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Nuclear de-excitations in low-energy charged-current νe scattering on Ar40 Ar40上低能带电电流νe散射中的核去激发
Pub Date : 2020-10-05 DOI: 10.1103/PHYSREVC.103.044604
S. Gardiner
Background: Large argon-based neutrino detectors, such as those planned for the Deep Underground Neutrino Experiment (DUNE), have the potential to provide unique sensitivity to low-energy ($sim$10 MeV) electron neutrinos produced by core-collapse supernovae. Despite their importance for neutrino energy reconstruction, nuclear de-excitations following charged-current $nu_e$ absorption on $^{40}$Ar have never been studied in detail at supernova energies. Purpose: I develop a model of nuclear de-excitations that occur following the $^{40}mathrm{Ar}(nu_e,e^{-})^{40}mathrm{K}^*$ reaction. This model is applied to the calculation of exclusive cross sections. Methods: A simple expression for the inclusive differential cross section is derived under the allowed approximation. Nuclear de-excitations are described using a combination of measured $gamma$-ray decay schemes and the Hauser-Feshbach statistical model. All calculations are carried out using a novel Monte Carlo event generator called MARLEY (Model of Argon Reaction Low Energy Yields). Results: Various total and differential cross sections are presented. Two de-excitation modes, one involving only $gamma$-rays and the other including single neutron emission, are found to be dominant at few tens-of-MeV energies. Conclusions: Nuclear de-excitations have a strong impact on the achievable energy resolution for supernova $nu_e$ detection in liquid argon. Tagging events involving neutron emission, though difficult, could substantially improve energy reconstruction. Given a suitable calculation of the inclusive cross section, the MARLEY nuclear de-excitation model may readily be applied to other scattering processes.
背景:大型氩基中微子探测器,如那些计划用于深地下中微子实验(DUNE)的探测器,有可能为核心坍缩超新星产生的低能($sim$ 10 MeV)电子中微子提供独特的灵敏度。尽管它们对中微子能量重建很重要,但在$^{40}$ Ar上带电电流$nu_e$吸收后的核去激发从未在超新星能量下进行过详细研究。目的:我开发了一个核去激发的模型,发生在$^{40}mathrm{Ar}(nu_e,e^{-})^{40}mathrm{K}^*$反应之后。该模型适用于排他性截面的计算。方法:在允许的近似下,推导出包含微分截面的简单表达式。使用测量的$gamma$射线衰变方案和hauser - feshach统计模型的组合来描述核去激发。所有的计算都是使用一种叫做MARLEY(氩反应低能产率模型)的新型蒙特卡罗事件发生器进行的。结果:给出了不同的总横截面和差横截面。两种去激发模式,一种只涉及$gamma$射线,另一种包括单中子发射,在几十兆电子伏特的能量下占主导地位。结论:核去激发对液态氩中超新星$nu_e$探测的能量分辨率有很大影响。标记涉及中子发射的事件虽然困难,但可以大大改善能量重建。给出合适的包涵截面计算,MARLEY核去激励模型可以很容易地应用于其他散射过程。
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引用次数: 10
Hyperon halo structure of C and B isotopes C和B同位素的超子晕结构
Pub Date : 2020-09-28 DOI: 10.1103/PHYSREVC.103.034321
Ying Zhang, H. Sagawa, E. Hiyama
We study the hypernuclei of C and B isotopes by Hartree-Fock model with Skyrme-type nucleon-nucleon and nucleon-hyperon interactions. The calculated $Lambda$ binding energies agree well with the available experiment data. We found halo structure in the hyperon $1p$-state with extended wave function beyond nuclear surface in the light C and B isotopes. We also found the enhanced electric dipole transition between $1p$- and $1s$-hyperon states, which could be the evidence for this hyperon halo structure.
