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Nuclear electro-magnetic dipole modes: Skyrme-RPA predictions on flow patternand estimate of experimental accessibility

核电磁偶极子模式：Skyrme-RPA 对流动模式的预测和实验可达性的估计

基本信息

批准号：
246273472
负责人：
Professor Dr. Paul-Gerhard Reinhard
金额：
--
依托单位：
Institut für Kernphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/246273472?language=en
关键词：
Nuclear electro magnetic dipole modes

项目摘要

Self-consistent mean-field models with Skyrme forces are reliable tools for describing nuclear structure and dynamics. In the present project, we apply the fully self-consistent Skyrme random - phase - approximation (RPA) models to excitation channels of a particular interest in spherical and deformed nuclei. First, we will continue to analyze the low-energy E1 strength (LES), often denoted as a pygmy dipole resonance. It delivers important information on the nuclear equation of state, particularly in the isovector channel, and the photon cross sections in the low-energy regime are crucial for astrophysical applications. We will concentrate on yet poorly understood but essential LES aspects: i) the impact of nuclear deformation, ii) the correlation with other nuclear observables (e.g. equation of state), and iii) the intrinsic structure of the low energy dipole modes (toroidal versus compressional mode). Special attention will be paid to develop proposals for experimental exploration of LES in inelastic electron scattering and other reactions, using the facilities of Technical University of Darmstadt. Second, we will address E0 modes in spherical and deformed nuclei. The aim is to resolve a yet pending puzzle in the simultaneous description of E0 modes in closed-shell and open-shell nuclei. Third, we will continue our study of magnetic modes. In particular, the spin-flip modes will be considered in both spherical and deformed nuclei. These modes may provide valuable information about the spin-dependent part of the Skyrme functional, (e.g., spin-orbit and tensor terms). In all parts of the project, a large variety of nuclei, stable and exotic (including drip-line and super-heavy), will be covered.

具有Skyrme力的自洽平均场模型是描述核结构和动力学的可靠工具。在本项目中，我们将完全自洽的Skyrme随机相位近似（RPA）模型应用于球形和变形核中特别感兴趣的激发通道。首先，我们将继续分析低能E1强度（LES），通常表示为侏儒偶极子共振。它提供了关于核状态方程的重要信息，特别是在等矢量通道中，并且在低能状态下的光子横截面对天体物理应用至关重要。我们将集中在尚不清楚但重要的LES方面：i)核变形的影响，ii)与其他核观测的相关性（例如状态方程），以及iii)低能偶极子模式（环面与压缩模式）的内在结构。将特别注意利用达姆施塔特工业大学的设备，对LES在非弹性电子散射和其他反应中的实验探索提出建议。其次，我们将讨论球形核和变形核中的E0模式。目的是解决一个悬而未决的难题，在同时描述的E0模式在闭壳和开壳核。第三，我们将继续对磁模的研究。特别是，自旋翻转模式将考虑在球形和变形核。这些模式可以提供关于Skyrme泛函中自旋相关部分的有价值的信息（例如，自旋轨道和张量项）。在项目的所有部分，将涵盖各种各样的核，稳定的和外来的（包括滴线和超重）。