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

我们研究了Hartree-fock（HF）-BCS模式以及在坐标空间中解决HF-Bogolyubov模型的不稳定核中的削皮相关性。我们还研究了电动四极兴奋和自旋兴奋的响应函数，并考虑到了持续的耦合。我们发现，响应函数对价中子的分离能非常敏感，并且在最后一个中子的分离能小于1MMEV时显示出巨大的增强，高于阈值。我们研究了Skyrme HF中的几个核物质性质之间的相关性和相对论均值（RMF）模型（RMF）。在中性皮肤厚度，中性物质的压力以及使用各种Skyrme Hamiltonian和平均场模型的Lagrangian的对称能量之间发现线性相关性。等核物质性质与等异，等异，巨型单极共振的依赖性也更加陷入困境。为了提取中子皮肤的厚度并确定状态的中子物质等效性，刺激了90ZR和208pb的电荷交换自旋 - 偶极性。核不可压缩性的isosspin依赖性在HF+随机相位近似（RPA）中也研究了。弱结合的核的配对相关性在中性滴水线，6he和11li的边缘，通过使用三体模型与对方相互作用的三体模型进行研究，从而在中性滴水线，6he和11li中进行了研究。我们指出，Di-Neutron类型相关性在这些核中起主要作用。通过在核心核和两个中子的质量中心之间的几个距离计算两个中子波函数来模拟中子对在不同密度下的行为。我们发现，Di-Neutron波函数与无限核物质中发现的库珀对波函数的BC和BEC相似。还将讨论库仑分手横截面以探测理论猜想。较少的

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