1S0 and 3S13D1 nucleon-nucleon potentials in the quark compound bag model

For nucleons interacting via formation of the quark compound bag the resulting potential is written in a general form. Explicit examples of potentials are constructed in the ¹S₀, ³S₁ and ³S₁-³D₁ states fitted to the experimental data at T_L ? 1 GeV. As an outcome the QCB energy levels (dibaryons) and NN admixture in QCB are obtained in good agreement with theoretical predictions.     

Regarding the 21S0 and 23S1 multiplets

<正>This paper discusses the masses and possible members of 2¹S₀ and 2³S₁ meson multiplets in the framework of meson-meson mixing and Regge phenomenology.For the 2¹S₀ meson nonet,K^*（1460） may be the observed state of the 2¹S₀ isodoublet with a mass of 1400 MeV and the mass ofω（1420） is 1412 MeV.For the 2³S₁ meson nonet,K^*（1410） seems too light to be the 2³S₁ ns member.The fact that the agreement between the present findings and those given by experiments and other different approaches is satisfactory implies that the assignments in this paper may be reasonable.     

Durees de vie des niveaux 1D2 ET 1S0 du magnesium

Radiative lifetimes of the excited n¹S₀ (n = 4, 5) and n¹D₂ (n = 3, 4) states in magnesium have been measured by time resolved fluorescence technique using two photon excitation.     

Impact broadening and shifts for 6sns 1S0 and 6snd 1D2 series of barium

Impact broadening and shifts of Ba transitions to parity forbidden Rydberg states have been measured using two-photon laser spectroscopy techniques. Broadening and shift rates for the 6sns ¹S₀ (10 < n < 19) and 6snd ¹D₂ (8 < n < 26) levels due to thermal collisional interactions with Xe, Kr and Ar as perturber gases are plotted. Perturbations due to configuration interactions are discussed.     

OCS分子在128 nm附近的光解动力学研究：S(3PJ=2,1,0)、S(1D2)以及S(1S0)产物通道

本文利用时间切片离子成像技术对OCS分子进行了真空紫外波段的光解动力学研究. 在四个光解光波长(从129.32到126.08 nm)下测量了硫原子解离产物S(³P_J=2,1,0)、S(¹D₂)、S(¹S₀)的速度影像,并从中清晰地发现了四个主要的解离产物通道：S(³P_J=2,1,0)+CO(X¹Σ⁺),S(³P_J=2,1,0)+CO(A³π),S(¹D₂)+CO(X¹Σ⁺)和S(¹S₀)+CO(X¹Σ⁺). 在实验影像中,产物CO分子的部分振动态结构能够得到分辨. 实验还获取解离产物总平动能谱,产物分支比和角分布. 对实验结果进行分析显示除绝热解离通道S(³P_J=2,1,0)+CO(A³π)之外,在其他三个产物通道中非绝热效应都起到非常重要的作用.     

Relativistic calculations of 3s2 1S0-3s3p 1P1 and 3s2 1S0-3s3p 3P1,2 transition probabilities in the Mg isoelectronic sequence

Using the multi-configuration Dirac-Fock self-consistent field method and the relativistic configuration-interaction method,calculations of transition energies,oscillator strengths and rates are performed for the 3s 2 1 S 0-3s3p 1 P 1 spinallowed transition,3s 2 1 S 0-3s3p 3 P 1,2 intercombination and magnetic quadrupole transition in the Mg isoelectronic sequence(Mg I,Al II,Si III,P IV and S V).Electron correlations are treated adequately,including intravalence electron correlations.The influence of the Breit interaction on oscillator strengths and transition energies are investigated.Quantum electrodynamics corrections are added as corrections.The calculation results are found to be in good agreement with the experimental data and other theoretical calculations.     

The forgotten 1D2 level of charmonium

The standard “charmonium” picture predicts four C=+1 states (³P₀, ³P₁, ³P₂, 2 ¹S₀) between ψ and ψ′. If these are identified with the four experimentally observed levels, serious difficulties arise. We remark that a ,,forgotten” ¹D₂ level (J^PC=2^?) is likely to be around 3.5 GeV. It may be identified with χ(2.45) or χ(3.50), avoiding the above above difficulties. The 2 ¹S₀ level has then yet to be discovered.     

Faddeev πNN dynamics with ρ-exchange contribution for the 1D2 and 3F3 diproton anomalies

The ¹D₂ and ³F₃ diproton anomalies are studied in a framework of Faddeev πNN dynamics with ρ-exchange contribution. Two-body interactions in πN-P₃₃, πN-P₁₁, NN-³P₂; and NN-³Si₁ states are input. The pp-pp, pp-πd and πd-πd processes are treated in a unified way and the results are compared with partial wave analysis results of each process. The ¹D₂ and ³F₃ diproton anomalies are qualitatively explained by the present models. The ρ-contributions are remarkable in the amplitudes of pp-pp and pp-πd processes from the pp-¹D₂ state.     

