Compatibility of Exotic States with Neutron Star Observation
Chang Ho Hyun
考虑了近距离重子-重子相互作用中的硬核排斥效应对中子星性质的影响。我们得到，即使中子星内部有超子，中子星的质量也可以达到$\sim 2 M_\odot$。
We consider the effect of hard core repulsion in the baryon-baryon interaction at short distance to the properties of a neutron star. We obtain that, even with hyperons in the interior of a neutron star, the neutron star mass can be as large as $\sim 2 M_\odot$.
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It is shown the possibility of existence of metastable atoms of dineutroneum as a bound state of two neutrons and one neutrino. Such atoms can appear in a reaction of deuterons with free or quasi-free electrons. The estimation of mass, size and lifetime of dineutroneum atom is fulfilled.
The recent high precision observation of the most massive pulsar J1614-2230 with $(1.97\pm0.04)$ solar mass ($M_\odot$) was reported with a suggestion that many nuclear models which consider exotic particles in the core could be ruled out. However, many recent calculations could explain this star with various exotic particles, rendering the precise mass measurements insufficient to conclude on exotic cores. We examine the sensitivity of the radius of such a star to the details of its core. With our calculations and analysis, here we show that, for the most massive neutron star, with a precise …
Charge density distributions and related form factors in neutron-rich light exotic nuclei
计算并比较了$^{6,8}$ He、$^{11}$ Li、$^{17,19}$ B和$^{14}$ Be等奇异核中质子密度分布对应的电荷形状因子。这些结果可以作为检验各种理论模型的奇异核结构在未来可能的实验中使用碰撞电子奇异核存储环。这种比较的结果将显示出中子晕或中子皮对奇异核中质子分布的影响。
Exotic and drip-line nuclei as well as nuclei immersed in a low density gas of neutrons in the outer crust of neutron stars are systematically investigated with respect to their neutron pairing properties. This is done using Skyrme density-functional and different pairing forces such as a density-dependent contact interaction and a separable form of a finite-range Gogny interaction. Hartree-Fock-Bogoliubov and BCS theories are compared. It is found that neutron pairing is reduced towards the drip line while overcast by strong shell effects. Furthermore resonances in the continuum can have an i…
Using HF+BCS method we study light nuclei with nuclear charge in the range $2 \leq Z \leq 8$ and lying near the neutron drip line. The HF method uses effective Skyrme forces and allows for axial deformations. We find that the neutron drip line forms stability peninsulas at $^{18}$He and $^{40}$C. These isotopes are found to be stable against one neutron emission and possess the highest known neutron to proton ratio in stable nuclei.
Nuclear Superfluidity in Exotic Nuclei and Neutron Stars
在滴线附近的奇异核和中子星的内壳物质中，核过剩具有共同的特征，可以用相同的理论工具来处理。在我的演讲的第一部分，我将讨论如何两个这样的工具，即HFB的方法和线性响应理论可以用来描述在弱束缚核，其中的能谱的未绑定部分的配对相关变得重要。然后，利用同样的模型，我将讨论核超流性如何影响中子星内壳的热性质。
Molecular Structure with Exotic Clusters in light Neutron-rich Nuclei
用反对称分子动力学方法研究了Be-12、Be-14和B-15的激发态。在预测的激发态中，我们发现了新颖的分子状结构，具有非常奇异的团簇，如Be-14中的6 He +8 He和B-15中的6 He +9 Li。通过4个中子和2个质子之间的新型关联，理解了丰中子核中He-6团簇发展的起源。在本文中，我们也提出了我们最近的挑战，研究$sd$壳核。讨论了Ar-36和Ca-40的形状共存问题。
Exotic Properties of Light Nuclei and their Neutron Capture Cross Sections
