Nuclear Halo-Like Phenomena of 6,8He and Nuclear Short Range Correlation

Based on the nuclear short range correlation in a halo-like nucleus, theoretical analysis of the experimental cross sections for small-angle elastic p-^4,6,8 He scattering at the energy of about 0.7 GeV has been performed in the framework of Glauber multiple scattering theory. Our theoretical calculations reproduce the corresponding experimental data quite successfully. These good agreements confirm that the nuclear halo-like phenomena may originate from the short range correlation between nucleons in a halo-like nucleus.     

Nuclear Halo-Like Phenomena and Short-Range Nuclear Correlation

Based on Glauber Multiple Scattering Theory, high-energy proton elastic scattering on halo-like nucleus ^13C is studied in a single nucleon wave function with low angular momentum configurations. A great agreement with experimental data is obtained and the theoretical prediction clearly shows that 13U has a neutron halo-like structure.Then, the origin and nature of nuclear halo phenomena are explained in terms of nuclear short-range correlations. Our conclnsion shows ttiat the origin of nuclear halo-like phenomena originates from short range nuclear correlation.     

Nuclear Halo-Like Phenomena and Short-Range Nuclear Correlation

Based on Glauber Multiple Scattering Theory, high-energy proton elastic scattering on halo-like nucleus 13C is studied in a single nucleon wave function with low angular momentum configurations. A great agreement with experimental data is obtained and the theoretical prediction clearly shows that 13 C has a neutron halo-like structure.Then, the origin and nature of nuclear halo phenomena are explained in terms of nuclear short-range correlations. Our conclusion shows that the origin of nuclear halo-like phenomena originates from short range nuclear correlation.     

Nuclear Short range correlations in finite nuclei

The short-range correlations between nucleons in finite nuclei are investigated in the framework of Glauber multiple scattering theory without any free parameters. The effects on proton-nucleus and nucleus - nucleus interactions such as p - {4}He$ and {4}He- {12}C elastic scattering, and in particular the proton elastic scattering off hallo-like nuclei, {6,8}He, are estimated. Our calculations show that the short-range correlations play an important role in reproducing experimental data and could be also thought of as being the origin and nature of halo-like phenomena in the nuclear structure. More accurate calculations along this line are needed.     

Short range correlations between nucleons in finite nuclei

The short-range correlation between nucleons in finite nuclei is investigated in high energy protonnucleus and α-nucleus elastic scattering in the framework of Glauber multiple scattering theory without any free parameters. The effects on the p-4He and 4He-12C elastic scattering, and in particular on the proton elastic scattering off hallo-like nuclei, 6,8He, are estimated. Our calculations show that the short-range correlations play an important role in reproducing experimental data and could be also thought of as being possible origin and nature of halo-like phenomena in the nuclear structure. More accurate calculations along this line are needed.     

13C的一个可能的类晕的中子2p态

假设13C是单粒子的2p态的结构,用Glauber多重散射理论研究了入射能量为1GeV的质子在13C上的弹性散射,得到了与实验符合得很好的理论结果.这说明13C可能存在着一个类晕的中子皮.     

A Possible Halo-Like Neutron 2p States of 13C

Assuming a single-particle 2p structure of ¹³C, we study proton-¹³C elastic scattering at the incident energy of 1 GeV in the Glauber multiple scattering theory. A good agreement between theoretical prediction and corresponding experimental data is obtained. The result evidently indicates a possible halo-like neutron skin of ¹³C.     

High-energy phenomena,short-range nuclear structure and QCD

A systematic review and theoretical analysis of the experimental data on multi GeV lepton, photon, hadron, deuteron (nucleus) reactions from nuclei forbidden in the case of scattering from free nucleons is presented. It is shown that all these data can be quantitatively described as a manifestation of short-range few nucleon correlations. Calculations for elastic and (deep)inelastic electromagnetic and weak form factors of the deuteron and other nuclei, are given. The inclusive production of leading particles in the nucleus fragmentation region in high-energy lepton, hadron or nucleus-induced collisions is analyzed. The straightforward correspondence between the Weinberg equation for the light-cone wave functions of the deuteron and the non-relativistic Schrödinger equation is found. It is shown that the predictions of quantum chromodynamics for short-distance phenomena in nuclei are in agreement both with experimental data and theoretical expectations due to short range correlations in nuclei. Several feasible experiments are considered which could establish the existence of relativistic nuclear physics.     

Nuclear and neutron star radii

We investigate the correlation between nuclear neutron radii and the radius of neutron stars. We use a well-established hadronic SU(3) model based on chiral symmetry that naturally includes nonlinear vector meson and scalar meson–vector meson couplings. The relative strengths of the couplings modify the nuclear isospin-dependent interactions. We study the dependence of nuclear and neutron star radii on the coupling strengths. The relevance of the results for parity-violating electron–nucleus scattering is discussed.     

能量损失效应引起的核Drell-Yan微分截面比的压低

核环境中夸克的能量损失可以通过高能核Drell-Yan过程的核依赖进行测量. 利用文献中给出的夸克能量损失公式和从轻子－原子核深度非弹性散射实验数 据得到的束缚核子中的部分子分布函数, 计算了FNAL E772 800GeV的质子打击不同原子核的Drell-Yan过程截面比, 发现考虑能量损失的计算结果与FNAL E772实验数据符合甚好. 建议在利用核Drell-Yan过程实验数据抽取束缚核子内部分子分布函数时应该考虑能量损失效应.     

