用潘宁阱装置测量中微子质量本征态的可行性研究

The massive neutrinos are proposed to explain the neutrino oscillation phenomenon. Although the direct evidences for neutrino flavor transformation have been observed and confirmed definitely, the massive states of neutrino are still hidden behind the flavor states of neutrino except playing a back role in neutrino oscillation. This program proposes a new approach to study the massive states of neutrino based on the two-body decay of nucleus, which recoiled momentum is measured in high precision for observing the massive states of neutrino. There are two objectives: one is the feasibility of measuring the recoiled momentum of decayed nucleus with required high precision in Penning trap from theoretical study; the other is the test of image charge detection method, which is a key technique for the measurement of recoiled momentum in Penning trap.. The experiment program will use the Shanghai-EBIT equipment, which is a combination of the electron beam and the ion trap. The EBIT can be operated in the Penning trap mode when the electron beam is shut down, in which condition the image charge detection technique is investigated. This work will prove one goal of the “Supertrap” project in future.

为了解释中微子振荡现象，理论上提出了中微子质量本征态的概念，虽然实验上已经充分证实中微子的三种弱作用本征态之间可以相互转化，但是中微子的质量本征态一直被隐藏在弱作用本征态的背后，只是通过中微子振荡现象间接体现出它们的实在性。本项目提出一种研究中微子质量本征态的新方法，它是基于原子核的两体衰变，通过高精度测量衰变后的子核的反冲动量来直接观测中微子的质量本征态。研究目标有两个：一是从理论上研究在潘宁阱中测量核的反冲动量是否可以达到所需的精度；二是从实验上掌握镜像电荷的探测方法，为反冲动量的测量积累关键的技术。. 实验方面的研究计划将借助上海EBIT装置，它是将电子束与潘宁阱相结合的装置，关闭电子束后阱区就是一个潘宁阱，基于此开展镜像电荷的探测方法的研究。该工作将为今后“超级离子阱”的建设目标提供依据。