用于短寿命核基态四极矩测量的快速开关NMR系统
Fast switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei
摘要：
为了测量稀有快同位素束流产生的短寿命核的基态电四极矩，在NSCL/MSU研制了一套β射线探测核四极矩共振系统。该系统能够在宽范围内快速和顺序地应用多个过渡频率。谐振电路中的可变电容器之间的快速切换确保了在β射线检测核磁共振技术中向线圈提供足够的功率。快速切换技术提高了共振信号的检测效率，并且在感兴趣的核的极化和/或产生速率小时以及在核自旋大时特别有用。
英文摘要：
A beta-ray detecting nuclear quadrupole resonance system has been developed at NSCL/MSU to measure ground-state electric quadrupole moments of short-lived nuclei produced as fast rare isotope beams. This system enables quick and sequential application of multiple transition frequencies over a wide range. Fast switching between variable capacitors in resonance circuits ensures sufficient power delivery to the coil in the beta-ray detecting nuclear magnetic resonance technique. The fast switching technique enhances detection efficiency of resonance signals and is especially useful when the polarization and/or production rate of the nucleus of interest are small and when the nuclear spin is large.
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