momentum density 中文意思是什麼
momentum density
解釋
動量密度-
By using the multi - configuration dirac - fock ( mcdf ) method, the effects of relaxation and correlation on the transition energies and probabilities of electric - dipole allowed ( el ) resonance and intercombination transitions for 2p53s3 - 2p6 in neutral neon have been systematically studied firstly. and the results of the transition energies and probabilities ( lifetimes ) in length and velocity gauge have been presented. during the calculation, in order to consider the rearrangement effects of the bound - state density and some important correlations, the asfs of transition initial - and final - states were divided according to their angular - momentum and parity and calculated, and different number of csfs were included in the expansion of asfs
本文利用多組態dirac - fork （ mcdf ）理論方法，通過對輻射躍遷初、末態電子波函數的獨立計算以及在原子態波函數的展開中考慮不同數量的組態波函數，系統地研究了弛豫和相關效應對中性ne原子2p ~ 53s ~ （ 1 . 3 ） p _ 1 ~ o - 2p ~ 6 ~ 1s _ 0電偶極共振和復合躍遷的能量以及躍遷幾率的影響，給出了長度和速度兩種不同規范下激發態的能量和輻射壽命；以中性ne原子的研究為基礎，進一步研究了類ne等電子系列離子（ z = 11 - 18 ）較低的激發組態2p ~ 53s和基組態2p ~ 6的能級結構以及各能級間的輻射躍遷特性。 -
The results show that binding energies per nucleon at each density and various asymmetry parameters fulfill the empirical parabolic law and the asymmetry energy is density dependent. it is found that both scalar and vector potentials of neutron in the neutron rich nuclear matter become stronger although the isospin dependence is not stronger. we compare our results with those in a simple method, where the dbhf nucleon self - energies are extracted from the momentum dependence of the single - particle energy
首先我們要求在每一個密度及各種不對稱系數的核物質中，相對論平均場（ rmf ）計算出的核子標量與矢量自能與dbhf計算出的標量與矢量自能一致，從而得到在rmf下的密度依賴的有效介子核子耦合常數，包括同位旋標量介子。 -
Therefore we could carry out numerical calculations and obtain the reaction cross section, the nucleon removal cross section and the momentum distribution in the scattering of a halo nucleus with any types of density distributions. we compare the reaction cross sections calculated in the few - body glauber theory and the optical - limit glauber theory
進一步對27p 、 28p反應截面的研究分析表明，考慮核芯2751的增大可以很好解釋實驗測量得到28p反應截面的增大，而要解釋27p反應截面的異常增大，需要同時考慮核芯2 「 si增大和具有非常彌散空間分佈的2s ， ， :態暈核子。 -
A similar consideration can be used to define the density of momentum, the density of energy, and so on.
可以用類似的方法定義動量密度，能量密度等等。 -
Particularly an analytical expression for the longitudinal momentum distribution is derived if the density distribution of halo nucleons is assumed as a gaussian type function. a direct connection of the width of the momentum distribution to the bound state wave function of halo nucleons is established
特別是在暈核子的縱向和橫向密度分佈可分離的情況下，如高斯密度分佈，進一步求解了縱向動量分佈寬度的解析形式，建立了分佈寬度與暈核子束縛態波函數之間的直接聯系。 -
As the representation of the electron spin angular momentum is two - dimensional or three - dimensional, the electron energy is calculated simplier by the theory of density matrix and average value
當電子在磁場中的自旋角動量的表示為二維和三維時，應用密度矩陣原理求解其能量更為簡便。 -
Moreover, the secondary wall - impingement distance should be properly reduced in order that the bump play a part in the formation of lean mixture with the increase of environmental pressure or density owing to both the increase of air entrainment, momentum losses and the decrease of the spray tip velocity and penetration
而且當壓力或密度較高時，由於噴霧的空氣卷吸量及動量損失增大，貫穿速度降低及貫穿距減小，為使bump發揮作用，應適當減小二次撞壁距離。 -
Momentum density tensor
動量密度張量
分享友人