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Nuclear Matter Density Dependences of Non-Nucleonic Degrees of Freedom

非核自由度的核物质密度依赖性

基本信息

批准号：
09304032
负责人：
MINAMISONO Tadanori
金额：
$ 25.15万
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：
1997
资助国家：
日本
起止时间：
1997 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09304032/
关键词：
Non-Nucleonic Degrees of Freedom Induced Tensor Term of Weak Nucleon Current Axial Charge Nucleon Density Distribution Nuclear Moments β-NMR technique β-Ray Angular Distribution Unstable Nuclei 擬ベクトル流の時間成分短寿命ベータ放射性核

项目摘要

We established the technique of the production of unstable nuclei, developed the spin control technique, determined the magnetic moments and the quadrupole moments of unstable nuclei, the interaction cross-sections, and finally determined the induced tensor term and the axial charge in the weak nucleon currents in the mirror beta decays. From these results,of the present stydy can be summarized as follows.1 Nuclear spin polarizations of ^<8, 12>B, ^9C, ^<12, 16>N, ^<13, 19>O, ^<20, 21>F, ^<23>Mg, ^<27>Si, ^<35>Ar and ^<39>Ca produced through the projectile fragmentation process in hegh energy heavy ion collisions have been studied systematically. These studies made clear the polarization mechanism in heavy ion collisions and helped us to establish the polarized radioactive nuclear beam techniques.2 We have determined the electric quadrupole moments of ^<12, 16>N, ^<13, 19>O, ^<21>F, ^<27>Si, ^<39>Ca and ^<41>Sc, and got information on the nucleon density distributions in these nuclei. … More The electric field gradients (EFG) necessary for the studies have been given through electron band structure calculations in the framework of the KKR method. EFGs in the TiO_2crystal have been determined experimentally from the FT-NMR of the nuclei such as ^<17>O in the enriched Ti^<17>O_2.3 Abnormally large spin expectation value in ^9C has been found, from the precise measurement of the magnetic moments of the extremely proton-rich nuclei ^9C and ^<13>O. This may suggest the signigicant renormalization of the g-factors in the nucleus, which is connected with the quark confinement mechanism.4 Interaction cross-sections and the fragment momentum distributions of ^8B, ^<12>N, ^9C, ^<13>O and ^<17>Ne have been precisely measured. From these experimental data, nucleon density distributions in these nuclei were determined.5 A new technique of spin control has been developed, and the nuclear alignment terms have been precisely measured for mass A = 12 mirror beta decays )^<12>B and ^<12>N). From the measurement, precise upper limit of the G-parity irregular induced tensor term was determined. The same data revealed the abnormally large axial charge in the weak nucleon currents, which is the reliable evidence of the renormalization of the nucleon mass (quenching of the nucleon mass) in the nucleus. Less

我们建立了不稳定核的产生技术，发展了自旋控制技术，确定了不稳定核的磁矩和四极矩以及相互作用截面，最后确定了镜像β衰变中弱核子电流中的诱导张量项和轴向电荷。1.系统地研究了高能重离子碰撞中入射碎裂过程中产生的^&lt；8，12&gt；B，^9C，^&lt；12，16&gt；N，^&lt；13，19&gt；O，^&lt；20，21&gt；F，^&lt；23&gt；Mg，^&lt；27&gt；Si，^&lt；35&gt；Ar和^&lt；39&gt；Ca的核自旋极化。这些研究阐明了重离子碰撞中的极化机制，并帮助我们建立了极化放射性核束技术。2我们测量了^&lt；12，16&gt；N，^&lt；13，19&gt；O，^&lt；21&gt；F，^&lt；27&gt；Si，^&lt；39&gt；Ca和^&lt；41&gt；Sc的电四极矩，得到了这些核中核子密度分布的信息。…在KKR方法的框架下，通过对电子能带结构的计算，给出了研究所需的电场梯度。通过对极富质子核^9C和^&lt；13&gt；O的磁矩的精确测量，发现了^9C中异常大的自旋期望值。这可能表明原子核中g因子的显著重整化，这与夸克禁闭机制有关。4.相互作用截面和碎片动量分布。N，^9C，^&lt；13；O和^&lt；17；Ne已被精确测量。根据这些实验数据，确定了这些核中的核子密度分布。5发展了一种新的自旋控制技术，并精确地测量了质量为A=12镜像β衰变(^&lt；12&gt；B和^&lt；12&gt；N)的核排列项。通过测量，确定了G奇偶不规则诱导张量项的精确上限。同样的数据揭示了弱核子电流中的反常大的轴向电荷，这是核子质量重整化(核子质量猝灭)的可靠证据。较少