我们用具有skyrme型核子-核子和核子-超子相互作用的Hartree-Fock模型研究了C和B同位素的超核。计算得到的$Lambda$结合能与现有实验数据吻合较好。在轻C和轻B同位素中发现了超子$1p$-态的光晕结构,其波函数扩展到核表面以外。我们还发现$1p$-和$1s$-超子态之间的电偶极子跃迁增强,这可能是这种超子晕结构的证据。
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引用次数: 1
Chiral crossover transition from the Dyson-Schwinger equations in a sphere 球中Dyson-Schwinger方程的手性交叉跃迁
Pub Date : 2020-09-25 DOI: 10.1103/physrevd.102.114011
Yingru Xu, Chao Shi, Xiao-Tao He, H. Zong
Within the framework of Dyson--Schwinger equations of QCD, we study the effect of finite volume on the chiral phase transition in a sphere with the MIT boundary condition. We find that the chiral quark condensate $langlebar{psi} psirangle$ and pseudotransition temperature $T_{pc}$ of the crossover decreases as the volume decreases, until there is no chiral crossover transition at last. We find that the system for $R = infty $ fm is indistinguishable from $R=10$ fm and there is a significant decrease in $T_{pc}$ with $R$ as $R<4$ fm. When $R<1.5$ fm, there is no chiral transition in the system.
在QCD的Dyson—Schwinger方程的框架内,研究了有限体积对具有MIT边界条件的球的手性相变的影响。研究发现,随着体积的减小,交叉的手性夸克凝结物$langlebar{psi} psirangle$和赝跃迁温度$T_{pc}$逐渐降低,直至最终不发生手性交叉跃迁。我们发现$R = infty $ fm的系统与$R=10$ fm无法区分,并且$T_{pc}$与$R$作为$R<4$ fm显著减少。当$R<1.5$ fm时,系统中没有手性过渡。
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引用次数: 1
Novel regularization scheme for nucleon-nucleon lattice simulations with effective field theory 基于有效场论的核子-核子晶格模拟的新正则化方案
Pub Date : 2020-09-25 DOI: 10.1103/PhysRevC.102.044001
M. Ahmadi, M. Hadizadeh, M. Radin, S. Bayegan
We propose a new regularization scheme to study the bound state of two-nucleon systems in Lattice Effective Field Theory. Inspired by continuum EFT calculation, we study an exponential regulator acting on the leading-order (LO) and next-to-leading order (NLO) interactions, consisting of local contact terms. By fitting the low-energy coefficients (LECs) to deuteron binding energy and the asymptotic normalization coefficient (ANC) on a lattice simulation, we extract the effective range expansion (ERE) parameters in the $^3S_1$ channel to order $p^2$. We explore the impact of different powers of the regulator on the extracted ERE parameters for the lattice spacing $a=1.97$ fm. Moreover, we investigate how the implementation of the regularization scheme improves the predicted ERE parameters on the lattice spacing in the range of $1.4 le a le 2.6$ fm. Our numerical analysis indicates that for lattice spacing greater than $2$ fm, the predicted observables are very close to the experimental data.
我们提出了一种新的正则化方案来研究晶格有效场论中二核子系统的束缚态。受连续统EFT计算的启发,我们研究了一种作用于由局部接触项组成的前阶(LO)和次阶(NLO)相互作用的指数调节器。通过在晶格模拟上拟合氘子结合能的低能系数(LECs)和渐近归一化系数(ANC),我们提取了$^3S_1$通道中p^2$阶的有效范围扩展(ERE)参数。我们探讨了在晶格间距$a=1.97$ fm时,不同功率的调节器对提取的ERE参数的影响。此外,我们还研究了正则化方案的实现如何在$1.4 le至$ 2.6$ fm的晶格间距范围内改善预测的ERE参数。我们的数值分析表明,当晶格间距大于$2$ fm时,预测的观测值与实验数据非常接近。
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引用次数: 2
Proximity effect of pair correlation in the inner crust of neutron stars 中子星内壳中对相关的邻近效应
Pub Date : 2020-09-24 DOI: 10.1093/ptep/ptaa174
Toshiyuki Okihashi, M. Matsuo
We study proximity effect of pair correlation in the inner crust of neutron stars by means of the Skyrme-Hartree-Fock-Bogoliubov theory formulated in the coordinate space. We describe a system composed of a nuclear cluster immersed in neutron superfluid, which is confined in a spherical box. Using a density-dependent effective pairing interaction which reproduces both the pair gap of neutron matter obtained in ab initio calculations and that of finite nuclei, we analyze how the pair condensate in neutron superfluid is affected by the presence of the nuclear cluster. It is found that the proximity effect is characterized by the coherence length of neutron superfluid measured from the edge position of the nuclear cluster. The calculation predicts that the proximity effect has a strong density dependence. In the middle layers of the inner crust with baryon density $5 times 10^{-4}$ fm$^{-3} 5 times 10^{-2}$ fm$^{-3}$.
