Semimicroscopic Description of Isoscalar Giant Multipole Resonances in the $${}^{\mathbf{208}}$$ Pb Nucleus

Physics of Atomic Nuclei - An approach to describing main properties of isoscalar giant multipole resonances in medium-heavy closed-shell nuclei is proposed within the particle–hole...     

声波激励下水中孤立气泡的多阶谐振

本文基于水中孤立气泡多阶谐振理论,在考虑了气泡内气体的导热损失、水的粘滞性和水的表面张力影响的同时,对气泡各阶谐振引起的声散射和声吸收机理作了分析。结果表明:气泡的声散射和声吸收随谐振阶数的增高而迅速减少;气泡处于谐振时,气体的导热损失在气泡对声波的耗散作用中起决定作用;与不考虑各种影响时相比,气泡的谐振频率发生频移。     

The Temperature Dependence of Giant Resonances in High-Excited Nucleus

We use the Hartree-Fock equation and the linear response theory in finite temperature to calculate the positions and transition strenghths of the giant resonances of high-excited nucleus Pb₂₈.The result shows a downward shift and a broadening of the giant resonance energies as temperature increases.     

Giant resonances on excited states

We derive modified RPA equations for small vibrations about excited states. The temperature dependence of collective excitations is examined. The formalism is applied to the ground state and the first excited state of ⁹⁰Zr in order to confirm a hypothesis which states that not only the ground state but every excited state of a nucleus has a giant resonance built upon it.     

Study of Pt isotopes in the core excited interacting boson model 1

The core exited IBM model was applied to the Pt isotopes. It was found that the energy spectra of the high-spin states as well as those of the low-spin states can be reproduced quite well. Also, it was found that there is a structure transition between ¹⁸⁶Pt and ¹⁸⁸Pt. The B(E2) values of ¹⁸⁴Pt were calculated and compared with recent experimental data. It was found that the general features of the B(E2) values can be reproduced qualitatively. The need of more boson core excitations is also discussed.     

Effect of the Splitting of Deep Nuclear Shells on the Structure of Multipole Resonances

Physics of Atomic Nuclei - The effect of the splitting of nuclear shells lying substantially lower than the Fermi energy on the fragmentation of multipole resonances in cross sections for the...     

Probing Nuclear Symmetry Energy with Giant Dipole Resonances in Finite Nuclei

The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied.It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density.This linear correlation leads to the symmetry energy at the saturation density at the interval 33.0 MeV ≤ S(ρ_0) ≤ 37.0 MeV,and the symmetry energy at ρ=0.1 fm~(-3) at the interval 21.2-22.5 MeV.It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear matter.     

Multipole corrections to the electronic terms of a highly excited molecule

The properties are investigated of the electronic terms of a molecule with one of its electrons highly excited. These terms have a form similar to the ground electronic term of the corresponding molecular ion (core), and are obtained in the zeroth approximation by a parallel downward shift equal to Ry/n₂ and independent of the internuclear distances (symbasis property). The main causes of the deviation from this property are discussed. The nonsymbatic corrections, necessitated by the multipole interaction of the Rydberg electron with the ion core, are discussed. The possibility of using the results to detect new exciplexes is indicated.Translated from Trudy Fizicheskogo Instituta im. P. N. Lebedeva, Vol. 120, pp. 107–119, 1980.     

A Chiral Breaking Field Theory for Giant Multipole States of Nuclei

The isoscalar giant monopole and quadrupole states of finite nuclei are studied in a relativistic chiral breaking field theory by making use of local Lorentz-boost and scaling method. The nudear surface effect and the density distribution are treated in the relativistic Thomas-Fermi approximation. The excitation energies of the giant resonances are self consistently calculated. The numerical results for the excitation energies are in agreement with experimental data for all nuclei.     

Relativistic RPA and Giant Resonances in β Stable and Unstable Nuclei

The nuclear isoscalar and isovector giant resonances in stable and unstable nuclei are studied in the framework of the relativistic random phase approximation. The classical meson propagators with nonlinear self-interactions are constructed in momentum space from the second variation of the action. The relativistic models with the parameter sets, TMI and NLSH, which provide good account of static ground state properties, can also well describe the collective states of nuclei, such as giant resonances. The isovector giant dipole resonances in the unstable Ar isotope chain are investigated.     

Splitting of the isovector Giant Quadrupole Resonances in12C and16O

The isovector Giant Quadrupole Resonances (GQR) of¹²C and¹⁶O have been investigated in a (1p1h) and (2p2h) modelspace using bound state wavefunctions. The results indicate a strong splitting of the (1p1h) E2 strength in both nuclei due to the coupling to the (2p2h) configurations. Such an effect has not been found in the case of the Giant Dipole resonance. This qualitatively different behaviour can be understood from the unperturbed particle hole energies of the 1 and E2 Giant Resonances, respectively.     

Pygmy and Giant Dipole Resonances in Proton-Rich Nuclei ~(17,18)Ne

The pygmy and giant dipole resonances in proton-rich nuclei~(17,18)Ne are investigated with a fully self-consistent approach. The properties of ground states are calculated in the Skyrme Hartree-Fock with the Bardeen-CooperSchrieffer approximation to take into account the pairing correlation. The quasiparticle random phase approximation(QRPA) method is used to explore the properties of excited dipole states. In the calculations the SLy5 Skyrme interaction is employed. In addition to the giant dipole resonances, pygmy dipole resonances(PDR) are found to be located in the energy region below 10 MeV in both 17,18 Ne. The strength and transition density show that the low-lying states are typical PDR states. However, analyzing the QRPA amplitudes of proton and neutron 2 quasiparticle(2 qp) configurations for a given low-lying state in ~(17,18)Ne, we find that the PDR state is less collective, more like a single 2 qp excitation.     

Effect of Giant Resonances on Fluctuations of Electromagnetic Fields in Heavy Ion Collisions

JETP Letters - We perform quantum calculations of fluctuations of the electromagnetic fields in AA collisions at RHIC and LHC energies. Calculations are performed with the help of the...     

氢原子第二激发态的多极动态极化率和两体色散系数

基于径向库仑格林函数的积分性质,严格导出了处于第二激发态的氢原子的2l极动态极化率的解析表达式,绘出了处于第二激发态的氢原子的电偶极、电四极和电八极动态极化率随光场频率变化的曲线图.在此基础上,用两种不同的方法计算了H(3s)-H(3s)体系的两体色散系数,两种方法的计算结果相当一致.     

氢原子第二激发态的多极动态极化率和两体色散系数

基于径向库仑格林函数的积分性质,严格导出了处于第二激发态的氢原子的2l极动态极化率的解析表达式,绘出了处于第二激发态的氢原子的电偶极、电四极和电八极动态极化率随光场频率变化的曲线图.在此基础上,用两种不同的方法计算了H(3s)- H(3s)体系的两体色散系数,两种方法的计算结果相当一致.     

Microwave Giant Magnetoresistance and Ferromagnetic and Spin-Wave Resonances in (CoFe)/Cu Nanostructures

Journal of Experimental and Theoretical Physics - The microwave phenomena that occur in magnetic multilayer (CoFe)/Cu nanostructures, which have a giant magnetoresistance, are studied. The...