Study of Isospin dependence of mean field and vibration in unstable nuclei

不稳定核中平均场和振动同位旋依赖性的研究

• 批准号: 16540259
• 负责人: SAGAWA Hiroyuki
• 金额: $ 2.18万
• 依托单位: The University of Aizu
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540259/
• 关键词: unstable nuclei; mean field; isospin; halo nuclei; pairing correlation; 対相関; 平均場理論; di-neutron相関; 原子核変形; 中性子核物質

We studied the paring correlations in unstable nuclei by Hartree-Fock(HF)-BCS mode and also HF-Bogolyubov model solving in the coordinate space. We studied also the response function of Electric quadrupole excitation and spin excitation taking into account the coupling to the continuum properly. We found that the response function is very sensitive to the separation energy of valence neutrons and shows a huge enhancement just above the threshold when the last neutrons have a very small separation energy less than 1MeV.We studied correlations among several nuclear matter properties in the Skyrme HF and relativistic mean field (RMF) models. Linear correlations are found between neutron skin thickness, the pressure of the neutron matter and also the symmetry energy coefficient using various Skyrme Hamiltonian and Lagrangians of mean field models. The correlations between the isovector nuclear matter properties and the isospin dependence of isoscalar giant monopole resonance s are also poi … More nted out. Charge exchange spin-dipole excitations of 90Zr and 208Pb are studied in order to extract the neutron skin thickness and to determine the neutron matter equation of states. The isospin dependence of the nuclear incompressibility is also studied in the HF+random phase approximation (RPA).The pairing correlations in weakly bound nuclei, so called Borromean nuclei, on the edge of neutron drip line, 6He and 11Li, is studied by using a three-body model in which two valence neutrons interact with each other by a density-dependent contact force. We pointed out the di-neutron type correlation play a dominant role in these nuclei. The behavior of the neutron pair at different densities is simulated by calculating the two neutron wave function at several distances between the core nucleus and the center of mass of the two neutrons. We found that the di-neutron wave function shows an analogy to the BCS and BEC phases of the Cooper pair wave functions found in the infinite nuclear matter. The Coulomb breakup cross sections will be also discussed to probe the theoretical conjectures. Less

我们通过 Hartree-Fock(HF)-BCS 模式以及坐标空间中的 HF-Bogolyubov 模型求解研究了不稳定原子核中的配对相关性。我们还研究了考虑到耦合的电四极激发和自旋激发的响应函数。我们发现响应函数对价中子的分离能非常敏感，并且当最后一个中子的分离能小于1MeV。我们研究了 Skyrme HF 和相对论平均场 (RMF) 模型中几种核物质特性之间的相关性，使用各种 Skyrme 哈密顿量和拉格朗日量发现了中子皮厚度、中子物质压力以及对称能量系数之间的线性相关性。平均场模型的等向量核物质性质与等标量巨单极子共振的同位旋依赖性之间的相关性也被指出。研究了 90Zr 和 208Pb 的电荷交换自旋偶极子激发，以提取中子表层厚度并确定中子物质状态方程，并在 HF+随机相近似中研究了核不可压缩性的同位旋依赖性。 RPA）。位于中子滴线边缘的弱束缚核（所谓的 Borromean 核）、 6He 和11Li，通过使用三体模型进行研究，其中两个价中子通过密度相关的接触力相互作用，我们指出双中子类型相关性在这些中子的行为中起主导作用。通过计算核心核和两个中子质心之间多个距离处的两个中子波函数来模拟不同密度的双中子波函数，我们发现双中子波函数与 BCS 类似。还将讨论无限核物质中发现的库珀对波函数的 BEC 相，以探讨理论猜想。

项目成果

Weakly-bound neutrons and quadrupole response function in the many-body pair-correlation of neutron drip line nuclei

中子滴线核多体对关联中的弱束缚中子和四极响应函数

• 发表时间: 2006
• 期刊: Jour. of Phys. G : Nucl. Part. Phys. 32
• 作者: S.Sasaki;H.Shimizu;Fangfei Li;W.Bentz;W.Bentz;W.Bentz;I.C.Cloet;S.Lawley;I.Cloet;S.Lawley;S.Lawley;I.C.Cloet;I.C.Cloet;I.C.Cloet;T.Horikawa;H.Mineo;I.C.Cloet;I.Cloet;I.Cloet;I.C.Cloet;I.C.Cloet;S.Lawley;H.Mineo;W.Bentz;H.Mineo;H.Sagawa;K.Hagino;Gianluca Colo;Gianluca Colo;K.Hagino;H.Sagawa;S.Yoshida;WenHui Long;I.Hamamoto
• 通讯作者: I.Hamamoto

Neutron Skin Thickness of 90Zr Determined By Charge Exchange Reactions

• DOI: 10.1103/physrevc.74.051303
• 发表时间: 2006-09
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: K. Yako;H. Sagawa;H. Sakai

Three-body model calculations for 16C nucleus

16C核的三体模型计算

• 发表时间: 2007
• 期刊: Phys. Rev. C 75
• 作者: S.Sasaki;H.Shimizu;Fangfei Li;W.Bentz;W.Bentz;W.Bentz;I.C.Cloet;S.Lawley;I.Cloet;S.Lawley;S.Lawley;I.C.Cloet;I.C.Cloet;I.C.Cloet;T.Horikawa;H.Mineo;I.C.Cloet;I.Cloet;I.Cloet;I.C.Cloet;I.C.Cloet;S.Lawley;H.Mineo;W.Bentz;H.Mineo;H.Sagawa;K.Hagino
• 通讯作者: K.Hagino

Identification of high spin states in 100Zr

• DOI: 10.1103/physrevc.74.017303
• 发表时间: 2006-07
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: J. K. Hwang;A. Ramayya;J. Hamilton;J. Rasmussen;Y. Luo;D. Fong;K. Li;C. Goodin;S. Zhu;S. C. Wu;M. Stoyer;R. Donangelo;X. R. Zhu;H. Sagawa

Evolution of deformations in medium-mass nuclei

• DOI: 10.1103/physrevc.72.054311
• 发表时间: 2005-10
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: H. Sagawa;X. Zhou;X. Zhang