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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:
 [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [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