共查询到20条相似文献,搜索用时 15 毫秒
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P.González 《中国物理C(英文版)》2009,33(12)
Constituent quark models based on two-body potentials systematically overpredict the mass of △_(D_(35))(1930). A possible solution to this problem comes out from the application of a schematic hybrid model, containing three-quark as well as meson-baryon components, to the light-quark baryon spectrum. The △_(D_(35))(1930) and its partners △_(D_(33))(1940) and △_(S_(31)) (1900) are found to contain a significant ρ△ component. Then, through the use of the hidden gauge formalism, it is shown that these resonances can be dynamically generated from the ρ-△ interaction. In particular △_(D_(35))(1930) can be interpreted as being essentially a ρ△ bound state. This interpretation suggests that the inclusion of ρ△ as an effective inelastic channel in data analyses could improve the extraction and identification of the resonance. 相似文献
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We have discussed the single particle energies and wave functions of a boundisobar in O16 by using the O16 equation. 相似文献
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DONG Yu-Bing LIU Jian 《理论物理通讯》2004,(7)
Point form relativistic dynamics of relativistic quantum mechanics is employed to estimate the photon and electroproduction amplitudes of △(1232) resonance. Results are compared with the non-relativistic work, and the differences between the two frame works are discussed. 相似文献
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利用手征有效场论, 通过对核物质中核子传播子的修正, 研究了核物质中的△(1 232)粒子的有效质量和衰变宽度。 发现△(1 232)粒子的有效质量随核物质密度的增加而减小, 而衰变宽度随核物质密度的增加而增加; △(1 232)粒子衰变宽度的变化主要取决于核子有效质量以及△(1 232)粒子有效质量的变化。 Based on the chiral effective field theory (CHEFT), we study the effective mass and decay width of △(1 232) in the nuclear matter with the modified nucleon propagator. We find that the effective mass of △(1 232) decreases, while the decay width of △(1 232) increases with increasing the density of nuclear matter. And the decay width of △(1 232) mainly depends on the effective masses of nucleon and △(1 232) 相似文献
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我们把核子与△的相互作用取为单玻色交换力,耦合常数通过层子模型来确定.如果假定核子的波函数与不存在△的情况相同,则可以近似求到核子激发态△在核内的平均场.得到的定性结果是△的平均场比核子的平均场浅~15MeV. 相似文献
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The one boson exchange nuclear force is applied to the discussion of the nucleon-△ interaction. The coupling constant is determined by the straton model. Assuming that the wave function is unaltered by the presence of △, we are able to obtain the average field of the isobar in the nuclei approximately. The qualitative feature obtained is that the average field of △ is shallower then that of nueleon by an amount of~15 MeV. 相似文献
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一、棱镜分光的特点一般的分光镜都是在45°入射角的条件下使用的,其目的是想得到反射光与透射光互相垂直的两束光。为了实现这种分光,可采用两种形式:一是平板分光,一是棱镜分光,如图1所示。 相似文献
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随着光学技术的发展,越来越需要广泛地采用高精度棱镜,这就给棱镜加工工艺提出了更高的要求。而现在,许多工厂对高精度棱镜的90°角大都采用“长方体”加工,但“长方体”不能解决棱镜任意角和同时解决两种光学平行差的精度要求。“棱镜体”就是将“长方体”加工棱镜90°角的原理推广到加工任意角棱镜的一种光学工具。 相似文献
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棱镜-薄膜耦合结构是单侧镀电介质膜的双棱镜结构中的一种,在光信号传输方面具有十分重要的作用.利用稳态相位法分析了这种结构中反射和透射光束的Goos-Hanchen位移,研究结果表明,反射和透射光束的Goos-Hanchen位移随薄膜厚度或入射角的增大除出现共振峰外,还存在反射光束的Goos-Hanchen位移共振峰为负值的新现象.在共振点处透射和反射光束的正向或负向位移量最大可达百余波长.这一结构中薄膜和入射角.对光束Goos-Hanchen位移的调制在设计新型光位移调制和光传感器件中具有潜在的应用. 相似文献
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本工作的主要目的是研究中能(γ,p)反应的机制。在微分截面的计算中,同时考虑了直接反应过程及Δ-isobar-空穴态的激发。结果指出,简单的PWIA计算不能符合实验数据,而Δ-h模型却能给出合理的结果,这表明isobar的中间激发在(γ,p)反应中的作用是很明显的。文中还对所得结果做了一些讨论。 相似文献
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本工作用Hartree-Fock方法研究了核子共振态Δ(1232)在_Δ~4He、_Δ~(12)C和_ΔO系统中能否被束缚的问题。核子-核子与核子-Δ粒子之间的相互作用势均采用单玻色子交换势。计算结果表明,Δ粒子只在_Δ~4He系统中可被束缚,在_Δ~(12)C和_Δ~(16)O系统中均不被束缚。 相似文献