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

Abstract

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.

Authors:
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Publication Date:
Research Org.:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Natural Sciences and Engineering Research Council of Canada (NSERC); Israel Science Foundation
OSTI Identifier:
1262098
Alternate Identifier(s):
OSTI ID: 1262099; OSTI ID: 1326682
Grant/Contract Number:  
FG02-11ER41747; FG02-93ER40773
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 18 Journal Issue: 7; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Beta-decay; fundamental symmetries; optical pumping; atom trapping; parity violation

Citation Formats

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., and Warner, C. L. Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K. United Kingdom: N. p., 2016. Web. https://doi.org/10.1088/1367-2630/18/7/073028.
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. Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K. United Kingdom. https://doi.org/10.1088/1367-2630/18/7/073028
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., and Warner, C. L. Fri . "Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K". United Kingdom. https://doi.org/10.1088/1367-2630/18/7/073028.
@article{osti_1262098,
title = {Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K},
author = {Fenker, B. and Behr, J. A. and Melconian, D. and Anderson, R. M. A. and Anholm, M. and Ashery, D. and Behling, R. S. and Cohen, I. and Craiciu, I. and Donohue, J. M. and Farfan, C. and Friesen, D. and Gorelov, A. and McNeil, J. and Mehlman, M. and Norton, H. and Olchanski, K. and Smale, S. and Thériault, O. and Vantyghem, A. N. and Warner, C. L.},
abstractNote = {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.},
doi = {10.1088/1367-2630/18/7/073028},
journal = {New Journal of Physics},
number = 7,
volume = 18,
place = {United Kingdom},
year = {2016},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1367-2630/18/7/073028

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Cited by: 2 works
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