权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

新型核四极共振技术的建立（利用不对称β衰变）

基本信息

批准号：
08554005
负责人：
MINAMISONO Tadanori
金额：
$ 11.01万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08554005/
关键词：
β-NMR technique Nuclear Quadrupole Resonance Electric Quadrupole Moments Quadrupole Coupling Constant Electoric Field Gradient Nuclear Spin Polarization Short Lived Beta Emitting Nuclei β-Ray Angular Distribution 短寿命ベータの放射性核結晶中不純物超微細

项目摘要

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

我们将新的核四极共振技术（非对称β衰变）应用于实际，在自旋极化短寿命核的非对称β衰变（β-NMR）核磁共振技术中引入了对核自旋的人工操纵。(1)我们研制了多种相对较轻的β-NMR探针核。通过选择碎片的发射角，成功地对高能弹丸碎裂过程中的核自旋极化进行了研究，其中包括：12 π D1 B，19 π D1C，16 π D1 N，113 π D1 O，120，21 π D1 F，123 π D1 Mg，127 π D1 Si，135 π D1 Ar，139 π D1Ca。此外，我们还研究了低能核反应中的自旋极化机制，并确定了产生这些极化探针核的最佳条件。(2)我们把新的核四极共振技术投入实际应用。我们开发了高效的核四极杆， ...更多信息共振和人工操纵的核自旋，通过施加射频磁场的核磁共振频率分裂下的四极相互作用。为了实现这一技术，我们介绍了通过真空电容器的开关的高速调谐系统。我们将此技术应用于D112涡轮增压器D1 B（核自旋I = 1），N-甲基D123 N-甲基D1 Mg，N-甲基D135 N-甲基D1 Ar，N-甲基D139 N-甲基D1Ca（I = 3/2），N-甲基D18 N-甲基D1 B，N-甲基D116 N-甲基D1 N（I = 2），N-甲基D119 N-甲基D1 O，N-甲基D121 N-甲基D1 F，N-甲基D127 N-甲基D1 Si（I = 5/2），和D141-D1 Sc（I = 7/2）。(3)阐明了晶体内部的电场梯度和电子结构。比较实验电场梯度和电子能带结构的第一原理计算，我们发现的重要性的杂质和局部晶格弛豫的电荷状态。(4)由此发展起来的核自旋操纵技术被应用于核自旋极化和排列的相互转换。我们成功地制作了β射线角分布中的核自旋排列，并精确地观测到了β射线角分布中的排列关联项。少