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Possibilities for the synthesis of superheavy element Z=121 in fusion reactions

Nuclear science and Techniques 2024年第6期35卷 90-100页

作者： Ming-Hao Zhang Yu-Hai Zhang Ying Zou Xiu-Xiu Yang Gen Zhang Feng-Shou Zhang The Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China School of Physical Science and Technology Guangxi UniversityNanning 530004China National Laboratory of Heavy Ion Accelerator of Lanzhou Center of Theoretical Nuclear PhysicsLanzhou 730000China

Based on the dinuclear system model,the calculated evaporation residue cross sections matched well with the current experimental *** synthesis of superheavy elements Z=121 was systematically studied through combinations of stable projectiles with Z=21-30 and targets with half-lives exceeding 50 *** influence of mass asymmetry and isotopic dependence on the projectile and target nuclei was investigated in *** reactions^(254)Es(^(46)Ti,3n)^(297)121 and^(252)Es(^(46)Ti,3n)^(295)121 were found to be experimentally feasible for synthesizing superheavy element Z=121,with maximal evaporation residue cross sections of 6.619 and 4.123 fb at 219.9 and 223.9 MeV,respectively.

关键词： Superheavy nuclei Dinuclear system model Fusion reaction Evaporation residue cross section

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Synchrotron x-ray diffraction study of inversion symmetry breaking in bulk black phosphorus

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Physical Review B 2025年第16期111卷 L161407-L161407页

作者： Yongsam Kim In Kee Park D. ChangMo Yang Duck Young Kim Geunsik Lee Namdong Kim Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang Gyeongbuk 37673 Korea Department of Chemistry Ulsan National Institute of Science and Technology Ulsan 44919 Korea Department of Energy Science Sungkyunkwan University Suwon 16419 Korea Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China

X-ray diffraction study of black phosphorus (BP) shows forbidden reflections, which imply a broken inversion symmetry with atomic distortion in the orthorhombic lattice. The unexpected distortion occurs throughout the entire bulk crystal, rather than being confined to just the top-surface layer. Thus our observation suggests that this distortion is an intrinsic bulk property, in contrast to earlier studies which attributed the distortion to surface effects or defects. Our diffusion quantum Monte Carlo calculation predicts the same asymmetric structure. Density functional theory calculation incorporating Hubbard correction attributes the symmetry breaking to intrinsic electronic interaction in sp hybridized orbitals. We propose that the asymmetric lattice distortion in BP could enable stable two-dimensional ferroelectricity.

关键词： Crystal symmetry

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Possibility of reaching the predicted center of the“island of stability”via the radioactive beam-induced fusion reactions

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Nuclear science and Techniques 2024年第9期35卷 186-195页

作者： Ming-Hao Zhang Ying Zou Mei-Chen Wang Gen Zhang Qing-Lin Niu Feng-Shou Zhang The Key Laboratory of Beam Technology of Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China School of Physical Science and Technology Guangxi UniversityNanning 530004China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Based on the dinuclear system model,the synthesis of the predicted double-magic nuclei^(298)Fl and 304120 was investigated via neutron-rich radioactive beam-induced fusion *** reaction^(58)Ca+^(244)Pu is predicted to be favorable for producing^(298)Fl with a maximal ER cross section of 0.301 *** of the entrance channel effect reveal that the^(244)Pu target is more promising for synthesizing^(298)Fl than the neutron-rich targets^(248)Cm and^(249)Bk,because of the influence of the Coulomb *** the synthesis of 304120,the maximal ER cross section of 0.046 fb emerges in the reaction^(58)V+^(249)Bk,indicating the need for further advancements in both experimental facilities and reaction mechanisms.

关键词： Superheavy nuclei Dinuclear system model Fusion reaction Double-magic nucleus Radioactive beam

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Structural basis of DNA binding by the NAC transcription factor ORE1,a master regulator of plant senescence

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Plant Communications 2023年第3期4卷 139-150页

作者： Inseop Chun Hyo Jung Kim Sunghyun Hong Yeon-Gil Kim Min-Sung Kim Department of Life Sciences Pohang University of Science and Technology(POSTECH)PohangGyeongbukRepublic of Korea Center for Plant Aging Research Institute for Basic ScienceDaeguRepublic of Korea Center for Genome Engineering Institute for Basic ScienceDaejeonRepublic of Korea Pohang Accelerator Laboratory Pohang University of Science and TechnologyPohangRepublic of Korea