利用坐标空间中的Skyrme-Hartree-Fock-Bogoliubov理论,研究了中子星内壳中对相关的邻近效应。我们描述了一个由浸没在中子超流体中的核团组成的系统,该系统被限制在一个球形盒子中。利用密度相关的有效配对相互作用,再现了从头计算得到的中子物质的对间隙和有限原子核的对间隙,我们分析了核团的存在如何影响中子超流体中的对凝聚。从核团簇边缘位置测量的中子超流体相干长度表征了邻近效应。计算结果表明,邻近效应具有较强的密度依赖性。在内地壳的中间层,重子密度为$5 乘以10^{-4}$ fm$^{-3}$ 5 乘以10^{-2}$ fm$^{-3}$。
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引用次数: 2
Magnetic field effect on the pion superfluid 磁场对介子超流体的影响
Pub Date : 2020-09-24 DOI: 10.1103/PhysRevD.102.114006
S. Mao
Magnetic field effect on pion superfluid phase transition is investigated in frame of a Pauli-Villars regularized NJL model. Instead of directly dealing with charged pion condensate, we apply the Goldstone's theorem (massless Goldstone boson $pi^+$) to determine the onset of pion superfluid phase, and obtain the phase diagram in magnetic field, temperature, isospin and baryon chemical potential space. At weak magnetic field, it is analytically proved that the critical isospin chemical potential of pion superfluid phase transition is equal to the mass of $pi^+$ meson in magnetic field. The pion superfluid phase is retarded to higher isospin chemical potential, and can survive at higher temperature and higher baryon chemical potential under external magnetic field.
在Pauli-Villars正则化NJL模型框架下研究了磁场对介子超流体相变的影响。我们不直接处理带电介子凝聚体,而是应用Goldstone定理(无质量Goldstone玻色子$pi^+$)来确定介子超流体相的起始,得到了在磁场、温度、同位旋和重子化学势空间中的相图。在弱磁场下,解析证明了介子超流体相变的临界同位旋化学势等于磁场中介子的质量。介子超流体相被延迟到更高的同位旋化学势,并能在外磁场下在更高的温度和更高的重子化学势下存活。
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引用次数: 4
Phenomenological quark-hadron equations of state with first-order phase transitions for astrophysical applications
Pub Date : 2020-09-22 DOI: 10.1103/physrevd.103.023001
N. Bastian
In the current work an equation of state model with a first-order phase transition for astrophysical applications is presented. The model is based on a two-phase approach for quark-hadron phase transitions, which leads by construction to a first-order phase transition. The resulting model has already been successfully used in several astrophysical applications, such as cold neutron stars, core-collapse supernova explosions and binary neutron star mergers. Main goal of this work is to present the details of the model, discuss certain features and eventually publish it in a tabulated form for further use.
本文提出了一种天体物理应用的一阶相变状态方程模型。由此产生的模型已经成功地应用于几个天体物理应用,如冷中子星、核心坍缩超新星爆炸和双中子星合并。这项工作的主要目标是展示模型的细节,讨论某些特征,并最终以表格形式发布以供进一步使用。
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引用次数: 11
Variational and parquet-diagram calculations for neutron matter. II. Twisted chain diagrams 中子物质的变分和拼格图计算。2扭链图
Pub Date : 2020-09-22 DOI: 10.1103/physrevc.102.064305
E. Krotscheck, J. Wang
We develop a manifestly microscopic method to deal with strongly interacting nuclear systems that have different interactions in spin-singlet and spin-triplet states. In a first step we analyze variational wave functions that have been suggested to describe such systems, and demonstrate that the so-called commutator contributions can have important effects whenever the interactions in the spin-singlet and the spin-triplet states are very different. We then identify these contributions as terms that correspond, in the language of perturbation theory, to non-parquet diagrams. We include these diagrams in a way that is suggested by the Jastrow-Feenberg approach and show that the corrections from non-parquet contributions are, at short distances, larger than all other many-body effects.