我们研究了在一些丰中子轻核基态中观察到的中子晕组态对中子辐射跃迁过程的影响。特别地，我们研究了中子晕对直接辐射俘获（DRC）过程的影响。由于入射p波中子的能量依赖性以及E1发射的强度强烈地受剩余核捕获态的晕配置的影响。计算了~（10）Be（n，γ）~（11）Be的DRC截面，并与实验结果进行了比较。我们表明，从比较，一些重要的信息晕核11 Be的结构可以得到。
Exotic fission properties of highly neutron-rich Uranium isotopes
在幻数N=162/164附近具有$N=154 \sim 172$的铀同位素系列被鉴定为热裂变的。这里考虑的热中子裂变的一个典型的代表性$^{249}$ U的这个区域适合在放射性离子束设施的合成。裂变势垒高度和宽度的半经验研究表明，这种核是无限稳定的自发裂变，由于势垒宽度的增加所产生的过剩中子。碎片质量产额的概率计算和相对论平均场论的微观研究表明，该核经历了一种新的热裂变衰变模式，称为{ \it多重碎裂裂变}，其中许多瞬发裂变中子与两个重裂变碎片一起同时释放。
The multinucleon transfer reaction in the collisions of $^{40}$Ca+$^{124}$Sn at $E_{\textrm{c.m.}}=128.5$ MeV is investigated by using the improved quantum molecular dynamics model. The measured angular distributions and isotopic distributions of the products are reproduced reasonably well by the calculations. The multinucleon transfer reactions of $^{40}$Ca+$^{112}$Sn, $^{58}$Ni+$^{112}$Sn, $^{106}$Cd+$^{112}$Sn, and $^{48}$Ca+$^{112}$Sn are also studied. It shows that the combinations of neutron-deficient projectile and target are advantageous to produce the exotic neutron-deficient nuclei n…
We study the correlations between two neutrons in borromian nuclei $^{11}$Li and $^6$He by using a three-body model with a density-dependent contact two-body interaction. It is shown that the two neutrons show a compact bound feature at the nuclear surface due to the mixing of single particle states of different parity. We study the Coulomb breakup cross sections of $^{11}$Li and $^6$He using the same three-body model. We show that the concentration of the B(E1) strength near the threshold can be well reproduced with this model as a typical nature of the halo nuclei. The energy distributions o…
We study the correlation between the thickness of the neutron skin in finite nuclei and the nuclear symmetry energy for isotopic chains of even-even Ni, Sn, and Pb nuclei in the framework of the deformed self-consistent mean-field Skyrme HF+BCS method. The symmetry energy, the neutron pressure and the asymmetric compressibility in finite nuclei are calculated within the coherent density fluctuation model using the symmetry energy as a function of density within the Brueckner energy-density functional. The mass dependence of the nuclear symmetry energy and the neutron skin thickness are also st…
An Undergraduate Approach to the Quantum Hadrodynamics and the Physics of Neutron Stars Part II: Neutron Stars' Exotic Content
该研究为本科生提供量子强子动力学的学习方法，运用第一部分的形式体系探讨中子星核心非原子自由度的作用，聚焦中子星奇异成分。
Pygmy dipole resonance in exotic nuclei
在Sn同位素和N=82的等渗链中研究了PDR强度随中子过剩的演化，并讨论了PDR强度与中子皮厚度的可能关系。为此，最近提出的方法，将HFB和多声子QPM理论的应用。分析了相应的中子和质子偶极跃迁密度。
Proton-neutron multiplets in exotic 134Sb: testing the shell-model effective interaction
本文将134 Sb的实验能级结构与壳模型计算结果进行了比较，壳模型计算中有效相互作用的两体矩阵元是由CD-Bonn核子-核子势导出的。实验数据，包括非常低的第一激发1-状态，是非常好地再现的理论。本文的结果补充了我们以前对135 Sb和134 Sn的研究，表明我们的有效相互作用非常适合描述N=82以上的132 Sn邻居。对质子-中子有效相互作用矩阵元的各项进行了研究，证明了它们的相对重要性。
