Establishment of the New Nuclear Quadrupole Resonance Technique (by Means of Asymmetric β Decay)

我们put the new nuclear quadrupole resonance technique (by means of asymmetric β decay) to practicaluse,introducing artificial manipulation of the nuclear spin into the nuclear magnetic resonance技术由asymmetric means β decay (β-NMR) on the spin polarized short lived nuclei.(1) Wedeveloped many kinds of relatively light β-NMR probe nuclei. The nuclear spins of i D18,12 -NMR probe nucleiD19 D1C, D112,16 D1N, D113 D1O, D120,21 D1F, D123 D1Mg, D127 D1Si, D135 D1Ar，D1Ca, were successfully polarized in high energy projectile fragmentation process，by selecting emission angle of the fragments. In addition，我们investigated the nuclear spin polarization mechanism of D120 D1F， D119 D1O, D18 D1LiD1N in低能量核反应，and determined the optimum condition of the production of these polarized probe nuclei.(2)我们putthe new nuclear quadrupole resonance技术nique to practical use. We developed the highly efficientnuclear quadrupole r…More esonance and the artificial manipulation of nuclear spin，by applying rf magnetic fields on the NMR resonance frequencies split under the quadrupoleinteraction. To realize this technique，我们引入了high speed tuning system by the switching of the vacuum capacitors.我们应用this technique to the D112 D1B (nuclear spin I = 1), D123 D1Mg, D135 D1ArI D139 I D1Ca (I = 3/2), I D18 I D1B, I D116 I D1N (I = 2), I D119 I D1O, I D121 I D1FD127 D1Si （I = 5/2）D1Sc (I = 7/2).(3) We elucidated the electric field gradients and the electronicstructures inside crystals. Comparing experimental electric field gradients and the first principlecalculations of the electron band结构we found the importance of the charge state of the impurities and local lattice relaxation.(4) Thus开发nuclear spin manipulation technique was applied to the mutual conversion between nuclearspin polarization and alignment我们succeeded in the production of nuclear spin alignment inD18, D1B, D120, D1F, D141, D1Scand observed the alignment correlation terms in β ray angular distributions precisely. Less

We put the new nuclear quadrupole resonance technique (by means of asymmetric β decay) to practical use, introducing artificial manipulation of the nuclear spin into the nuclear magnetic resonance technique by means of asymmetric β decay (β-NMR) on the spin polarized short lived nuclei.(1) We developed many kinds of relatively light β-NMR probe nuclei. The nuclear spins of ィイD18,12ィエD1B, ィイD19ィエD1C, ィイD112,16ィエD1N, ィイD113ィエD1O, ィイD120,21ィエD1F, ィイD123ィエD1Mg, ィイD127ィエD1Si, ィイD135ィエD1Ar, ィイD139ィエD1Ca, were successfully polarized in high energy projectile fragmentation process, by selecting emission angle of the fragments. In addition, we investigated the nuclear spin polarization mechanism of ィイD120ィエD1F, ィイD119ィエD1O, ィイD18ィエD1Li, ィイD116ィエD1N in low energy nuclear reactions, and determined the optimum condition of the production of these polarized probe nuclei.(2) We put the new nuclear quadrupole resonance technique to practical use. We developed the highly efficient nuclear quadrupole r … More esonance and the artificial manipulation of nuclear spin, by applying rf magnetic fields on the NMR resonance frequencies split under the quadrupole interaction. To realize this technique, we introduced the high speed tuning system by the switching of the vacuum capacitors. We applied this technique to the ィイD112ィエD1B (nuclear spin I = 1), ィイD123ィエD1Mg, ィイD135ィエD1Ar, ィイD139ィエD1Ca (I = 3/2), ィイD18ィエD1B, ィイD116ィエD1N (I = 2), ィイD119ィエD1O, ィイD121ィエD1F, ィイD127ィエD1Si (I = 5/2), and ィイD141ィエD1Sc (I = 7/2).(3) We elucidated the electric field gradients and the electronic structures inside crystals. Comparing experimental electric field gradients and the first principle calculations of the electron band structure, we found the importance of the charge state of the impurities and local lattice relaxation.(4) Thus developed nuclear spin manipulation technique was applied to the mutual conversion between nuclear spin polarization and alignment. We succeeded in the production of nuclear spin alignment in ィイD18ィエD1B, ィイD120ィエD1F, and ィイD141ィエD1Sc, and observed the alignment correlation terms in β-ray angular distributions precisely. Less