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 elcctron-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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