Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K

Fenker, B.; Behr, J. A.; Melconian, D.; Anderson, R. M. A.; Anholm, M.; Ashery, D.; Behling, R. S.; Cohen, I.; Craiciu, I.; Donohue, J. M.; Farfan, C.; Friesen, D.; Gorelov, A.; McNeil, J.; Mehlman, M.; Norton, H.; Olchanski, K.; Smale, S.; Thériault, O.; Vantyghem, A. N.; Warner, C. L.

doi:10.1088/1367-2630/18/7/073028

Title: Precision measurement of the nuclear polarization in laser-cooled, optically pumped ³⁷ K

Journal Article · Fri Jul 01 00:00:00 EDT 2016 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/18/7/073028· OSTI ID:1262098

; Behr, J. A.; Melconian, D.; Anderson, R. M. A.; Anholm, M.; Ashery, D.;

; Cohen, I.; Craiciu, I.; Donohue, J. M.; Farfan, C.; Friesen, D.; Gorelov, A.; McNeil, J.;

;

; Olchanski, K.; Smale, S.; Thériault, O.; Vantyghem, A. N. more »

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 $${\beta }^{+}$$-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 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 $$\bar{P}=0.9913\pm 0.0009$$, 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.

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Research Organization:: Texas A&M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Natural Sciences and Engineering Research Council of Canada (NSERC); Israel Science Foundation

Grant/Contract Number:: FG02-11ER41747; FG02-93ER40773

OSTI ID:: 1262098

Alternate ID(s):: OSTI ID: 1262099; OSTI ID: 1326682

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Vol. 18 Journal Issue: 7; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 6 works

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Precision Measurement of the $β$ Asymmetry in Spin-Polarized ${}^{37}K$ Decay Fenker, B.; Gorelov, A.; Melconian, D. Physical Review Letters, Vol. 120, Issue 6 https://doi.org/10.1103/physrevlett.120.062502	journal	February 2018

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Title: Precision measurement of the nuclear polarization in laser-cooled, optically pumped ³⁷ K