Fine Structure and Collectivity of the Levels of the Pygmy Dipole Resonance in 208Pb in a Self-Consistent Model

被引:8
作者
Lyutorovich, N. A. [1 ]
Tselyaev, V., I [1 ]
Achakovskiy, O., I [2 ]
Kamerdzhiev, S. P. [3 ]
机构
[1] St Petersburg State Univ, St Petersburg 199034, Russia
[2] Natl Res Ctr, Leipunsky Inst Phys & Power Engn, Obninsk 249033, Kaluga Region, Russia
[3] Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia
基金
俄罗斯科学基金会;
关键词
MAGIC NUCLEI; ISOSCALAR; CONFIGURATIONS; STRENGTH;
D O I
10.1134/S0021364018110103
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A novel fully self-consistent microscopic approach based on the energy density functional method is employed to calculate the fine structure of the pygmy dipole resonance in Pb-208, i.e., the energies and reduced probabilities of E1 transitions for the states with energies below 10 MeV. The approach includes the random-phase approximation, quasiparticle-phonon interaction and the single-particle continuum. The theoretical results are compared to the available high-resolution data and found to agree with measured integral characteristics of the pygmy dipole resonance at energies above 5.7 MeV. Residual spin-spin forces are quantified, and their contribution is found to be significant at both low and high energies. A recently proposed criterion is employed to analyze the collectivity of the 1(-) states in Pb-208.
引用
收藏
页码:659 / 664
页数:6
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