skip to main content

DOE PAGESDOE PAGES

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

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:
ORCiD logo [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [5] ;  [4] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ; ORCiD logo [1] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [2] more »;  [2] « less
  1. Texas A&M Univ., College Station, TX (United States). Cyclotron Inst.; Texas A&M Univ., College Station, TX (United States). Dept. of Physics and Astronomy
  2. TRIUMF, Vancouver, BC (Canada)
  3. TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg (Canada). Dept. of Physics and Astronomy
  4. Tel Aviv Univ., Tel Aviv (Israel). School of Physics and Astronomy
  5. Texas A&M Univ., College Station, TX (United States). Cyclotron Inst.; Texas A&M Univ., College Station, TX (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
FG02-93ER40773; FG02-11ER41747
Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 7; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
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
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Beta-decay; fundamental symmetries; optical pumping; atom trapping; parity violation
OSTI Identifier:
1262098
Alternate Identifier(s):
OSTI ID: 1262099; OSTI ID: 1326682

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 States: N. p., Web. doi: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 States. doi: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.. 2016. "Precision measurement of the nuclear polarization in laser-cooled, optically pumped 37 K". United States. doi: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 States},
year = {2016},
month = {7}
}