Plants use sophisticated mechanisms of gene expression to control senescence in response to environmental stress or ***1(Arabidopsis thaliana NAC092)is a master regulator of senescence that belongs to the plant-specific NAC transcription factor protein ***1 has been reported to bind to multiple DNA targets to orchestrate leaf senescence,yet the mechanistic basis for recognition of the cognate gene sequence remains ***,we report the crystal structure of the ORE1-NAC domain alone and its DNA-binding *** structure of DNA-bound ORE1-NAC revealed the molecular basis for nucleobase recognition and phosphate backbone *** showthat local versatility in the DNA-binding site,in combination with domain flexibility of the ORE-NAC homodimer,is crucial for the maintenance of binding to intrinsically flexible *** results provide a platformfor understanding other plant-specific NAC protein-DNA interactions as well as insight into the structural basis of NAC regulators in plants of agronomic and scientific importance.

关键词： NAC transcription factor crystal structure DNA complex senescence regulator

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Production of unknown neutron-deficient isotopes with Z=99-106 in multinucleon transfer reaction^(124)Xe+^(249)Cf

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Nuclear science and Techniques 2025年第3期36卷 95-104页

作者： Na Tang Si-Ying Ma Rong An Jing-Jing Li Feng-Shou Zhang School of Physics Ningxia UniversityYinchuan 750021China School of Physics and Astromony College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Beam Technology of Ministry of Education Institute of Radiation TechnologyBeijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The dinuclear system approach,coupled with the statistical decay model GEMINI++,was used to investigate multinucleon transfer *** production cross-sections in the reaction^(129)Xe+^(248)Cm were reproduced to assess the reliability of these theoretical *** production of neutron-deficient transcalifornium nuclei with Z=99-106 was examined in multinucleon transfer reactions,including^(124)Xe+^(248)Cm,^(124)Xe+^(249)Cf,and^(129)Xe+^(249)*** the driving potential and the neutron-to-proton equilibration ratio were found to dominate the nucleon transfer *** reaction^(124)Xe+^(249)Cf is proposed as a promising projectile-target combination for producing neutron-deficient isotopes with Z=99-106,with the optimal incident energy identified as E_(c.m.)=533.64 *** cross-sections of 25 unknown neutron-deficient trancalifornium isotopes with cross-sections greater than 1 pb were predicted.

关键词： Multinucleon transfer reaction Dinuclear system Unknown neutron-deficient isotopes with Z=99-106

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Investigation of multinucleon transfer processes in the Langevin equation model

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Nuclear science and Techniques 2024年第10期35卷 180-187页

作者： Ying Zou Ming-Hao Zhang Mei-Chen Wang Yu-Hai Zhang Feng-Shou Zhang The Key Laboratory of Beam Technology of Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

Multinucleon transfer in low-energy heavy-ion collisions is increasingly considered a promising approach for generating exotic *** the complex mechanisms involved in multinucleon transfer processes presents significant challenges for the theoretical investigation of nuclear reactions.A Langevin equation model was developed and employed to investigate multinucleon transfer ***^(40)Ar+^(232)Th reaction was simulated,and the calculated Wilczyński plot was used to verify the ***,to study the dynamics of multinucleon transfer reactions,the^(136)Xe+^(238)U and^(136)Xe+^(209)Bi reactions were simulated,and the corresponding TKE-mass and angular distributions were computed to analyze the energy dissipation and scattering *** investigation enhances our understanding of the dynamics involved in multinucleon transfer processes.

关键词： Reaction mechanisms Multinucleon transfer reactions Langevin equations Wilczyński plot Exotic nuclei

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New quantification of symmetry energy from neutron skin thicknesses of^(48)Ca and^(208)Pb

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Nuclear science and Techniques 2024年第10期35卷 188-196页

作者： Rong An Shuai Sun Li-Gang Cao Feng-Shou Zhang School of Physics Ningxia UniversityYinchuan 750021China Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Key Laboratory of Beam Technology of the Ministry of Education Institute of Radiation TechnologyBeijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of the Heavy Ion Accelerator of LanzhouLanzhou 730000China

Precise knowledge of the nuclear symmetry energy can be tentatively calibrated using multimessenger *** neutron skin thickness of a heavy nucleus is one of the most sensitive indicators for probing the isovector components of effective interactions in asymmetric nuclear *** studies have suggested that the experimental data from the CREX and PREX2 collaborations are not mutually compatible with existing nuclear *** this study,we review the quantification of the slope parameter of the symmetry energy L from the neutron skin thicknesses of^(48)Ca and^(208)*** energy density functionals classified by various isoscalar incompressibility coefficients K were employed to evaluate the bulk properties of finite *** calculated results suggest that the slope parameter L deduced from^(208)Pb is sensitive to the compression modulus of symmetric nuclear matter,but not that from^(48)*** effective parameter sets classified by K=220 MeV can provide an almost overlapping range of L from^(48)Ca and^(208)Pb.