In this theoretical study, we establish a correlation between the neutron skin thickness and the nuclear symmetry energy for the even$-$even isotopes of Fe, Ni, Zn, Ge, Se and Kr within the framework of the axially deformed self-consistent relativistic mean field for the non-linear NL3$^*$ and density-dependent DD-ME1 interactions. The coherent density functional method is used to formulate the symmetry energy, the neutron pressure and the curvature of finite nuclei as a function of the nuclear radius. We have performed broad studies for the mass dependence on the symmetry energy in terms of t…
We present the first application of the newly developed EKK theory of the effective nucleon-nucleon interaction to shell-model studies of exotic nuclei, including those where conventional approaches with fitted interactions encounter difficulties. This EKK theory enables us to derive the interaction suitable for several major shells ($sd$+$pf$ in this work). By using such an effective interaction obtained from the Entem-Machleidt QCD-based $χ\mathrm{N}^3\mathrm{LO}$ interaction and the Fujita-Miyazawa three-body force, the energies, E2 properties and spectroscopic factors of low-lying states o…
Unified approach to nuclear densities from exotic atoms
用最小二乘法拟合奇异原子中的强相互作用观测量，得到核密度分布参数。反质子和π原子的全球分析表明，这两种类型的探针之间的平均行为的中子分布的均方根半径相当不错的协议。关于中子分布形状的明显冲突归因于这两个探头的不同径向灵敏度。
Neutron versus proton scattering on exotic nuclei: the $^9$He example
针对奇异核中子散射无法直接研究的问题，本文基于同位旋对称性提出同位旋守恒耦合道模型（ICM），通过分析$^{8}$He+$p$共振散射数据，预测不同同位旋态的相移差异并提出数据替代解释，强调中子发射道研究的重要性。
Relativistic description of exotic collective excitation phenomena in atomic nuclei
在相对论Hartree-Bogoliubov模型（RHB）的正则基下，采用完全自洽的相对论准粒子无规相位近似（RQRPA），研究了丰中子核的低激发态偶极和四极.在较重的原子核中，低位的E1激发态被认为是一种侏儒偶极共振（PDR），即过剩中子对质子-中子核振荡的集体模式。PDR的同位素依赖性的特征在于PDR和单中子分离能之间的交叉。已经在中度质子-中子不对称的PDR峰值计算以上的中子发射阈值，表明重要的影响，观察PDR（γ，γ '）散射，并在理论上预测的富中子核中的辐射中子俘获率。此外，本文还提出了一种新的方法来确定核的中子皮，该方法是基于对伽莫夫-特勒共振相对于同量异位素模拟态的激发能的测量。
We study the feasibility of detecting exotic cores in merging neutron stars with ground-based gravitational-wave detectors. We focus on models with a sharp nuclear/exotic matter interface, and assume a uniform distribution of neutron stars in the mass range $[1,2] M_\odot$. We find that the existence of exotic cores can be confirmed at the 70% confidence level with as few as several tens of detections. Likewise, with such a sample, we find that some models of exotic cores can be excluded {with high confidence}.
Neutron-neutron correlation in the halo dissociation of light exotic nuclei
我们提出的模型结果的两个晕中子的关联函数，$C_{nn}$，轻奇异核的解离过程模拟为两个中子和一个核心。最小值预测为$C_{nn}$作为两个中子的相对动量的函数，$p_{nn}$，由于中子在晕和终态相互作用的相干性。研究系统$^{14}$ Be，$^{11}$ Li和$^{6}$ He在这个模型中，我们表明，数值渐近极限，$C_{nn}\to 1$，只发生为$p_{nn}\gtrsim$ 400 MeV $/c$，而这样的限制达到低得多的值$p_{nn}$在一个独立的粒子模型中使用的最近的实验数据的分析。一旦实验关联函数被适当地归一化，我们的模型与数据是一致的。
The isotopic dependence of the complete fusion (capture) cross section is analyzed in the reactions $^{130,132,134,136,138,140,142,144,146,148,150}$Xe+$^{48}$Ca with stable and radioactive beams. It is shown for the first time that the very neutron-rich nuclei $^{186-191}$W can be reached with relatively large cross sections by complete fusion reactions with radioactive ion beams at incident energies near the Coulomb barrier. A comparison between the complete fusion and fragmentation reactions for the production of neutron-rich W and neutron-deficient Rn isotopes is performed.
