Excited-state magnetic moments of the magnesium isotopes

镁同位素的激发态磁矩

• 批准号: 15540302
• 负责人: UENO Hideki
• 金额: $ 2.3万
• 依托单位: RIKEN
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540302/
• 关键词: Transient Field; gadolinium; gamma-ray spectroscopy; Coulomb excitation; nuclear alignment; heavy-ion beams

Transient field(TF) is an effective magnetic field acting on ions passing through ferromagnetic foils. Because of large TF strengths, a large number of nuclear magnetic moments have been measured for short-lifetime excited states on stable nuclei. Such measurements have been carried out using stable-ion beams at velocities v << Z^・ vo, since the velocity dependence of the TF strength B_<TF> is well known in this region, where Z and vo denote the atomic number and the Bohr velocity. Taking into account the fact that radioactive-isotope beams produced in the projectile-fragmentation reaction have high velocities v 【greater than or equal】 Z^・ vo, it is important to determine the velocity dependence of B_<TF> at a velocity of approximately Z^・ vo or higher. From measurements using E=135 MeV ^<22>Ne and ^<24>Mg beams obtained from the K=70 RIKEN AVF cyclotron and the targets consisting of two layers, Au and Gd, we have determined preliminary values of B_<TF> strengths. Their values were smaller than the expected strengths from those determined in the lower velocity region. Theoretically, a sharp decrease in TF strength was predicted at velocities v【greater than or equal】Z^・ vo. The obtained strengths, however, are much larger than this prediction. It rather supports a recent model, with which a rather constant or even increasing trend of B_<TF> strength is predicted at velocities v【greater than or equal】Z^・ vo. Moreover, this observation is in agreement with other measurements obtained at similar velocities. This finding allows us to measure the excited-state magnetic moments of unstable nuclei produced in the projectile-fragmentation reactions.

跨性别磁场（TF）是通过稳定核对稳定的核对稳定的核心进行的螺栓磁性磁力的磁场。 vo，由于TF强度B_ <tf>的速度是众所周知的，表示原子数和Bohr速度。 ，使用E = 135 MEV ^<22> Mg梁从k = 70 riken riken avf cyclotron和Targetstin两层，Au和Au和Au au和Au au和targets toterts，使用E = 135 MEV ^<22> mg梁，它在大约Z ^・ vo或高测量的速度下B_ <tf>的速度依赖性的速度依赖GD，我们确定了B_ <tf>的初步值。获得的优势，它支持了一个最近的模型，在速度V处，B_ <tf>强度的增加趋势被递减[大于或相等] z^・ vo。 c在弹丸碎片反应中产生的不稳定核的力矩。

项目成果

Transient field of ^<24>Mg ions in Gd at high velocities

Gd中^<24>Mg离子高速瞬态场

• 发表时间: 2005
• 期刊: RIKEN Accelerator Progress Report 2004 38(発表予定)
• 作者: H.Ueno et al.

Study on the transient field at very high velocities for the g-factor measurement of excited states in unstable nuclei

不稳定核中激发态 g 因子测量的极高速度瞬态场研究

• 发表时间: 2004
• 期刊: Nuclear Physics A 738
• 作者: A.Yoshimi;H.Ueno et al.
• 通讯作者: H.Ueno et al.