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本文尝试性地建立了APC(αβ)3内内层部分具有C3群对称特性的三个β发色团之间的“三聚体”激子相互作用的模型,依据“三聚体”激子相互作用的光谱表征,通过对APC(αβ)3的吸收光谱和CD谱的解叠,分析和计算得到APC(αβ)3内β发色团之间的距离,以及在坐标中的相对位置,估算了激发能在三个激子态之间的去局域时间. 相似文献
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本文讨论了宇宙处于高维相时无质量标量粒子气的非热分布、能密度以及增加的熵。从迅变阶段粒子数分布不变的假定出发,在初始温度β0-11/2α20-1的近似下,计算得高维相结束时的总熵与初始总嫡之比Sf/S0与T0α20/Tfα2f同量级。Sf,T
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D. V. Amelin Yu. G. Gavrilov Yu. P. Gouz V. A. Dorofeev R. I. Dzhelyadin A. M. Zaitsev A. V. Zenin A. V. Ivashin I. A. Kachaev V. V. Kabachenko A. N. Karyukhin A. N. Konoplyannikov V. F. Konstantinov V. V. Kostyukhin V. D. Matveev V. I. Nikolaenko A. P. Ostankov B. F. Polyakov D. I. Ryabchikov A. A. Solodkov A. V. Solodkov O. V. Solovianov E. A. Starchenko A. B. Fenyuk Yu. A. Khokhlov 《Physics of Atomic Nuclei》2005,68(3):359-371
Experimental investigations of candidates for hybrid mesons in the VES experiment at the Institute for High Energy Physics (Protvino) are surveyed. The data in question concern π 1 (1400) characterized by the exotic quantum numbers of J PC = 1?+ and observed in the ηπ ? final state; JPC = 1?+ π 1 (1600) in the ηπ ?, b 1 (1235)π, and f 1(1285)π ? final states; and J PC = 0?+ π(1800) in the f 0(980)π ?, f 0(1300)π ?, f 0(1500)π ?, and a 0 ? (980)η final states. New results are given along with data published previously. 相似文献
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本工作较为详细地测定了静电场作用下α-碘酸锂的电流弛豫行为:在撤去c轴方向上的静电场后,从我们所用测量电流仪器的响应时间到某一tk的区间内,放电电流服从(t/t0)-α的负幂次方律;而在t>t_k,其规律近似地为:(t/t0)(-α′ln(t/t0))。相关的弛豫参数α,α′和tk在有限的范围内,依赖于温度和施加电压的大小,也因样品不同而有差异。对将近十个样品进行了测试,结果表明,大多数晶体在尽可能小的电压下0.43≤α≤0.7,0.07<α′<0.09;上述的电流弛豫表达式与α-碘酸锂在偏压场作用下观察到的其它物理现象的弛豫行为,与在中子衍射加强和表观介电常数中的表现如出一辙;可以初步肯定各种现象的弛豫行为具有相同的物理根源。
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ISLAM S. M. SAIFUL MINORU HANAYA MASAMOTO IWAIZUMI MASANOBU WAKASA KUNIO MOCHIDA MASAHIRO MUKAI 《Molecular physics》2013,111(14):1183-1192
Sublevel properties of the lowest excited triplet (T1) nπ* states of α-silyl and α-germyl ketones were examined by means of ODMR, time-resolved EPR and optical spectroscopy. The EPR parameters, D, E and g, population ratios, and triplet lifetimes were obtained. The D value and the triplet lifetime varied among the molecules. In contrast the E value and population ratio remains nearly the same. These properties together with their solvent dependence and emission properties are interpreted in terms of spin-orbit couplings between T1 (nπ*) and higher S1 (nπ*), T2 (ππ*) and S2 (ππ*) states. An origin of the remarkable red-shifts of 1,3 (π*) are discussed based on a model of delocalized n, π and π* electrons over the Si and Ge atoms. This model is also consistent with all the triplet properties obtained. 相似文献
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N. G. Antoniou 《Zeitschrift für Physik A Hadrons and Nuclei》1969,223(5):441-446
A finite energy sum rule for theπ-π scattering suggests that theρ-trajectory chooses nonsense at the point αρ=0, and that the spin of theg(1650) meson isJ p =1?. 相似文献
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Motivated by the recent lattice QCD results indicating that the topological charge contribution to the flavor singlet axial vector current can be traded off by the constituent quark masses, we investigate the radiative decays of pseudoscalar (π,K, η, η′), vector (ρ,K*, ω, ?) and axial vector (A 1) mesons using a simple relativistic constituent quark model. For both simplicity and relativity, we take advantage of the distinguished features in the light-cone quantization method: (1) the Fock-state expansion of meson wavefunctions are not contaminated by the vacuum fluctuation, (2) the assignment of meson quantum numbers are given by the Melosh transformation. Except the well-known constituent quark masses of (u,d,s) quarks and the spin-averaged meson masses, the only parameter in the model is the gaussian parameter β which determines the broadness (or sharpness) of radial wavefunction. The computed decay widths and the transition form factors of ρ, ω → π(η)γ*,K* →Kγ* andA 1 → πγ* at 0≤Q 2≤5 GeV2 and π0(η) → γ*γ at 0≤Q 2≤3 GeV2 are in a remarkably good agreement with the experimental data and the result forA 1 + → π+ γ* transition is quite consistent with the experiments of pion scattering on a nucleus using Primakoff effect. This model is potentially useful in the cocktail analyses of the dilepton productions in proton-proton, proton-nucleus and nucleus-nucleus collisions at SPS energies and a little above. 相似文献
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In this article,we calculate the contribution from the nonfactorizable soft hadronic matrix element to the decay B~0→χc1~π~0 with the light-cone quantum chromo-dynamic(QCD) sum rules.The numerical results show that its contribution is rather large and should not be neglected.The total amplitudes lead to a branching fraction which is in agreement with the experimental data marginally. 相似文献
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Relativistic multichannel treatment of autoionization Rydberg series of 4s^2nf(n=4- 23)J^π -(7/2)° for scandium 下载免费PDF全文
Based on relativistic multichannel theory, this paper calculates the energy levels of autoionization Rydberg series 4s^2nf(n=4- 23)J^π -(7/2)° of scandium at different levels of approximation within the framework of multichannel quantum defect theory. The present results show that the dipole polarizations play an important role. Considering the dynamical dipole polarization effects, this paper finds that the difference between calculated and experimental quantum defects for the 4s^2nf(n=4- 23)J^π -(7/2)° series is generally about 0.01- 0.03. Furthermore, the reason that 4s^216f is obscured in experimental spectra is suggested to be the interaction with the neighbouring resonance state converged to 3d^2(^1G4) of Sc^+. 相似文献
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The Ericson-Ericson optical potential for theπ-nucleuss-wave interaction was extended to be applicable also for light nuclei. In particular, terms of order A?1 were evaluated and the (π2N) dispersion was considered. From comparison with experimental data we found that considerable improvement could be achieved by introducing terms of order A?1. The (π2N) dispersion was found to be repulsive and of the same magnitude as the absorption. The (πN) scattering lengths were deduced to be α3?α1=0.258±0.008m π ?1 and α1+2α3=?0.018±0.008m π ?1 . 相似文献
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