Constraining nuclear symmetry energy with the charge radii of mirror-pair nuclei

The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear matter.Based on the correlation between the differences in charge radii of mirror-partner nuclei and the slope parameter(L)of symmetry energy at the nuclear saturation density,an analysis of the calibrated slope parameter L was performed in finite nuclei.In this study,relativistic and nonrelativistic energy density functionals were employed to constrain the nuclear symmetry energy through the available databases of the mirror-pair nuclei^(36)Ca–^(36)S,^(38)Ca–^(38)Ar,and ^(54)Ni–^(54)Fe.The deduced nuclear symmetry energy was located in the range 29.89–31.85 MeV,and L of the symmetry energy essentially covered the range 22.50–51.55 MeV at the saturation density.Moreover,the extracted L_(s) at the sensitivity density p_(s)=0.10 fm^(-3) was located in the interval range 30.52–39.76 MeV.

Theoretical Study of the Nuclear Charge Distributions of Tin Isotopes

Nuclear binding energies,charge radii and the charge distributions of even-even tin (Sn) isotopes are calculated using relativistic mean field theory,and the theoretical results are found to be in accordance with the experimental data.The nuclear charge form factors for Sn isotopes are calculated using the phase-shift analysis method.It is shown that the minima of the charge form factors shift upward and inward with an increase in the neutron number of the Sn isotopes.

Nuclear Hexadecapole Deformation Effects on the Production of Super-Heavy Elements

我们为导致超重元素的一些冷熔化反应在在原子核，开车潜力和熔化可能性之间的相互作用潜力上调查原子 hexadecapole 变丑的效果。原子 hexadecapole 变丑显著地为一些反应隧道改变开车潜力和熔化可能性的结构，这被发现。[从作者抽象]

Theoretical Calculation for Half-Lives of Spherical Proton Emitters

为球形的质子 emitters 的质子放射性的一半生活在 Wentzel-Kramers-Brillouin 近似理论上被调查。显微镜的质子原子核相互作用潜力被与重新使正常化的 M3Y 有效相互作用合拢剩余女儿原子核的密度获得。我们也在计算考虑分光镜的因素(Sp ) ，它用力量 NL3 在相对论的吝啬的域途径被评估。计算结果被发现在对试验性的数据的好同意。[从作者抽象]

Theoretical Study on Alpha-Decay Chains of 294 117 117 and 293 176 117

最新综合的元素 117 并且它的 alpha 腐烂链系统地与参数集合 NL-Z2 和 TMA 在相对论的吝啬的地理论的框架被调查。294117 和 293117 的 alpha 腐烂链上的超重原子核的地面状态性质是计算的。二 alpha 腐烂链的试验性的 alpha 腐烂精力和一半生活被模型相当复制。有约束力的精力， alpha 腐烂精力，一半生活，四极变丑，势能曲线，和二 alpha 腐烂链的单个粒子层次的详细讨论被做。

Theoretical study on decay of the 4d core-excited states of Cs Ⅲ

In a recent XUV photoabsorption spectrum of Cs Ⅲ ions by Cummings and O'Sullivan [2001 J. Phys. B 34 199], rather large linewidths were found for the 4d 9 5s 2 5p 6 4d 10 5s 2 5p 5 transition which are quite in disagreement with corresponding quasi-relativistic multiconfiguration Hartree-Fock (MCHF) calculation. In the present work, a detailed multiconfiguration Dirac-Fock study has been carried out to explore this discrepancy. Owing to the detailed consideration of electron correlation effects, some 'forbidden' Auger decay channels, such as 4d 10 5s 2 5p 3 5d and 4d 10 5s 0 5p 6 , would become 'open'. As a result, remarkable improvement of the linewidths has been obtained in our calculation. Furthermore, the theoretical Auger spectrum of the 4d 9 5s 2 5p 6 core-excited states of Cs Ⅲ ions is given in the present work.

Entrance Channel Dependence of the Isospin Effects of the Nuclear Stopping in Intermediate Energy Heavy-Ion Collisions

The entrance channel dependence of the isospin effects of nuclear stopping in intermediate energy heavy-ion collisions has been studied by using an isospin-dependent quantum molecular dynamics with three different kinds of symmetry potentials.It is shown that nuclear stopping is sensitive to the beam energy,the impact parameter and the mass of the colliding system,specially very sensitive to the isospin dependence of in-medium nucleon-nucleon cross section,but insensitive to symmetry potential and the ratio of neutron to proton of colliding system.From this investigation.It is proposed that nuclear stopping can be used as a new probe to extract the information on the isospin dependence of in-medium nucleon-nucleon cross section in intermediate energy heavy-ion collisions.

Theoretical Study on Properties of New Isotope 265Bh

<正> The properties of nuclei belonging to the newly observed α-decay chain starting from ~(265)Bh have beenstudied.The axially deformed relativistic mean-field calculation with the force NL-Z2 has been performed in the blockedBCS approximation.Some ground state properties such as binding energies,deformations,spins,and parities,as well asQ-values of the α-decay for this decay chain have been calculated and compared with known experimental data.Goodagreement is found.The single-particle spectrum of the nucleus ~(265)Bh is studied and some new magic numbers are found,while the magnitudes of the shell gaps in superheavy nuclei are much smaller than those of nuclei before the actiniumregion,and the Fermi surfaces are close to the continuum.Thus the superheavy nuclei are usually not stable.Theα-decay lifetimes in the ~(265)Bh decay chain are evaluated by different formulae,and compared with experimental dáta.The methods which give good agreement with the data are selected.

