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

被引：7

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

来源：

JETP LETTERS | 2018年 / 107卷 / 11期

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

页码：659 / 664

页数：6

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