Exploring total fission cross sections of neutron- and proton-induced reactions of exotic nuclei at relativistic energies using the INCL-ABLA++ models
本研究利用中子和质子诱导裂变数据集，对改进的INCL-ABLA++模型进行基准测试，验证了其预测总裂变截面的可靠性，并进一步应用于研究远离稳定谷的奇特重核裂变截面。
[Background] Reactions with stable beams have demonstrated a strong interplay between nuclear structure and fusion. Exotic beam facilities open new perspectives to understand the impact of neutron skin, large isospin, and weak binding energies on fusion. Microscopic theories of fusion are required to guide future experiments. [Purpose] To investigate new effects of exotic structures and dynamics in near-barrier fusion with exotic nuclei. [Method] Microscopic approaches based on the Hartree-Fock (HF) mean-field theory are used for studying fusion barriers in $^{40-54}$Ca+$^{116}$Sn reactions fo…
The halo of the exotic nucleus 11Li: a single Cooper pair
如果中子被逐渐加到一个正常的原子核中，泡利原理迫使它们进入更高动量的状态。当核心变得中子饱和时，核心将最后一个中子的大部分波函数排出，形成晕，由于其大尺寸，因此具有较低的动量。大自然如何稳定如此脆弱的系统，并提供将晕中子束缚在核心所需的胶水，这是一个悬而未决的问题。在这里，我们表明，这个问题是类似的不稳定性的正常状态的电子系统在零温度下解决的库珀，解决方案是在BCS理论的基础上的超导性。通过模拟这种方法，除了裸核子-核子相互作用，长波长振动的原子核$^{11}$锂，晕核的范例，作为定制的胶水的最小约束中子，我们能够获得一个统一的和定量的图片所观察到的性质的$^{11}$锂。
The exotic phenomenon of two-neutron halos and 2n-radioactivity are explored in the neutron-rich $^{40,42,44}$Mg by employing various variants of the relativistic mean-field approach. The extended tail of spatial density distributions including the enhanced neutron radii and skin thickness, pairing correlations, single-particle spectrum and wave functions predict $^{40,42,44}$Mg to be strong candidates for deformed neutron halos. Weakening of magicity at N$=$28 plays a significant role in the existence of a weakly bound halo in $^{40}$Mg which is currently the heaviest isotope of Mg accessible…
We present a review of recent works on clustering phenomena in unstable nuclei studied by antisymmetrized molecular dynamics (AMD). The AMD studies in these decades have uncovered novel types of clustering phenomena brought about by the excess neutrons. Among them, this review focuses on the molecule-like structure of unstable nuclei. One of the earliest discussions on the clustering in unstable nuclei was made for neutron-rich Be and B isotopes. AMD calculations predicted that the ground state clustering is enhanced or reduced depending on the number of excess neutrons. Today, the experiments…
Journal of Combinatorial Theory, Series B, 98(1):173-225, 2008n exotic nuclei are studied in the framework of a fully self-consistent relativistic continuum random phase approximation (RCRPA). In this method the contribution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green's function. Different from the cases in stable nuclei, there are strong low-energy excitations in neutron-rich nuclei and proton-rich nuclei. The neutron or proton excess pushes the centroid of the strength function to lower energies and increases the fragmentation of the stren…
Can average speed of sound and thermodynamic response functions signal the exotic phases in neutron star cores?
探讨通过声速平均值、对数导数及其他热力学变量理解中子星结构，借助等温压缩率等热力学响应函数区分中性条件以揭示相变特征，相应质量-半径关系显示状态方程满足天体物理约束，最大质量构型含特定相。
Shell-model Structure of Exotic 135Sb
最近的研究提供了关于非常富中子的核135 Sb的新的实验信息。我们已经进行了壳模型计算，这个核使用一个现实的有效相互作用来自CD波恩核子核子势。这给出了一个很好的描述所观察到的性质的135锑。结果表明，第一激发态J=5/2+的极低位置和M1到基态的强阻碍跃迁起源于有效的中子-质子相互作用.
Exotic nuclear phases in the inner crust of neutron stars in the light of Skyrme-Hartree-Fock theory
采用Skyrme-Hartree-Fock方法研究了中子星壳的底部，其中库仑相互作用的处理超出了Wigner-Seitz近似.在这个区域中发现多种核相共存。它们的稳定性和相对能量由库仑能、表面能和壳能决定。我们还发现，一个实质性的贡献是来自自旋轨道相互作用。
Shell Structure of Exotic Nuclei
