arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.04526physics.atom-phnucl-ex
收藏

laser冷却光泵$^{37}\mathrm{K}$核极化的精确测量

Precision measurement of the nuclear polarization in laser-cooled, optically pumped $^{37}\mathrm{K}$

Benjamin Fenker, John A. Behr, Dan Melconian, Rhys M. A. Anderson, Melissa Anholm, Daniel Ashery, Richard S. Behling, Iuliana Cohen, Ioana Craiciu, John M. Dono… 展开作者

Benjamin Fenker, John A. Behr, Dan Melconian, Rhys M. A. Anderson, Melissa Anholm, Daniel Ashery, Richard S. Behling, Iuliana Cohen, Ioana Craiciu, John M. Donohue, Christian Farfan, Daniel Friesen, Alexandre Gorelov, James McNeil, Michael Mehlman, Heather Norton, Konstantin Olchanski, Scott Smale, O Theriault, Adrian N. Vantyghem, Claire L. Warner

摘要:

本文报道了激光冷却、光泵$^{37}\mathrm{K}$原子核极化的测量结果,这将使我们能够精确地测量相同原子β衰变的角关联参数。这些结果将被用来测试高精度的弱相互作用的$V-A$框架。在TRIUMF中性原子阱(TRINAT)中,磁光阱(MOT)限制并冷却中性$^{37}\mathrm{K}$原子,并且光泵浦使它们自旋极化。我们监测核极化的相同的原子,是在原位衰变的光致电离的一小部分的部分极化的原子,然后使用标准的光学布洛赫方程来模拟他们的人口分布。我们得到一个平均的核极化$P = 0.9913\pm0.0008$,这是显着更精确的比以前的测量与这种技术。由于我们目前对β-不对称性的测量具有$0.2\%$统计不确定性,因此这里报告的偏振测量不会限制其总体不确定性。这一结果也证明了测量偏振到$<0.1\%$的能力,允许测量角度相关参数到这种精度水平,这将在寻找新的物理学中具有竞争力。

英文摘要:

We report a measurement of the nuclear polarization of laser-cooled, optically-pumped $^{37}\mathrm{K}$ atoms which will allow us to precisely measure angular correlation parameters in the beta-decay of the same atoms. These results will be used to test the $V-A$ framework of the weak interaction at high precision. At the TRIUMF Neutral Atom Trap (TRINAT), a magneto-optical trap (MOT) confines and cools neutral $^{37}\mathrm{K}$ atoms and optical pumping spin-polarizes them. We monitor the nuclear polarization of the same atoms that are decaying in situ by photoionizing a small fraction of the partially polarized atoms and then use the standard optical Bloch equations to model their population distribution. We obtain an average nuclear polarization of $P = 0.9913\pm0.0008$, which is significantly more precise than previous measurements with this technique. Since our current measurement of the beta-asymmetry has $0.2\%$ statistical uncertainty, the polarization measurement reported here will not limit its overall uncertainty. This result also demonstrates the capability to measure the polarization to $<0.1\%$, allowing for a measurement of angular correlation parameters to this level of precision, which would be competitive in searches for new physics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