论文标题
在三体模型中探索$^{29} $ f地面的两中性光环构造
Exploring two-neutron halo formation in the ground-state of $^{29}$F within a three-body model
论文作者
论文摘要
背景$ \ colon $ $^{29} $ f系统位于“反转岛”的下n边界，是一个异国情调的，弱绑定的系统。对这个系统的两种独立分离能量（$ s_ {2n} $）的了解鲜为人知。对于其未结合的二进制子系统$^{28} $ f的低洼频谱也发现了类似的情况。 目的$ \ cOLON $用于研究配置混合，物质半径和中子 - 中子之间的相关性，其基础状态在$^{29} $ f的基础状态下，在三体模型中，探索了$^{29} $ f的可能性，使其成为两种自动的halo nocleus。 方法$ \ colon $ $^{29} $ f地面波函数是通过使用分析转换的谐波振荡器的基础来建立在超球形形式上的。本计算中采用了与中央，旋转轨道和张量项的Gogny-Pires-Tourreil（GPT）NN与中央，旋转轨道和张量项的相互作用，以及由$^{28} $ f的可用实验信息约束的不同核心$+n $势。 结果$ \ colon $ $^{29} $ f地面配置混合及其物质半径是针对$^{28} $ f结构和$ s_ {2n} $ value的不同选择计算的。发现具有PF组件的D波的混合物被发现起着重要作用，有利于在波函数中酿酒型构型的优势。我们计算的Radii对$^{27} $ f $+n $电位和$ s_ {2n} $ values的敏感性有些敏感。相对于$^{27} $ f核心相对于$^{27} $ f核心的相对增加在于0.1-0.4 fm的范围内，取决于这些选择。 结论$ \ colon $我们的三体结果$^{29} $ f表示在其基态下存在适度的光环结构，该结构通过较大的入侵者组件增强。这一发现需要实验确认。
Background$\colon$ The $^{29}$F system is located at the lower-N boundary of the "island of inversion" and is an exotic, weakly bound system. Little is known about this system beyond its two-neutron separation energy ($S_{2n}$) with large uncertainties. A similar situation is found for the low-lying spectrum of its unbound binary subsystem $^{28}$F. Purpose$\colon$ To investigate the configuration mixing, matter radius and neutron-neutron correlations in the ground state of $^{29}$F within a three-body model, exploring the possibility of $^{29}$F to be a two-neutron halo nucleus. Method$\colon$ The $^{29}$F ground-state wave function is built within the hyperspherical formalism by using an analytical transformed harmonic oscillator basis. The Gogny-Pires-Tourreil (GPT) nn interaction with central, spin-orbit and tensor terms is employed in the present calculations, together with different core$+n$ potentials constrained by the available experimental information on $^{28}$F. Results$\colon$ The $^{29}$F ground-state configuration mixing and its matter radius are computed for different choices of the $^{28}$F structure and $S_{2n}$ value. The admixture of d-waves with pf components are found to play an important role, favoring the dominance of dineutron configurations in the wave function. Our computed radii show a mild sensitivity to the $^{27}$F$+n$ potential and $S_{2n}$ values. The relative increase of the matter radius with respect to the $^{27}$F core lies in the range 0.1-0.4 fm depending upon these choices. Conclusions$\colon$ Our three-body results for $^{29}$F indicate the presence of a moderate halo structure in its ground state, which is enhanced by larger intruder components. This finding calls for an experimental confirmation.
