arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0705.1878nucl-th
收藏

A=14镜像核连续谱中的同位旋不对称性

Isospin asymmetry in the continuum of the A=14 mirror nuclei

H. Sagawa

摘要:

采用Hartree-Fock(HF)+无规相位近似(RPA)线性响应函数理论,考虑Skyrme相互作用,适当考虑连续效应,研究了镜像核$^{14}$ O和$^{14}$ C中等激子(IS)激发的同位旋不对称性.指出了在粒子阈值附近的连续谱中,相对于激发能和规则强度,离子的偶极响应是不对称的。另一方面,在巨共振(GR)区没有发现明显的不对称迹象。在四极情况下,计算的镜像核的强度显示出几乎相同的能量依赖性从阈值到GR区域。结果表明,在阈值附近,磁共振响应的跃迁密度表现为扩展的晕结构,而GR区的跃迁密度则表现为典型的压缩集体模的径向依赖性,没有任何晕效应。与四极响应的跃迁密度相反,四极响应的跃迁密度在阈值附近和GR能区都没有表现出波函数的扩展特征。计算的IS多极态的强度分布与最近的实验数据进行了比较获得的多极分解分析的$α$非弹性散射$^{14}$ O。

英文摘要:

We study the isospin asymmetry in the isoscalar (IS) excitations in the mirror nuclei $^{14}$O and $^{14}$C by using the Hartree-Fock(HF)+random phase approximation (RPA) linear response function theory with a Skyrme interaction to take into account the continuum effect properly. The asymmetry in the IS monopole, dipole responses is pointed out in the continuum near the particle threshold with respect to the excitation energy and the sum rule strength. On the other hand, no clear sign of the asymmetry is found in the giant resonance (GR) region. In the quadrupole case, the calculated strengths of the mirror nuclei show almost the same energy dependence from the threshold to the GR region. It is found that the transition densities of the monopole response show an extended halo structure near the threshold, while those of GR region show a typical radial dependence of the compressional collective mode without any halo effect. Contrary to the transition densities of the monopole response, those of quadrupole response do not show any sign of the extended feature of wave functions neither near the threshold nor the GR energy region. Calculated strength distributions of the IS multipole states are compared with recent experimental data obtained by the multipole decomposition analysis of $α$ inelastic scattering on $^{14}$O.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