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A systematic study of the superdeformation of pb isotopes with relativistic mean field theory

Chinese Physics C 2008年第11期32卷 886-891页

作者：郭建友圣宗强方向正 School of Physics and Material Science Anhui University Department of Mathematics and Physics Anhui University of Science and Technology

The microscopically constrained relativistic mean field theory is used to investigate the superdeformation for pb isotopes. The calculations have been performed with the four different interactions NL3, PK1, TM1 and NLSH, and show that there exists a clear superdeformed minimum in the potential energy surfaces. The excitation energy, deformation and depth of the well in the *** minimum are comparable for the four different interactions. Furthermore the trend for the change of the superdeformed excitation energy with neutron number is correctly reproduced. The calculated two-neutron separation energy in the ground state and superdeformed minimum together with their differences are in agreement with the available data. The larger energy difference appearing in the superdeformed minimum reflects a lower average level density at superdeformations for pb isotopes.

关键词： pb isotopes superdeformation relativistic mean field theory

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Distribution of trace metals and pb isotopes in bottom sediments of the Murucupi River,North Brazil

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International Journal of Sediment Research 2016年第3期31卷 226-236页

作者： Diomar Cavalcante Oliveira Jean Michel Lafon Marcelo de Oliveira Lima Institute of Geosciences Federal University of Pára Environmental Section Evandro Chagas Institute

The Murucupi River belongs to the hydrographic network of the Para River estuary,at the southern portion of the Amazon River mouth,which consists of a fluvial-marine transitional zone under strong impact of both tidal and fluvial *** geochemical results obtained for bottom sediments from the Murucupi River,the Arrozal Channel,and the Para River indicate a natural variation of pb,Cr,Cu,Zn,and Ni content among these water ways with no significant anthropogenic *** to the threshold effects level(TEL),the contents of trace metals do not offer risk to the local *** contrast,the differences in the pb isotopic composition of sediments in the Murucupi River,the Arrozal Channel,and the Para River are *** isotopic signatures indicate an anthropogenic contribution of pb in the Murucupi River originating from the domestic effluents of urban centers;industrial waste represented by red mud is not *** results demonstrate that the pb isotopic signature is a prospective indicator for future contamination of bottom sediments by trace metals and is useful for identifying contaminants among the possible anthropogenic sources.

关键词： Bottom sediments pb isotopes Trace metals Murucupi River Barcarena

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Anomaly in the Charge Radii and Nuclear Structure

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Chinese Physics Letters 2006年第7期23卷 1723-1726页

作者：张鸿飞左维李君清 Soojae Im 马中玉陈宝秋 Institute of Modern Physics the Chinese Academy of Sciences Lanzhou 730000 Research Center of Nuclear Theory of Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 Graduate school of Chinese Academy of Sciences Beijing 100039 China Institute of Atomic Energy Beijing 102413

The axially deformed relativistic mean field theory is applied to study the isotope shift of charge distributions of odd-Z Pr isotope chain. The nuclear structure associated with the shell and the isotope effect is investigated. The mechanism of the kink in the isotope shift at the neutron magic number N = 82 is revealed to be dependent on the neutron energy level structure at the Fermi energy, demonstrating that the spin-orbit coupling interaction and p-n attraction are well described by the relativistic mean field theory.

关键词： MEAN-FIELD-THEORY DENSITY FUNCTIONAL-APPROACH ISOTOPE SHIFTS SUPERHEAVYNUCLEI FINITE NUCLEI pb isotopes

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Isotopic fingerprinting of dissolved iron sources in the deep western Pacific since the late Miocene

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Science China Earth Sciences 2020年第11期63卷 1767-1779页

作者： Ruolin LIU Bai GUO Maoyu WANG Weiqiang LI Tao YANG Hongfei LING Tianyu CHEN Center for Marine Geochemistry Research State Key Laboratory for Mineral Deposit ResearchSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Iron(Fe)is a productivity-limiting nutrient in the ***,the sources of dissolved Fe(dFe)in the deep ocean and how they respond to tectonic and climate changes are still poorly *** the northern hemisphere,dust flux to the low-latitude western Pacific has increased dramatically since the late Miocene associated with intense aridification of the Asian ***,the terrigenous material supply to the open ocean might have also changed as a result of the reorganization of the Pacific circulation due to the gradual closure of seaways in the low ***,the western Pacific is a characteristic region for understanding the sources of dFe in the deep ocean and their responses to long term climate ***,we present data on isotopic evolution of dFe and dissolved pb since^8 Ma based on ferromanganese crust METG-03(16.0°N,152.0°E,3850 m water depth)in the western Pacific deep *** results show thatδ56Fe of the crust remains fairly stable since the late Miocene,i.e.,about-0.32±0.08‰(2SD).We infer thatδ56Fe of dFe in the deep western Pacific is relatively invariant at^0.45±0.1‰based on the Fe isotopic fractionation between hydrogenetic crust and the seawater dissolved *** reconstructed isotope signature is similar to the measuredδ56Fe value(0.37±0.15‰)of the intermediate to deep waters in the modern low-latitude western Pacific region close to the island arcs,but is significantly higher than that of the eastern Pacific deep waters near South America which is controlled by the reductive dissolution of continental shelf sediments and the hydrothermal inputs(δ56Fepb/204pb ratio recorded by METG-03 displays systematic increase at about 8–4 Ma,reflecting increased input from sediment dissolution of low-latitude island arcs associated with reorganization of the western Pacific deep ***,Fe isotopes of terrigenous materials from different sources are similar,while their dissolved Fe isotop

关键词： Fe isotopes pb isotopes Western Pacific Source Miocene

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