Nuclear Matter Density Dependences of Non-Nucleonic Degrees of Freedom

我们建立了不稳定原子核的产生技术，发展了自旋控制技术，确定了不稳定原子核的磁矩和四极矩，确定了相互作用截面，最后确定了镜像衰变中弱核子流的诱导张量项和轴向电荷。从这些结果可以总结出以下几点：1系统地研究了高能重离子碰撞中抛射破碎过程产生的^< 8,12 >B、^9C、^< 12,16 >N、^< 13,19 >O、^< 20,21 >F、^<23>Mg、^<27>Si、^<35>Ar和^<39>Ca的自旋极化。这些研究阐明了重离子碰撞中的极化机制，有助于建立放射性核束极化技术我们测定了^< 12,16 >N, ^< 13,19 >O, ^<21>F, ^<27>Si, ^<39>Ca和^<41>Sc的电四极矩，并得到了这些核的核子密度分布信息。通过KKR方法框架下的电子能带结构计算，给出了研究所需的电场梯度（EFG）。tio_2晶体中的EFGs已通过富Ti中^<17>O的FT-NMR实验确定。通过对极富质子的^9C和^<13>O的磁矩的精确测量，发现^9C中有异常大的自旋期望值。这可能表明原子核中g因子的重要重整化，这与夸克约束机制有关精确测量了^8B、^<12>N、^9C、^<13>O和^<17>Ne的相互作用截面和碎片动量分布。根据这些实验数据，确定了这些原子核中的核子密度分布开发了一种新的自旋控制技术，并精确测量了质量为A = 12个镜面衰变（^<12>B和^<12>N）的核对准项。通过测量，确定了g宇称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异常大的轴向电荷，这是核子质量重正态化（核子质量猝灭）的可靠证据。少

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