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结合量子方法研究光子在单缝和多缝中的衍射.首先利用光子满足的薛定谔方程得出光子在屏上光强表达式,然后通过基尔霍夫公式得出光强与缝宽、缝长、缝厚和光波长的定量关系.与实验和经典理论的对比结果表明,它们之间相互吻合很好. 相似文献
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The recoil distance Doppler shift method has been widely used in the study of nuclear structure to determine the level lifetime and absolute transition probabilities.A capacitance servo control plunger based on this method has been successfully developed by the Nuclear Structure Group of the China Institute of Atomic Energy.Three microscopes were employed to check the parallelism and can therefore guarantee a delicate measurement of the distance between the target and the stopper.This new plunger made a successful performance in the test experiment and the measured lifetime of the 2~+→0~+ transition in ~(78)Kr is in agreement with the previous value. 相似文献
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High spin states of the odd-A 87Sr were populated by the fusion-evaporation reaction 82Se(9Be, 4n) 87Sr at a beam energy of 46 MeV. Excited levels of 87Sr have been extended up to an excitation energy of 7.4 MeV at spin 31/2ħ. The coupling of a g9/2 neutron hole to the yrast states of the 88Sr core can account for the low-lying states in 87Sr. The structure of the higher spin states is discussed by analogy with those of the neighboring odd-A N=49 isotones and possible configurations are proposed. 相似文献
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长期以来人们一直致力于折射率空间变化光子晶体的研究,对折射率随时间变化的光子晶体缺少应有的重视。本文建立折射率阶跃型时变光子晶体模型。借助时空对比的方法,基于麦克斯韦方程组和周期结构的布洛赫原理对该时变光子晶体的传输矩阵计算公式进行了推导,并给出计算实例,得到空间频率透射谱和色散关系形成的能带结构。本文为时变光子晶体的研究提供了一种基本方法。 相似文献
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The level structures of 93 Mo are investigated using Large Scale Shell Model calculations,and reasonable agreement is obtained between the experimental and calculated values.The calculated results show that the lower-lying states are mainly dominated by proton excitations from the If5/2,2 p3/2,and 2 p1/2 orbitals into the higher orbitals across the Z=38 or Z=40 subshell closure.For the higher-spin states,multi-particle excitations,including the excitation of 2 d5/2 neutrons across the N=56 subshell closure into the high-j intruder 1 h11/2 orbital,are essential.Moreover,the previously unknown spin-parity assignments of the six higher excited states in 93 Mo are inferred from the shell model calculations. 相似文献
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