核子

We first use perturbative QCD theory to calculate the photon production cross section in nu- cleon - nucleon collisions at a center-of-mass energy of a few tens of GeV, taking into account the intrinsic parton transverse mo- mentum distribution and the next-to-leading-order contributions.

首先我们用微扰量子色动力学理论计算质心能量几十GeV核子核子碰撞中光子产生截面，同时考虑了部分子内禀横动量分布和二级费曼图的贡献。

Plus neutrons, in the nucleus cloud chamber photograph, an unknown nucleus collides with a 44He nucleus, and after the collision tHe nucleus, and after the collision the two he two particles nuclei nuclei travel in perpendicular directions relative to each other.travel in perpendicular directions relative

如右图所示，在如右图所示，在44HeHe（左上角的数字为核子数，即在核子中的质子和中子数之和）云室照片中，一个未知核子与（左上角的数位为核子数，即在核子中的质子和中子数之和）云室照片中，一个未知核子与44HeHe核子碰撞，碰撞后两个核子以彼此垂直的方向运动。

The contradiction between the quark spin structure of nucleon of the constituent quark model and the measured one in the polarized deep inelastic lepton nucleon scattering has been explained in detail.

简要介绍了夸克的发现、核子的夸克模型，详细讨论了夸克模型中核子内夸克自旋结构和极化轻子-核子深度非弹散射测量出的夸克自旋结构中的矛盾。

In the past years, the chiral SU(3) quark model has achieved success. In this model, the nonet pseudo-scalar meson exchanges and the nonet scalar meson exchanges are considered in describing the medium-and long-range parts of the interactions, and the one gluon exchange describe the short-range repulsion.

过去几年来，手征SU(3)夸克模型已经取得了相当的成功，应用该模型统一地解释了重子基态的能谱，核子-核子以及核子-超子散射过程，并由此预言了实验上可能存在的双重子束缚态。

EMC effects reflect that free nucleon structure functions are different from bound nucleon.

EMC效应的发现反映了自由核子与束缚核子的结构函数明显不同，核环境可以影响核子的内部结构。

The calculations of nucleus-nucleus potential are carried out in the framework of double folding model with M3Y-Reid and M3Y-Paris effective nucleon-nucleon interactions. The exchange part of the interaction, which is taken to be of finite range and the density dependence of NN interaction, is accounted for in the folding procedure. The results are used as the real part of the optical potential for heavy ion scattering.

用双折叠模型计算了核核碰撞的相互作用势，其中核子-核子相互作用势采用M3Y-Reid和M3Y-Paris形式，交换部分考虑了有限力程的密度依赖的核子-核子相互作用，程序用于重离子散射光学势实部的计算。

Nucleoneffective interactions in the RMF are extracted by reproducing the properties ofsymmetric and asymmetric nuclear matter in the DBHF calculation. It is found thatthe properties of finite nuclei are depicted satisfactorily by those effective interactions.

用DBHF计算的对称和不对称核物质中核子自能或核子平均结合能在RMF下得到的同位旋相关的核子有效相互作用可以很好地描述有限核的性质。

In the past years, SU (3) chiral quark model has been used successfully in explaining the experimental data of groundstate baryons, nucleon-nucleon and nucleonhyperon scattering etc..

过去，手征SU（3）夸克模型在解释基态重子结构和性质、核子-核子及核子-超子散射等方面的实验数据中取得了成功。

Content: The chiral SU(3) quark model has achieved success in explaining the ground statestructure and natrue of baryon, the experimental data in such respects as the nucleon-the nucleonand the nucleon-the hyperon scattering, etc..

手征SU(3)夸克模型在解释基态重子结构和性质、核子-核子及核子-超子散射等方面的实验数据中取得了成功。

If we want to get the effective mass by the method of computing the meson self-energy , we need to consider the change of the effective mass of the nucleon along with the increasing density of the nuclear matter,namely considering the fluctuation of the vaccum.

很多研究[3，4，5，6，11，12]表明了上式描述的规律是正确的，如果用计算介子自能的方法来得到介子的有效质量，需要考虑核子的有效质量的随核物质的密度的变化，即需要考虑核子的真空涨落，当不考虑核子有效质量随核物质密度变化的时候，ρ介子、ω介子的有效质量一般是上升的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。