理论预测和实验发现的中子丰富，寿命短的原子核远离稳定表明，熟悉的概念核子壳结构应被认为是不太强大的比以前认为的。本文综述了奇异核中单粒子运动的概念，着重讨论了三个方面：（i）由于张量相互作用，核平均场随中子过剩的变化;（ii）多体关联的重要性;（iii）开放通道对弱束缚态和非束缚态性质的影响。
Exotic clusters in the excited states of Be-12, Be-14 and B-15
用反对称分子动力学方法研究了Be-12、Be-14和B-15的激发态。理论结果再现了Be-12的激发态的能级，并预测了Be-12、Be-14和B-15中具有新颖团簇结构的转动带.理论上提出了新的奇异团簇（He-6，He-8和Li-9）的成簇态。丰中子核的一个新的方面是4个中子和2个质子之间的6核子关联，这在成团过程中He-6团簇的形成中起着重要作用：Be-14的8He +6 He和B-15的9 Li +6 He。
The general behavior of the nuclear equation of state (EOS), relevant for the description of neutron stars (NS), is studied within a Bayesian approach applied to a set of models based on a density dependent relativistic mean field description of nuclear matter. The EOS is subjected to a minimal number of constraints based on nuclear saturation properties and the low density pure neutron matter EOS obtained from a precise next-to-next-to-next-to-leading order (N$^{3}$LO) calculation in chiral effective field theory ($χ$EFT). The posterior distributions of the model parameters obtained under the…
Unbound exotic nuclei studied by projectile fragmentation
当所研究的观测量是中子-核相对能谱时，我们称中子晕核的“抛射碎裂”为弹性碎裂（衍射）反应。这个可观察到的已被测量的库仑分裂重目标，最近也轻目标。这些数据启发了中子末态与起源核相互作用的影响。本文用一个含时模型研究了核子在中子-堆芯复势中从束缚态到连续共振态的激发过程，其中中子-堆芯复势起末态相互作用。用光学模型S-矩阵描述终态，从而可以研究任何连续谱能量的共振态和非共振态以及深束缚的初态。结果表明，由于初态和终态之间的耦合，在出口通道中，中子芯自由粒子的相移被附加相位修改。一些典型的数值计算相关的可观测量，并与实验数据进行比较。我们认为，未束缚核的激发能谱可能反映了它们是由其碎裂而得到的母核的结构。
The BCS and HFB theories which can accommodate the pairing correlations in the ground states of atomic nuclei are presented. As an application of the pairing theories, we investigate the spatial extension of weakly bound Ne and C isotopes by taking into account the pairing correlation with the Hartree-Fock-Bogoliubov (HFB) method and a 3-body model, respectively. We show that the odd-even staggering in the reaction cross sections of $^{30,31,32}$Ne and $^{14,15,16}$C are successfully reproduced, and thus the staggering can be attributed to the unique role of pairing correlations in nuclei far …
Explosive astrophysical systems - such as supernovae or compact star binary mergers - provide conditions where exotic degrees of freedom can be populated. Within the covariant density functional theory of nuclear matter we build several general purpose equations of state which, in addition to the baryonic octet, account for $Δ(1232)$ resonance states. The thermodynamic stability of $Δ$-admixed nuclear matter is investigated in the limiting case of vanishing temperature for charge fractions $Y_Q=0.01$ and $Y_Q=0.5$ and wide ranges of the coupling constants to the scalar and vector mesonic field…
Anapole moment of an exotic nucleus
我们证明，有没有明显的增强的anapole矩的$^{11}$ Be。小能量间隔的影响被晕中子波函数与堆芯的小重叠所补偿。
The density profile of exotic nuclei can be a rich source of information on the nuclear surface. In particular, the nuclear surface diffuseness parameter is correlated with the occupation probability of nucleons indistinct nuclear orbits, especially those with low angular momenta. The aim of this paper is to investigate the relationship between the nuclear surface diffuseness and spectroscopic information of neutron rich Ne and Mg isotopes both at the cusp and inside the island of inversion. We use the microscopic antisymmetrized molecular dynamics model to calculate these densities and other …
Theoretical study of elastic electron scattering off stable and exotic nuclei
弹性电子散射的核，计算与电荷密度的Skyrme力和协变的有效拉格朗日准确地描述核基态的结果进行了比较，实验稳定同位素。狄拉克分波计算进行了适应版本的ELSEPA包。出于这样一个事实，即在未来的设施中委托GSI和RIKEN升级的外来核的电子散射的研究，我们调查的理论预测，从缺中子到富中子同位素的锡和钙同位素链。电荷密度的协变相互作用，描述了低能量的电磁结构的核子内的拉格朗日的理论被用于这一目的。由于电荷密度是用平均场方法计算的，因此研究仅限于中重质量核。由于散射数据的实验分析通常涉及参数化的电荷密度，作为尚未探索的奇异核的替代练习，我们适合我们计算的平均场密度与Helm模型分布。这个过程是有帮助的散射观测量的中子数变化的研究，并使我们能够确定一些同位素链内的这些观测值之间的潜在利益的相关性。