我们开发了一种明显的微观方法来处理在自旋单重态和自旋三重态中具有不同相互作用的强相互作用核系统。在第一步,我们分析了已经被建议用来描述这种系统的变分波函数,并证明了所谓的换向子贡献可以在自旋-单重态和自旋-三重态的相互作用非常不同的情况下产生重要的影响。然后,我们将这些贡献识别为在微扰理论的语言中对应于非拼花图的术语。我们以Jastrow-Feenberg方法建议的方式包括这些图,并表明非拼木地板贡献的修正在短距离上大于所有其他多体效应。
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引用次数: 1
Pairing vibrations in the interacting boson model based on density functional theory 基于密度泛函理论的相互作用玻色子模型中的配对振动
Pub Date : 2020-09-22 DOI: 10.1103/physrevc.102.054313
K. Nomura, D. Vretenar, Z. P. Li, J. Xiang
We propose a method to incorporate the coupling between shape and pairing collective degrees of freedom in the framework of the interacting boson model (IBM), based on the nuclear density functional theory. To account for pairing vibrations, a boson-number non-conserving IBM Hamiltonian is introduced. The Hamiltonian is constructed by using solutions of self-consistent mean-field calculations based on a universal energy density functional and pairing force, with constraints on the axially-symmetric quadrupole and pairing intrinsic deformations. By mapping the resulting quadrupole-pairing potential energy surface onto the expectation value of the bosonic Hamiltonian in the boson condensate state, the strength parameters of the boson Hamiltonian are determined. An illustrative calculation is performed for $^{122}$Xe, and the method is further explored in a more systematic study of rare-earth $N=92$ isotones. The inclusion of the dynamical pairing degree of freedom significantly lowers the energies of bands based on excited $0^+$ states. The results are in quantitative agreement with spectroscopic data, and are consistent with those obtained using the collective Hamiltonian approach.
基于核密度泛函理论,提出了一种在相互作用玻色子模型(IBM)框架下结合形状和配对集体自由度之间耦合的方法。为了解释配对振动,引入了玻色子数非守恒的IBM哈密顿量。利用基于普适能量密度泛函和配对力的自洽平均场计算解,在轴对称四极子和配对本征变形约束下构造哈密顿量。通过将得到的四极配对势能面映射到玻色子凝聚态的玻色子哈密顿量的期望值上,确定了玻色子哈密顿量的强度参数。对$^{122}$Xe进行了说明计算,并在更系统的稀土$N=92$等音研究中进一步探索了该方法。动态配对自由度的加入显著降低了基于激发态$0 +$的能带的能量。结果与光谱数据在定量上一致,并与使用集体哈密顿方法得到的结果一致。
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引用次数: 3
Relation between transition density and proton inelastic scattering by C12 target at Ep=65 and 200 MeV 跃迁密度与C12靶在Ep=65和200 MeV下质子非弹性散射的关系
Pub Date : 2020-09-22 DOI: 10.1103/PHYSREVC.103.044602
T. Furumoto, M. Takashina
We calculate proton elastic and inelastic scatterings with a microscopic coupled channel (MCC) calculation. The diagonal and coupling potentials including the spin-orbit part are obtained by folding a complex $G$-matrix effective nucleon-nucleon interaction with a transition density. This is the first time that the present folding prescription for the spin-orbit part is applied to the proton inelastic scattering. We apply the MCC calculation to the proton elastic and inelastic (0$^+_2$) scatterings by $^{12}$C target at $E_p$ = 65 and 200 MeV, respectively. The role of diagonal and coupling potentials for the central and spin-orbit parts is checked. In addition, the relation between the transition density and the proton inelastic scattering is investigated with the modified wave function and the modified transition density, respectively. The inelastic cross section is sensitive to the strength and shape of the transition density, but the inelastic analyzing power is sensitive only to the shape of that. Finally, we make clear the property of the inelastic analyzing power derived from the transition density without an ambiguity.
我们用微观耦合通道(MCC)计算质子弹性散射和非弹性散射。对角线势和耦合势包括自旋轨道部分,是通过折叠具有跃迁密度的复G矩阵有效核子-核子相互作用得到的。这是首次将自旋轨道部分的折叠公式应用于质子非弹性散射。我们将MCC计算分别应用于$^{12}$C靶在$E_p$ = 65和$ 200mev下的质子弹性和非弹性(0$^+_2$)散射。对角线势和耦合势对中心和自旋轨道部分的作用进行了检验。此外,利用修正波函数和修正跃迁密度分别研究了跃迁密度与质子非弹性散射的关系。非弹性截面对过渡密度的强度和形状敏感,但非弹性分析能力只对过渡密度的形状敏感。最后,明确了由跃迁密度导出的非弹性分析功率的性质,没有歧义。
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引用次数: 0
期刊
arXiv: Nuclear Theory
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