Nuclear effects in atomic transitions

Atomic electrons are sensitive to the properties of the nucleus they are bound to, such as nuclear mass, charge distribution, spin, magnetisation distribution, or even excited level scheme. These nuclear parameters are reflected in the atomic transition energies. A very precise determination of atomic spectra may thus reveal information about the nucleus, otherwise hardly accessible via nuclear physics experiments. This work reviews theoretical and experimental aspects of the nuclear effects that can be identified in atomic structure data. An introduction to the theory of isotope shifts and hyperfine splitting of atomic spectra is given, together with an overview of the typical experimental techniques used in high-precision atomic spectroscopy. More exotic effects at the borderline between atomic and nuclear physics, such as parity violation in atomic transitions due to the weak interaction, or nuclear polarisation and nuclear excitation by electron capture, are also addressed.     

Nuclear clusters and nuclear molecules

The idea that clusters of nucleons might exist in the nucleus has a long history and dates back to the earliest days of nuclear physics. Recently there have been significant advances in our theoretical treatment of clustering and in the experimental methods available to identify cluster structure in nuclei. These developments are reviewed with particular reference to the²⁴Mg nucleus where a rich variety of cluster configurations is observed.     

K~+-核散射研究进展

本文简要回顾了K+ 核散射实验和理论方面近几年的研究进展。我们通过把介质中的K+ 核子相互作用与介质中的夸克凝聚联系起来 ,计算了K+ 核相互作用的非传统机制的贡献。结果表明核密度相关的介质内夸克凝聚可以解释K+ 核散射中的非传统介质效应。     

K~ -核散射研究进展

本文简要回顾了K 核散射实验和理论方面近几年的研究进展。我们通过把介质中的K 核子相互作用与介质中的夸克凝聚联系起来 ,计算了K 核相互作用的非传统机制的贡献。结果表明核密度相关的介质内夸克凝聚可以解释K 核散射中的非传统介质效应。     

INVESTIGATION OF THE EFFECT OF NUCLEAR SHORT RANGE CORRELATION IN HEAVY ION SCATTERING

Bassed on the "Rigid Projectile" approximation and the Glauber's multiple scattering theory. The influence of the nuclear short range correlation on elastic scattering of high energy heavy ion is discussed. The elastic α-¹²C scattering at 1.37 GeV is calculated and compared with experimential data. It is show that the influence of the unclear short range correlation on differential cross section is quite important.     

Rovibrationally Averaged Nuclear Shielding Constants in OCS

The nuclear shielding constants in OCS are studied using ab initio theoretical methods and gas-phase NMR measurements. The shielding surfaces are calculated and the rovibrational effects and the resulting temperature dependence are analyzed. The temperature dependence of¹³C shielding in the gas phase is determined experimentally in the range 278–373 K.¹³C is the single nucleus for which the experimental data for the temperature dependence can be converted to a reference-independent scale, and good agreement of the measured and calculated ab initio results is observed. For³³S, we discuss a new, more accurate absolute shielding scale.     

深度学习在核物理中的应用

深度学习是目前最好的模式识别工具,预期会在核物理领域帮助科学家从大量复杂数据中寻找与某些物理最相关的特征。本文综述了深度学习技术的分类,不同数据结构对应的最优神经网络架构,黑盒模型的可解释性与预测结果的不确定性。介绍了深度学习在核物质状态方程、核结构、原子核质量、衰变与裂变方面的应用,并展示如何训练神经网络预测原子核质量。结果发现使用实验数据训练的神经网络模型对未参与训练的实验数据拥有良好的预测能力。基于已有的实验数据外推,神经网络对丰中子的轻原子核质量预测结果与宏观微观液滴模型有较大偏离。此区域可能存在未被宏观微观液滴模型包含的新物理,需要进一步的实验数据验证。     

Nuclear effects in deep inelastic scattering of charged-current neutrino off nuclear target

The nuclear effects in the neutrino–nucleus charged-current inelastic scattering process is studied by analyzing the CCFR and NuTeV data. The structure functions F₂(x,Q²) and xF₃(x,Q²) as well as differential cross sections are calculated by using CTEQ parton distribution functions and the EKRS and HKN nuclear parton distribution functions, and these are compared with the CCFR and NuTeV data. It is found that the corrections of the nuclear effect to the differential cross section for the charged-current antineutrino scattering on the nucleus are negligible, the EMC effect exists in the neutrino structure function F₂(x,Q²) in the large x region, the shadowing and anti-shadowing effect occur in the distribution functions of valence quarks in the small and medium x region, respectively. It is also found that shadowing effects on F₂(x,Q²) in the small x region in the neutrino–nucleus and the charged-lepton–nucleus deep inelastic scattering processes are different. It is clear that the neutrino–nucleus deep inelastic scattering data should further be employed in restricting the nuclear parton distributions. PACS 13.15.+g; 24.85.+p; 25.30.-c