Structure of the exotic nucleus $^{14}$B in the ground state
通过研究丰中子核$^{14}$ B在重靶库仑场中的分裂，研究了丰中子核B的结构。破碎振幅内的绝热以及破碎反应的有限范围DWBA理论计算。这两种形式主义允许使用现实的波函数之间的相对运动的碎片在基态的弹丸。用两种可能的$^{14}$ B基态组态计算了能量为60 MeV/核子的$^{14}$ B在重靶上碎裂后的纵向动量分布，并与最近的实验数据作了比较。数据似乎有利于$^{13}$ B（${3\over 2}^-)\otimes2s_{1/2}$作为$^{14}$ B的可能基态构型，光谱因子接近1。给出了$^{14}$ B单中子去除反应中中子角分布和相对能谱的预测。
Detecting bubbles in exotic nuclei
气泡的发生，由于反转的s $_{1/2}$状态通常位于上方，进行了研究。富含中子的氩同位素中的质子泡是最佳的候选者。配对的影响，可以发挥对气泡的形成进行评估。它们不能阻止非常富中子的氩同位素如$^{68}$ Ar中气泡的形成。这恳求在未来几年中，随着电子散射实验的出现，在下一代的异国情调的束设施，如FAIR或RIBF的电荷密度的测量富中子氩同位素。
Structure of Exotic Nuclei
讨论了极端中子质子比奇异核的模拟进展。强调两个主题：（i）普遍微观核能密度泛函的探索;（ii）连续壳模型的进展。
How Neutron Star Observations Point Towards Exotic Matter: Existing Explanations and a Prospective Proposal
本文提出一种缓慢稳定的混合星模型，以解释中子星观测中对奇异物质存在的支持，并探讨其在方程组参数调整中的挑战。
Effects of the Symmetry energy slope on the exotic content of the neutron stars
通过改变对称能斜率L，研究其对中子星内部奇异成分含量及宏观、微观量的影响，发现L对超子含量影响小，但可显著抑制Δ共振，且低L时奇异成分更明显。
The ground-state properties of neutron-rich exotic Na and Mg isotopes with even numbers of neutrons, N, are studied up to driplines. The shell-model calculations with an ab initio effective nucleon-nucleon interaction reported in [Tsunoda, Otsuka, Takayanagi et al., Nature 587, 66 (2020)] are extended to observables such as magnetic dipole and electric quadrupole moments, and charge and matter radii. Good agreements with experimental data are found, and predictions are shown up to driplines. A prescription to extract the deformation parameters for the eigenstates of Monte Carlo Shell Model is …
Neutron Dark Decay and Exotic Compact Objects
本研究通过中子暗衰变解释奇异致密天体的存在，提出暗物质与强子物质共存的内在机制，无需外部过程。
A generalized formula is provided, to calculate the M$_n$/M$_p$ ratio of the multipole transition matrix elements, in the framework of the so-called phenomenological analysis. It takes into account the possible difference between the neutron and proton radii and diffuseness, which can occur, especially in exotic nuclei. The validity domain of the original Bernstein formula is discussed, in the case of the proton scattering probe at few tens of MeV. The largest discrepancies are obtained for very neutron-rich nuclei (N/Z$\gtrsim$1.6) or when the electromagnetic deformation parameter is larger t…
We compute the charge radii of even-mass neon and magnesium isotopes from neutron number N = 8 to the dripline. Our calculations are based on nucleon-nucleon and three-nucleon potentials from chiral effective field theory that include delta isobars. These potentials yield an accurate saturation point and symmetry energy of nuclear matter. We use the coupled-cluster method and start from an axially symmetric reference state. Binding energies and two-neutron separation energies largely agree with data and the dripline in neon is accurate. The computed charge radii have an estimated uncertainty o…
A set of theoretical mass-radius relations for rigidly rotating neutron stars with exotic cores, obtained in various theories of dense matter, is reviewed. Two basic observational constraints are used: the largest measured rotation frequency (716 Hz) and the maximum measured mass ($2\;M_\odot$). Present status of measuring the radii of neutron stars is described. The theory of rigidly rotating stars in general relativity is reviewed and limitations of the slow rotation approximation are pointed out. Mass-radius relations for rotating neutron stars with hyperon and quark cores are illustrated u…
