Measurement of the Magnetic Moment of Neutron Halo Nucleus ^<11>Be

远离稳定区的不稳定原子核由于其奇特的结构而引起了人们的广泛关注。我们提出了一种通用的方法来极化各种不稳定核的核自旋。基于我们的想法的自旋偏振器，加上我们已经成功开发的超流氦原子/离子阱，将使我们能够系统地研究不稳定原子核的磁矩。在我们的方法中，自旋极化将分三步产生：(1)由激光光泵浦产生Rb原子最外层电子的自旋极化。然后不稳定核的离子吸收电子回到它们的离子状态。（ii）最后，电子与原子核之间的超精细相互作用产生核自旋极化。为了研究该偏振器的可行性和最佳工作条件，我们开始了实验台架的建设。试验台已基本完成。到目前为止，我们已经成功地实现了Rb原子90%以上的极化。核自旋极化分析系统的性能测试是非常成功的。核极化很快就会被证明。

Unstable nuclei far from the stability region have been attracting much attention because of their exotic structure. We propose a versatile method to polarize nuclear spin of a wide variety of unstable nuclei. The spin polarizer based on our idea, together with the atom/ion trap in superfluid helium which we have successfully developed, will enable us to systematically investigate the magnetic moments of unstable nuclei.In our method spin polarization will be produced in three steps :(i) The spin polarization of the outermost electron of Rb atom is produced by laser optical pumping.(ii) Then the ions of unstable nuclei pick up the electron to their ionic states.(ii) Finally the hyperfine interaction between the electron and the nucleus produces nuclear spin polarization.In order to study the feasibility and the optimum conditions of the polarizer, we have started construction of a test bench. The test bench has been almost completed. So far we have succeeded in achieving polarization of Rb atom more than 90 %. The performance test of the analyzer system for nuclear spin polarization has been very successful. The nuclear polarization will be demonstrated soon.