246133China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Physics Science and Engineering Tongji UniversityShanghai 200092China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China China Institute of Atomic Energy Beijing 102413China Dipartimento di Fisica and INFN Sezione di PadovaPadovaItaly

Excited states of odd-odd nucleus 92Nb and odd-A nucleus 93Nb were populated in the 6 Li+ 89 Y reaction with an incident energy of 34 MeV. The processes that produce 92,93Nb and can be measured by a combination of light charged particle and gamma ray measurements are discussed. Twenty new transitions are observed and eight new levels are constructed in 92Nb, and in addition two new transitions are added to the level scheme of 93Nb. Using shell2 model calculations, the low-lying structure of 9 Nb is investigated and compared with the experimental results.

关键词： weakly-bound projectile coincidence measurement level structure odd-odd nucleus 92Nb odd-A nucleus 93Nb.

Lifetime measurement for the 2^+1 state in^106Cd

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Chinese Physics C 2020年第9期44卷 76-82页

作者： Jian Zhong Ying-Jun ma Xiao-Guang Wu Bao-Ji Zhu Cong-Bo Li Guang-Sheng Li Yun Zheng Qi-Ming Chen Chuang-Ye He Li-Tao Deng Wen-Kui Zhou ke-yan ma Dong yang Hao Guo Jia-Qi Wang Xian Guang Ji Sun Hui-Bin Sun Shi-Peng Hu Lin Gan Hai-Ge Zhao Qi Luo Zheng-Xin Wu College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China China Institute of Atomic Energy Beijing 102413China College of Physics Jilin UniversityChangchun 621010China

The lifetime of the 2^+1 state in ^106Cd populated via the ^94Zr(^16O,4n)^106Cd reaction has been measured with the Recoil Distance Doppler Shift technique in combination with the Differential Decay Curve *** subtracting the contamination in the data,the mean lifetime of the I^π=2^+1633 keV state was determined as 9.9(12)*** B(E2)value calculated in this study is in good agreement with the experimental systematics and was compared to the shell model calculations.

关键词： lifetime measurement the Differential Decay Curve Method experimental systematics

Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang Yuefeng yan Zhen Wang Guansheng ma Dechang Jia Xiaoxiao Huang Yu Zhou State key Laboratory of Precision Welding&Joining of materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT key Laboratory of Advanced Structural‑Functional Integration materials&Green manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching

The complex roles of m^(6)A modifications in neural stem cell proliferation, differentiation, and self-renewal and implications for memory and neurodegenerative diseases

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Neural Regeneration Research 2025年第6期20卷 1582-1598页

作者： yanxi Li Jing Xue Yuejia ma ke Ye Xue Zhao Fangliang Ge Feifei Zheng Lulu Liu Xu Gao Dayong Wang Qing Xia Department of Biochemistry and Molecular Biology College of Basic Medical SciencesHarbin Medical UniversityHarbinHeilongjiang ProvinceChina College of Basic Medical Sciences Harbin Medical UniversityHarbinHeilongjiang ProvinceChina Basic Medical Institute Heilongjiang Academy of Medical SciencesHarbinHeilongjiang ProvinceChina key Laboratory of Heilongjiang Province for Genetically Modified Animals Harbin Medical UniversityHarbinHeilongjiang ProvinceChina Translational Medicine Research and Cooperation Center of Northern China Heilongjiang Academy of Medical SciencesHarbinHeilongjiang ProvinceChina Dongzhimen Hospital Beijing University of Chinese MedicineBeijingChina

N6-methyladenosine(m^(6)A), the most prevalent and conserved RNA modification in eukaryotic cells, profoundly influences virtually all aspects of mRNA metabolism. mRNA plays crucial roles in neural stem cell genesis and neural regeneration, where it is highly concentrated and actively involved in these processes. Changes in m^(6)A modification levels and the expression levels of related enzymatic proteins can lead to neurological dysfunction and contribute to the development of neurological diseases. Furthermore, the proliferation and differentiation of neural stem cells, as well as nerve regeneration, are intimately linked to memory function and neurodegenerative diseases. This paper presents a comprehensive review of the roles of m^(6)A in neural stem cell proliferation, differentiation, and self-renewal, as well as its implications in memory and neurodegenerative diseases. m^(6)A has demonstrated divergent effects on the proliferation and differentiation of neural stem cells. These observed contradictions may arise from the time-specific nature of m^(6)A and its differential impact on neural stem cells across various stages of development. Similarly, the diverse effects of m^(6)A on distinct types of memory could be attributed to the involvement of specific brain regions in memory formation and recall. Inconsistencies in m^(6)A levels across different models of neurodegenerative disease, particularly Alzheimer's disease and Parkinson's disease, suggest that these disparities are linked to variations in the affected brain regions. Notably, the opposing changes in m^(6)A levels observed in Parkinson's disease models exposed to manganese compared to normal Parkinson's disease models further underscore the complexity of m^(6)A's role in neurodegenerative processes. The roles of m^(6)A in neural stem cell proliferation, differentiation, and self-renewal, and its implications in memory and neurodegenerative diseases, appear contradictory. These inconsistencies may be a

关键词： Alzheimer's disease cell self-renewal central nervous system memory microglia nerve regeneration neurodegenerative diseases neurogenesis RNA methylation