Spin exchange optical pumping at pressures near 1 bar for neutron spin filters
Spin exchange optical pumping at pressures near 1 bar for neutron spin filters
复制标题
用于中子自旋过滤器的压力接近 1 bar 的自旋交换光泵浦
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Jones
中科院分区：
文献类型：
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作者：
D. Rich;T. Gentile;T. Smith;A. Thompson;G. Jones
受中子自旋过滤器应用和光谱窄化激光二极管阵列 (LDA) 最新进展的推动，我们正在探索 3He 在接近 1 bar 的压力下的自旋交换光泵浦。我们更有趣的结果之一是生产具有极长弛豫时间的玻璃池。其中最好的寿命为 T1=840 h [其中极化随时间 t 衰减，如 exp(−t/T1)]，主要是在 3He 分压为 0.85 bar 时偶极-偶极贡献为 950 小时。使用宽带 LDA，我们在该电池中获得了 55% 的 3He 核极化。这些结果与 3He 基中子自旋滤波器在中子散射和弱相互作用实验中的应用特别相关。也可以应用于磁力测量和偏振气体磁共振成像。
Motivated by applications to neutron spin filters and recent advances in spectrally narrowed laser diode arrays (LDAs), we are exploring spin exchange optical pumping of 3He at pressures near 1 bar. Among our more interesting results has been the production of glass cells with extremely long relaxation times. The best of these has a lifetime of T1=840 h [where the polarization decays versus time, t, as exp(−t/T1)], dominated by the dipole–dipole contribution of 950 h at a 3He partial pressure of 0.85 bar. Using a broadband LDA, we have obtained 55% 3He nuclear polarization in this cell. These results are particularly relevant to the application of 3He-based neutron spin filters to neutron scattering and weak interaction experiments. Applications to magnetometry and polarized gas magnetic resonance imaging are also possible.