دورية أكاديمية
Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37K
| العنوان: | Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37K |
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| المؤلفون: | B Fenker, J A Behr, D Melconian, R M A Anderson, M Anholm, D Ashery, R S Behling, I Cohen, I Craiciu, J M Donohue, C Farfan, D Friesen, A Gorelov, J McNeil, M Mehlman, H Norton, K Olchanski, S Smale, O Thériault, A N Vantyghem, C L Warner |
| المصدر: | New Journal of Physics, Vol 18, Iss 7, p 073028 (2016) |
| بيانات النشر: | IOP Publishing, 2016. |
| سنة النشر: | 2016 |
| المجموعة: | LCC:Science LCC:Physics |
| مصطلحات موضوعية: | Beta-decay, fundamental symmetries, optical pumping, atom trapping, parity violation, Science, Physics, QC1-999 |
| الوصف: | We report a measurement of the nuclear polarization of laser-cooled, optically pumped ^37 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 confines and cools neutral ^37 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 $\bar{P}=0.9913\pm 0.0009$ , which is significantly more precise than previous measurements with this technique. Since our current measurement of the β -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 $\lt 0.1 \% $ , allowing for a measurement of angular correlation parameters to this level of precision, which would be competitive in searches for new physics. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1367-2630 |
| Relation: | https://doaj.org/toc/1367-2630 |
| DOI: | 10.1088/1367-2630/18/7/073028 |
| URL الوصول: | https://doaj.org/article/4470cc0a417040fe90cd38b82cf9741d |
| رقم الأكسشن: | edsdoj.4470cc0a417040fe90cd38b82cf9741d |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 13672630 |
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| DOI: | 10.1088/1367-2630/18/7/073028 |