衰变π介子谱学：一种新方法
Decay pion spectroscopy: a new approach
摘要：
我们提出了一个新的实验在电子和质子束设施的轻超核衰变π介子光谱，使用反冲距离技术分离产生的超核和磁谱仪的衰变π介子动量的精确测量。低压MWPC被提倡用于低能反冲探测，因为它们提供位置和时间信息，并且对伽马射线和电子背景高度不敏感。利用~5 MeV的α粒子研究了这种反冲探测器的位置和时间特性。通过使用目前提出的方法，与最近在美因茨的MAMI电子加速器进行的实验相比，检测到的超核的速率可以增加一到两个数量级。本文还讨论了用质子束实现高亮度衰变π介子谱实验的可能性。
英文摘要：
We propose a new experiment for decay pion spectroscopy of light hypernuclei at electron- and proton-beam facilities, using the recoil distance technique for separation of produced hypernuclei and a magnetic spectrometer for precise measurement of the decay pion momentum. Low-pressure MWPCs are advocated for low-energy recoil detection as they provide position and time information and are highly insensitive to gamma-ray and electron background. The position and timing characteristics of such a recoil detector were studied using ~5 MeV α-particles. By using the present proposed approach the rate of the detected hypernuclei can be increased by one-to-two orders of magnitude compared to a recent experiment carried out at the MAMI electron accelerator in Mainz. The possibility of realizing a high luminosity decay pion spectroscopy experiment with proton beams is also discussed.
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