氦7 λ超核的（e，e 'K+）反应观察
Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction
摘要：
在Jefferson实验室C厅进行了一项新研制的高分辨率K介子谱仪（HKS）和一种新结构的散射电子谱仪的实验。利用（e，e 'K+）反应首次观测到了丰中子超核He 7 λ的基态，能量分辨率为~0.6 MeV.这个分辨率是迄今为止超核反应光谱学报道的最好的分辨率。He 7 Lambda结合能补充了A=7，T=1超核等三重态的最后一个缺失信息，为ΛN势的电荷对称性破缺（CSB）效应提供了新的输入。
英文摘要：
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich hypernucleus, He 7 Lambda, was observed for the first time with the (e,e'K+) reaction with an energy resolution of ~0.6 MeV. This resolution is the best reported to date for hypernuclear reaction spectroscopy. The he 7 Lambda binding energy supplies the last missing information of the A=7, T=1 hypernuclear iso-triplet, providing a new input for the charge symmetry breaking (CSB) effect of ΛN potential.
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