关键词： Nuclear symmetry energy Neutron skin thickness Energy density functional

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Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch

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Light(science & Applications) 2024年第5期13卷 823-834页

作者： Kai Huang Zhan Jin Nobuhiko Nakanii Tomonao Hosokai Masaki Kando Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)KyotoJapan. Laser Accelerator R&D Innovative Light Sources DivisionRIKEN SPring-8 CenterHyogoJapan. SANKEN Osaka UniversityOsakaJapan

Laser wakefield acceleration,as an advanced accelerator concept,has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron *** three-dimensional(3D)density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an *** its significance,this parameter has not been experimentally measured in the investigation of laser wakefield *** report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the *** 3D shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic *** 3D structures to a few micrometer levels were reconstructed using a genetic *** electron bunch possessed a transverse size of less than 30 *** current profile shows a multi-peak *** main peak had a duration of<10 fs and a peak current>1 *** maximum electron 3D number density was~9×10^(21)m^(-3).This research demonstrates a feasible way of 3D density monitoring on femtosecond kilo-ampere electron bunches,at any position of a beam transport line for relevant applications.

关键词： laser acceleration field

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New insight into the exotic states strongly coupled with the DD^(*)from the T_(cc)^(+)

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science Bulletin 2024年第19期69卷 3036-3041页

作者： Guang-Juan Wang Zhi Yang Jia-Jun Wu Makoto Oka Shi-Lin Zhu KEK Theory Center Institute of Particle and Nuclear Studies(IPNS)High Energy Accelerator Research Organization(KEK)Tsukuba 305-0801Japan School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Physical Sciences University of Chinese Academy of Sciences(UCAS)Beijing 100049China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Advanced Science Research Center Japan Atomic Energy AgencyTokai 319-1195Japan Nishina Center for Accelerator-Based Science RIKENWako 351-0198Japan School of Physics and Center of High Energy Physics Peking UniversityBeijing 100871China

We have investigated the internal structure of the open-and hidden-charmed(DD^(*)/DD^(*))molecules in the unified *** first fit the experimental lineshape of the Tt state and extract the DD^(*)interaction,from which the T is assumed to arise *** we obtain the DD^(*)interaction by charge *** results show that the DD*interaction is attractive but insufficient to form X(3872)as a bound ***,its formation requires the crucial involvement of the coupled channel effect between the DD^(*)and cc components,although the cc accounts for approximately 1%*** X(3872),we have obtained a higher-energy state around 3957.9 MeV with a width of 16.7 MeV,which may be a potential candidate for the X(3940).In J^(PC)=1^(+-)sector,we have found two states related to the iso-scalar X(3872)and h_(c)(2P),*** combined study provides valuable insights into the nature of these DD^(+)/DD^(+)exotic states.

关键词： Quark model Charmonium(-like)states Coupled-channel effect Exotic hadrons

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Neutron skin thickness of ^(90)Zr and symmetry energy constrained by charge exchange spin-dipole excitations

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Chinese Physics C 2023年第2期47卷 123-128页

作者：程诗慧温静曹李刚张丰收 The Key Laboratory of Beam Technology and Energy Material College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The charge exchange spin-dipole(SD) excitations of ^(90)Zr are studied using the Skyrme Hartee-Fock plus proton-neutron random phase approximation with SAMi-J *** experimental value of the model-independent sum rule obtained from the SD strength distributions of ^(90)Zr(p,n) ^(90)Nb and ^(90)Zr(n,p) ^(90)Y is used to deduce the neutron skin *** neutron skin thickness Δr_(np) of ^(90)Zr is extracted as 0.083±0.032 fm,which is similar to the results of other *** on the correlation analysis of the neutron skin thickness Δr_(np) and the nuclear symmetry energy J as well as its slope parameter L,a constraint from the extracted Δr_(np) leads to the limitation of J to 29.2±2.6 MeV and L to 53.3±28.2 MeV.

关键词： neutron skin symmetry energy charge exchange spin-dipole excitations proton-neutron random phase approximation

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