Nuclear Magnetic Resonance on Short-Lived Nuclei Polarized by Means of Tilted Foil Technique

为了研究短寿命的核磁矩，发展了一种新的核磁共振技术，在该技术中探测到了不对称的β衰变。由于其强大的技术，即通过核反应产生极化发射体的高效率，通过不对称的β衰变获得高的核磁共振检测效率，在材料中深度注入杂质，不限制宿主材料与杂质的结合，最终稀释杂质的密度，这种核磁共振方法可以成为固体物理和核物理中其他研究的有效工具。为了使目前的核磁共振技术适用于质量数为40的短寿命核。对于很难通过核反应极化的60，已经发展了一种新的技术，即通过束-倾斜-箔相互作用产生核极化。这一点已成功地融入到核磁共振技术中。使用了碳箔和/或Mylor。与其他情况相比，被抛出动能离子的箔表面的金金属被证明是适合于离子的，因为离子上附着的电子更多。通过使用~lt；^(12)B&gt；、~lt；^(8Li&>t；)和~lt；^(39)Ca&gt；核，扩展了本核磁共振系统的适用范围。

A new nuclear-magnetic-resonance (NMR) technique in which the asymmetric <beta> decay is detected has been developed for the studies of nuclear magnetic moments of short-lived <beta> -emmiting nuclei. Because of its powerful technique, i.e. high production efficiency of polarized <beta> -emitter through nuclear reaction, high detection efficiency of NMR by means of asymmetric <beta> decay, deep implantation of the impurity in materials, no limitation in the combination between host materials and impurity, and finally dilute density of the impurity, this NMR method can be an efficient tool for other studies in solid state physics, and nuclear physics.In order to make the present NMR technique applicable to short-lived nuclei in the mass number 40<A<60, that have been difficult to polarize through nuclear reaction, a new technique, i.e. the creation of nuclear polarization by means beam-tilted-foil interaction, has been developed. This has been incorporated in the NMR technique successfully. Foils of carbon and/or mylor were used. Gold metal on the surface of the foil from where kinetic ions were ejected were shown to be suitable for the ions, since more electrons were attached on the ions compared with other cases. The present NMR system was shown to be expanded in its applicability by use of <^(12)B> , <^8Li> , and <^(39)Ca> nuclei.