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Title: Improved Tensor Current Limit from B 8 β Decay Including New Recoil-Order Calculations

Journal Article · · Physical Review Letters
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [1];  [3];  [4];  [5];  [6];  [7]; ORCiD logo [8]; ORCiD logo [6]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [9]; ORCiD logo [8];  [6]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Soreq Nuclear Research Center, Yavne (Israel)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Chicago, IL (United States)
  4. University of Notre Dame, IN (United States)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Notre Dame, IN (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States)
  7. Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern University, Evanston, IL (United States)
  8. Louisiana State University, Baton Rouge, LA (United States)
  9. Argonne National Laboratory (ANL), Argonne, IL (United States); University of Manitoba, Winnipeg, MB (Canada)
  10. University of Manitoba, Winnipeg, MB (Canada)
+ Show Author Affiliations

A precision measurement of the β+ decay of 8B was performed using the Beta-decay Paul Trap to determine the β-ν angular correlation coefficient aβν. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations to yield the second-most precise measurement from Gamow-Teller decays, aβν = -0.3345 ± 0.0019 stat ± 0.0021syst. This value agrees with the standard model value of -1/3 and improves uncertainties in 8B by nearly a factor of 2. By combining results from 8B and 8Li, a tight limit on tensor current coupling to right-handed neutrinos was obtained. A recent global evaluation of all other precision β decay studies suggested a nonzero value for right-handed neutrino coupling in contradiction with the standard model at just above 3σ. These present results are of comparable sensitivity and do not support this finding.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC)
Grant/Contract Number:
AC52-07NA27344; AC02-06CH11357; SC0023532; SAPPJ-2018-0028; PHY-1913728; PHY-2011890; DGE-1746045
OSTI ID:
2337578
Alternate ID(s):
OSTI ID: 2473874
Report Number(s):
LLNL-JRNL-854133; 1082442; TRN: US2410360
Journal Information:
Physical Review Letters, Vol. 132, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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nuclear tests of fundamental interactions
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