基于HIAF SRing的并束实验设计及研究
Design and Research of Merging Experiment Based on HIAF SRing
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摘要: 超重核的真空衰变对于验证量子电动力学至关重要，由于过去的固定靶实验中，核外电子干扰正负电子对的测量，国际上尚未观测到该现象。提出基于HIAF SRing的并束实验方案，通过238U92+在自由空间碰撞，排除了核外电子的影响。根据亮度理论，结合对交叉角度、Laslett频移和束束相互作用的分析，优化得到1.9×1024 cm-2s-1的峰值亮度，基本满足了实验需求。
Vacuum decay phenomenon of superheavy nucleus is a problem of fundamental interest to verify quantum electrodynamics. As the shell electrons interfere the detection of electron-positron pairs in the fixed target experiments in the past, it's still not corroborated. A new merging experiment scheme is proposed in this paper. The interference of shell electrons is eliminated by collisions of 238U92+ in free space. According to the luminosity theory and the analyses of crossing angle, Laslett tune shift and beam-beam interaction, an optimized peak luminosity of 1.9×1024 cm -2·s -1 is achieved. It meets the requirements of merging experiment essentially.Abstract: Vacuum decay phenomenon of superheavy nucleus is a problem of fundamental interest to verify quantum electrodynamics. As the shell electrons interfere the detection of electron-positron pairs in the fixed target experiments in the past, it's still not corroborated. A new merging experiment scheme is proposed in this paper. The interference of shell electrons is eliminated by collisions of 238U92+ in free space. According to the luminosity theory and the analyses of crossing angle, Laslett tune shift and beam-beam interaction, an optimized peak luminosity of 1.9×1024 cm -2·s -1 is achieved. It meets the requirements of merging experiment essentially.
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