Pressure broadening studies on the 33D1-2 3P0 helium line by saturated-absorption techniques

Broadening and shift measurements on the 3³D₁?2³P₀ component of the helium line at λ=587.5 nm are reported. The saturated-absorption method is used. Measurements are performed at room temperature and at liquid nitrogen temperature. Homogeneous broadening constants are deduced from an analysis taking into account the effect of weak velocity-changing collisions. Broadening and shift constants are interpreted in term of a Lennard-Jones interaction potential. The very small shifts observed show the predominance of the repulsive core effect in the interaction potential.     

Facteur de lande du niveau 83S1 du mercure

The g_J factor of the 8³S₁ state of mercury has been measured with two different techniques. The obtained value is of the same order of magnitude as for the 7³S₁ state and larger than the Landé factor of the free electron.     

Pressure shifts of 1D2 Rydberg states of Mg I

Pressure shifts of the 3snd ¹D₂ Rydberg states to n = 23 have been measured for He, A and Xe and found to agree with previous results for ²P states of alkalis. Improved term values for the energy levels from n = 13 to 23 have been obtained.     

On the mass of the ss^- member of the 1^3D1 meson nonet

In the framework of Regge phenomenology and meson meson mixing, this paper estimates the mass of isoscalar state （ss^-） of the 1^3D1 meson nonet, and the results given by two different approaches are 1735.51 ± 59MeV and 1730.29 ±46.SMeV.     

The mass of the isodoublet of the 2^1S0 meson nonet revisited

In the qq quark model, the states π（1300）, η（1295） and η（1475） are assigned as the 2^1S0 meson nonet. The mass of the isodoublet remains interesting and needs further confirmation in experiments. This paper employs the phenomenological trajectory on the （N, M^2）-plot and meson meson mixing methods to calculate the mass of this state, the calculated results are 1341 MeV and 1311.58 ± 59 MeV respectively. These predictions can be compared with experiments in the future.[第一段]     

3S1态电子偶素3γ衰变的γ射线能谱测量

用具有时间选择功能的高纯锗γ能谱仪测量了³S₁态电子偶素3γ衰变放出的连续γ能谱的300—510keV能区。结果表明,在实验误差范围内与量子电动力学理论曲线一致。 关键词：     

对31S0介子九重态中ss成员的质量分析

利用雷吉轨迹理论和介子九重态质量混合公式两种方案，对3^１Ｓ_０介子九重态中同位旋标量态(主要是ss—成分)的质量给出预言，两种方案分别给出1853MeV和1849±1.2MeV.两种方案自洽的结果，将为实验上寻找该态的候选者提供帮助. 关键词： 雷吉轨迹 介子混合 同位旋标量态     

非对称核物质中质子和中子的1S0态超流性

利用Brueckner-Hartree-Fock和BCS理论方法，计算了非对称核物质中处于¹S₀态的质子和中子的对关联能隙，着重研究和讨论了能隙的同位旋依赖性和三体核力的影响.结果表明：随核物质的同位旋非对称度增大，中子¹S₀态超流相存在的密度范围逐渐缩小而且对关联能隙峰值稍有升高；质子¹S₀态超流相存在的密度范围迅速扩大而且对关联能隙峰值显著降低.三体核力对非对称核物质中¹S₀态中子超流性及其同位旋依赖性的影响相对较小，但对¹S₀态质子超流性具有重要影响，而且其效应随核子数密度增大而迅速增强.三体核力的主要作用是强烈地抑制了具有高非对称度的核物质中高密度区域的¹S₀态质子超流性，导致质子超流相存在的密度范围显著缩小. 关键词： 同位旋非对称核物质 质子和中子超流性 三体核力 BCS理论     

Superlong pulses of laser oscillation on the 6 1P1-5 1D2 transition of the barium atom

A possibility of CW laser oscillation on atomic transitions between a resonance energy level and a metastable one under conditions when lower laser states are deactivated by electron impacts has been theoretically shown. We determined the plasma parameters so that CW laser action on such transitions of Cu, Au, Ca and Ba atoms may be possible. Superlong laser pulses of 6 μs duration were obtained on the 6 ¹P₁-5 ¹D₂ transition of the barium atom.     

Sub-kilohertz optical linewidths of the 7F0 ↔ 5D0 transition in Y2O3:Eu3+

Homogeneous optical linewidths as small as 760 Hz (fwhm) have been observed in Y₂O₃:Eu³⁺ using delayed heterodyne photon echoes. Hyperfine and lifetime contributions to dephasing are estimated to contribute ? 300 Hz to this width, and the remainder is attributed to quasi-resonant energy transfer.     

Experimental generalized oscillator strengths of the 61S0→61P1-excitation of barium

Experimental generalized oscillator strengths f(K²) for excitations of the 6¹P₁ state of Ba, measured at 200 eV and 300 eV, are compared with theoretical data obtained by Kim and Bagus. Theoretical and experimental data agree at K² < 0.3 a.u., but differ significantly at greater K².