Electromagnetic Moments of nuclei in the P and sd cross-shell region

P 和 sd 跨壳层区域中原子核的电磁矩

• 批准号: 09640340
• 负责人: ASAHI Koichiro
• 金额: $ 1.86万
• 依托单位: Tokyo Institute of technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640340/
• 关键词: neutron-rich nuclei; ^<18>N; nuclear magnetic moment; electric quadrupole moment; beta-NMR; projectile fragmentation reaction; spin-polarized radioactive beams; psd effective interactions; 核模型; psd有効相互作用; ベータ検出核磁気共鳴法; ベータ線非対称性; 殻模型; psd二体相互作用

The magnetic moment and electric quadrupole moment of a neutron-rich nucleus ^<18>N have been determined by the beta-NMR method, taking advantage of the fragment spin polarizationinduced in the intermediate-energy projectile fragmentation reaction. To assure the existence of a sufficient polarization prior to theresonance search, a scheme of polarization measurement by means of an adiabatic fleidrotation has been developed and successfully incorporated in the beta-NMR experiment. From the observed resonance in a Pt stopper the magnetic moment for the ^<18>N ground state has been determined to be |mu | = 0.3279 * 0.0013 mu_N. The ^<18>N fragments have also been implanted in a single crystal Mg stopper, and from the observed quadrupole frequency |eqQ/h| = 73.2 * 1.4 kHz, the electric quadrupole moment |Q| 12.3 * 1.2 mb has been deduced. The obtained mu and Q are compared with shell model calculations.

富中子核^ 18 N的磁矩和电四极矩已经通过β-NMR方法测定，利用了中能射弹碎裂反应中引起的碎片自旋极化。为了确保在共振搜索之前存在足够的偏振，开发了一种通过绝热旋转进行偏振测量的方案，并成功地将其纳入β-NMR 实验中。根据在Pt塞子中观察到的共振，^ 18 N基态的磁矩已被确定为|mu|。 = 0.3279 * 0.0013 mu_N。 ^ 18 N片段也已被植入单晶Mg塞子中，并且根据观察到的四极频率|eqQ/h| = 73.2 * 1.4 kHz，电四极矩|Q|已推断出 12.3 * 1.2 mb。将得到的mu和Q与壳模型计算进行比较。

项目成果

K.Asahi, H.Ogawa, K.Sakai, et al: "Nuclear moment measurements with polarized radioactive beams" Proceedings of the 3rd Japan-Italy Joint Symposium on Perspectives in Heavy Ion Physics. 3-10 (1999)

K.Asahi、H.Okawa、K.Sakai 等人：“用偏振放射性束进行核矩测量”第三届日本-意大利重离子物理展望联合研讨会论文集。

H.Ogawa, K.Asahi, K.Sakai et al.: "Magnetic moment and electric quadrupole moment of ^N ground state" Phys.Lett.B. (1999)

H.Okawa、K.Asahi、K.Sakai 等人：“^<18>N 基态的磁矩和电四极矩”Phys.Lett.B。

H.Ogawa, K.Asahi, K.Sakai, et al: "Magnetic moment and electric quadrupole moment of ^N ground state" Phys.Lett.B. (to be published). (1999)

H.Okawa、K.Asahi、K.Sakai 等人：“^<18>N 基态的磁矩和电四极矩”Phys.Lett.B。

H.Ogawa, K.Asahi, K.Sakai, et al.: "Magnetic moment and electric quadrupole moment of ^N ground state" Phys.Lett.B. 印刷中. (1999)

H.Okawa、K.Asahi、K.Sakai 等人：“^<18>N 基态的磁矩和电四极矩”Phys.Lett.B. 出版。

H.Sato et al.: "Polarized ^Xe solid for polarizing untable nuclei" Nucl.Instr.Meth.A402. 241-243 (1998)

H.Sato等人：“用于极化不稳定核的极化^ 129 Xe固体”Nucl.Instr.Meth.A402。