Precision measurement of the nuclear polarization in laser-cooled, optically pumped37K
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2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. We report a measurement of the nuclear polarization of laser-cooled, optically pumped 37K atoms which will allow us to precisely measure angular correlation parameters in the -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 37K 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 0.0009, which is significantly more precise than previous measurements with this technique. Since our current measurement of the -asymmetry has 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.
author list (cited authors)
Fenker, B., Behr, J. A., Melconian, D., Anderson, R., Anholm, M., Ashery, D., ... Warner, C. L.
complete list of authors
Fenker, B||Behr, JA||Melconian, D||Anderson, RMA||Anholm, M||Ashery, D||Behling, RS||Cohen, I||Craiciu, I||Donohue, JM||Farfan, C||Friesen, D||Gorelov, A||McNeil, J||Mehlman, M||Norton, H||Olchanski, K||Smale, S||Thériault, O||Vantyghem, AN||Warner, CL