Benford's Law in Nuclear Structure Physics

We investigate Benford's law based on the 2003 version of atomic mass evaluation.It is demonstrated that the first non-zero digit distribution functions for a number of experimental quantities are in reasonable agreement with those predicted by Benford's law.The data that we investigate here include 3001 sets of Sp,3060 sets of Sn,2943 sets of two-neutron separation energies S_(2n),2826 sets of two-proton separation energies S_(2p),1643 sets ofβ^(+)-decay energies Q(β^(+)),1243 sets ofβ^(-)-decay energies Q(β^(-)),2595 sets of double,β^(-)-decay energies Q(ββ^(-)),and 2711 sets of energies in electron-capture proton processes Q(εp).The first non-zero digits of these data favor the smaller ones in a logarithmic pattern.

Challenge on the Astrophysical R-Process Calculation with Nuclear Mass Models

我们在宇宙的快速的中子俘获 nucleosynthesis 过程的理解取决于原子集体预言的可靠性。在相对论的吝啬的地理论(RMF ) 在最新发达的集体表格边开始了，我们在 r 过程计算以后调查集体模型的影响，假定一样的天体物理学的条件。到目前为止不能到达的原子核上的不同模型预言在计算 r 过程丰富导致重要偏差。

Probing the density dependence of the symmetry energy with central heavy ion collisions

An improved isospin dependent Boltzmann Langevin model,in which the inelastic channels and momentum dependent interactions are incorporated,is used to investigate the high-density behavior of nuclear symmetry energy.By taking several forms of nuclear symmetry energy,we calculate the time evolutions of neutron over proton ratio,π multiplicity and π-/π+ ratio,and the kinetic energy and transverse momentum spectra of π-/π+ ratio in the heavy ion collisions at 400A MeV.It is found that the neutron over proton ratio and π-/π+ ratio are very sensitive to the nuclear symmetry energy,and the π-is more sensitive to the nuclear symmetry energy than the π+.A supersoft symmetry energy results in a larger π-/π+ ratio.

Positions and Widths of Anticrossings for Potassium Rydberg Stark States

B 花键扩大技术被使用在一个静态的电场为钾 Rydberg 状态学习反十字路口。我们的计算的结果显示反十字路口主要被核心相互作用或由好结构相互作用引起。我们位置和反十字路口的宽度的结果在对试验性的数据的好同意。

Study of Microwave Multiphoton Transition of Rydberg Potassium Atom by Using B-Spline

The B-spline expansion technique and time-dependent two-level approach are applied to study the interaction between the microwave field and potassium atoms in a static electric field. We obtain theoretical multiphoton resonance spectra that can be compared with the experimental data. We also obtain the time evolution of the final state in different microwave fields.

Exploring the sensitivity of α-decay half-life to neutron skin thickness for nuclei around ^(208)Pb

Based on the newest experimentally extracted nuclear density distributions for double-magic nucleus208Pb(Tarbert et al. in Phys Rev Lett 112:242502, 2014),the sensitivity of α-decay half-life to nuclear skin thickness is explored in the vicinity of the shell closure region around208 Pb, i.e., isotopes of Z ? 82 and isotones of N ? 126.With the two-parameter Fermi(2PF) density distributions and an analytically derived formula, the α-decay half-life is found to be closely related to the magnitude of nuclear skin thickness. For a decays to the Z ? 82 isotopes, the α-decay half-life is found to decrease with the increasing neutron skin thickness, while the opposite behavior is found for a decays to the N ? 126 isotones. Therefore, it could be a possible way to extract the nuclear skin thickness from measured α-decay half-lives.

Neutron Halos in the Excited States of Spherical Nuclei Near the β-Stable Line

The newly discovered neutron halos in the excited states of nuclei 12B, 13C, and 209pb are studied by therelativistic mean-field theory. The calculated binding energies are very close to the experimental ones. The experimentally extracted root-mean-square radii of the last neutron with different occupations in nuclei are well reproduced bycalculations. New candidates for the neutron halos in excited states are predicted and are useful for further search ofneutron halos in the excited states of stable nuclei.

Production of heavy neutron-rich nuclei with radioactive beams in multinucleon transfer reactions

The production mechanism of heavy neutronrich nuclei is investigated by using the multinucleon transfer reactions of ^(136;148)Xe+^(208)Pb and ^(238)U+^(208)Pb in the framework of a dinuclear system model. The evaporation residual cross sections of target-like fragments are studied with the reaction system ^(148)Xe+^(208)Pb at near barrier energies. The results show that the final isotopic production cross sections in the neutron-deficient side are very sensitive to incident energy while it is not sensitive in the neutron-rich side. Comparing the isotopic production cross sections for the reactions of ^(208)Pb bombarded with stable and radioactive projectiles, we find that neutron-rich radioactive beams can significantly increase the production cross sections of heavy neutron-rich nuclei.

Exploration of Unbound States by Analytical Continuation in the Coupling Constant Method Within Relativistic Mean Field Theory

For the first time,the analytical continuation in the coupling constant method has been combined with the relativistic mean field theory to study the unbound states in spherical nuclei.The 1d_(3/2) neutron state in ^(16)O and the 2d_(5/2) and 1g_(9/2) neutron states in ^(48)Ca are taken as examples.The calculated energies and widths are compared with available data.