Excited-state magnetic moments of the magnesium isotopes

瞬态场（TF）是一种通过铁磁沉积物穿过的有效磁场作用。因为TF的强大，一个巨大的核磁性时刻的数目已经被测量出来，用于稳定核的短期刺激状态。使用稳定光束V &lt;&lt; Z^· vo，由于TF强度B_的<TF>速度对该区域已知，Z和vo拒绝原子数和玻尔速度的影响。在预测-片段反应具有高速度v [大于或等于] Z^· vo，这是一个重要的决定，以确定B_在接近Z^· vo或更高的速度的速度对B_的速度的依赖性<TF>。使用E=135 MeV ^<22>Ne和^<24>Mg光束从K=70 RIKEN AVF cyclotron和两层、Au和Gd的目标确定了B_强度的初始值<TF>。他们的价值观比较低速度区所预期的强度要小。理论上，TF强度中的一个尖锐退化被预测为速度V [大于或等于] Z^· Vo。拥有的力量，不管怎样，比这一预测要大得多。It rather supports a recent model，其中B_<TF>strength是predicted at v [greater than or equal] Z^· vo。更重要的是，这一观测是在类似的变化中达成的，与其他测量结果达成的。这是一个允许我们来衡量在预测片段反应中产生的不稳定核核物质的特殊状态磁时刻。

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.