In this paper, a nice theoretical scheme is presented to investigate resonant and bound states in weakly bound nuclear systems by the use of isospectral potentials together with hyperspherical harmonics expansion. In this scheme, a new potential is constructed which is strictly isospectral with the original shallow potential and has properties that are desirable to calculate resonances more accurately and elegantly. The effectiveness of the method has been checked in terms of its application to the $0^+$ resonances in the neutron-rich isotopes $^{18,20}$C in the two-neutron plus core three-bod…
Shell-model studies on exotic nuclei around 132Sn
132 Sn周围奇异核的研究是当前实验和理论研究的热点。由于新的先进设施和技术，132 Sn附近的核的实验信息，长期以来一直无法进行光谱研究，现在可以获得。这些丰中子核的现有实验数据可能表明壳层结构发生了变化。事实上，它们与人们通过外推现有的N<82的结果所期望的结果有些不同，作为一种可能的解释，单质子能级方案的变化已经被提出。后者可能是由更弥散的核表面引起的，并且可以被看作是在更大的中子过剩时应该出现的主要效应的前兆。因此，新的数据提供了机会，以测试壳模型，并寻找一个可能的演变壳结构时，走向中子滴线。这刺激了该地区的壳模型研究。在这里，我们提出了一个概述最近的壳模型研究132 Sn邻居，关注那些计算采用现实的有效相互作用。
Recent experimental observation of magicity in $^{78}$Ni has infused the interest to examine the persistence of the magic character across the N$=$50 shell gap in extremely neutron rich exotic nucleus $^{78}$Ni in ground as well as excited states. A systematic study of Ni isotopes and N$=$50 isotones in ground state is performed within the microscopic framework of relativistic mean-field (RMF) and the triaxially deformed Nilson Strutinsky model (NSM). Ground state density distributions, charge form factors, radii, separation energies, pairing energies, single particle energies and the shell co…
Structural evolution in neutron-rich Os and W isotopes is investigated in terms of the Interacting Boson Model (IBM) Hamiltonian determined by (constrained) Hartree-Fock-Bogoliubov (HFB) calculations with the Gogny-D1S Energy Density Functional (EDF). The interaction strengths of the IBM Hamiltonian are produced by mapping the potential energy surface (PES) of the Gogny-EDF with quadrupole degrees of freedom onto the corresponding PES of the IBM system. We examine the prolate-to-oblate shape/phase transition which is predicted to take place in this region as a function of neutron number $N$ wi…
Neutron stars feature extremely high magnetic fields with deduced field strengths of $10^{15}$ G in the case of magnetars and potentially much higher values inside of the star. In this context we consider the appearance of $ρ^-$ meson condensation taking into account the effect of the magnetic field. The results show that, depending on parameters, such a condensation in magnetized neutron stars might (just) occur.
Fusion of light exotic nuclei at near-barrier energies : effect of inelastic excitation
本文研究了在近势垒能量下，奇异轻射弹（质子和中子丰）$^{17}$ F和$^{11}$ Be的非弹性激发对重靶聚变的影响。在耦合通道方法中进行了计算，其中，除了正常的耦合的基态的连续体，非弹性激发的束缚激发态和它的耦合的连续体的弹丸也被考虑在内。已发现包含这些额外的耦合对富中子$^{11}$ Be在$^{208}$ Pb上的聚变激发函数具有显著影响，而对于富质子$^{17}$ F在相同靶上的情况，已观察到该影响是标称的。在$^{11}$ Be的情况下，通道耦合对熔合过程的显著影响归因于其发育良好的晕结构。
On the Inner Crusts of Neo-Neutron Stars: exotic light nuclei, diffusional and thermodynamical stability
本文基于扩展核统计平衡模型研究新中子星内壳层，发现深层存在几乎纯净的富中子轻核层，并证明其扩散稳定且团簇化消除了亚饱和核物质的密度不稳定性。
Unfolding of exotic near-threshold structure and decay dynamics in $^{17}$B
研究$^{17}$B中奇特近阈值结构和衰变动力学，揭示γ衰变与双中子衰变竞争机制及多路径干涉效应。
In this work, we study the effect of differential rotation, finite temperature and strangeness on the quasi stationary sequences of hyper massive neutron stars (HMNS). We generate constant rest mass sequences of differentially rotating and uniformly rotating stars. The nucleonic matter relevant to the star interior is described within the framework of the relativistic mean field model with the DD2 parameter set. We also consider the strange $Λ$ hyperons using the BHB$Λϕ$ equation of state (EoS). Additionally, we probe the behaviour of neutron stars (NS) with these compositions at different tem…
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