Charge Symmetry Breaking in Light Hypernuclei
Charge Symmetry Breaking in Light Hypernuclei
复制标题
轻超核中的电荷对称性破缺
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Achenbach
中科院分区：
文献类型：
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作者：
P. Achenbach
最近，人们用新的技术，特别是新一代的磁谱仪，精确地确定了轻超核中的Λ-超子基态结合能。$${\varLambda }$$Λ超核等多重态的精细谱学结果对强相互作用中电荷对称性破缺的研究有重要贡献。在美因茨微波加速器MAMI上，利用奇异电产生中衰变π介子的高分辨光谱，提取了Λ 4 H的基态结合能。这个值与同位旋镜超核的值进行了比较，以确认电荷对称性的相当大的破缺。在$$A = 7，8，9，$$A = 7，8，9和10超核的值的概要表明在其他isomultiplets小或消失的影响。对$$A = 4$$A=4镜对中的大的和自旋相关的效应的充分理解仍然是超核物理的开放问题之一。
Recently precise $${\varLambda }$$Λ-hyperon ground-state binding energies in light hypernuclei have been determined with novel techniques, in particular with a new generation of magnetic spectrometers. The precision spectroscopy results of $${\varLambda }$$Λ hypernuclei isomultiplets contributed considerably to the study of charge symmetry breaking in the strong interaction. At the Mainz Microtron MAMI the high-resolution spectroscopy of decay-pions in strangeness electro-production was used to extract the ground state binding energy in $$^4_{\varLambda }$$Λ4H. This value was compared to the value of the isospin mirror hypernucleus $$^4_{\varLambda }$$Λ4He to confirm a sizable breaking of the charge symmetry. A synopsis for the values in the $$A = 7, 8, 9,$$A=7,8,9, and 10 hypernuclei suggests small or vanishing effects in other isomultiplets. The full understanding of the large and spin-dependent effect in the $$A = 4$$A=4 mirror pair remains one of the open issues of hypernuclear physics.