Tensor interaction constraints from {beta}-decay recoil spin asymmetry of trapped atoms

Journal Article · Thu Jan 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.015501· OSTI ID:21199525

Pitcairn, J R. A.; Roberge, D ^[1]; Gorelov, A ^[2]; Ashery, D; Aviv, O ^[3]; Behr, J A; Bricault, P G; Dombsky, M; Holt, J D; Jackson, K P; Lee, B; Pearson, M R; Gaudin, A; Dej, B; Hoehr, C ^[4]; Gwinner, G ^[5]; Melconian, D ^[6]

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1. Department of Physics, University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (Canada)
2. Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada)
3. School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv (Israel)
4. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)
5. Department of Physics and Astronomy, University of Manitoba, Winnipeg (Canada)
6. Department of Physics, Texas A and M University, College Station, Texas (United States)

We have measured the angular distribution of recoiling daughter nuclei emitted from the Gamow-Teller {beta} decay of spin-polarized {sup 80}Rb. The asymmetry of this distribution vanishes to lowest order in the standard model (SM) in pure Gamow-Teller decays, producing an observable very sensitive to new interactions. We measure the non-SM contribution to the asymmetry to be A{sub T}=0.015{+-}0.029 (stat) {+-}0.019 (syst), consistent with the SM prediction. We constrain higher-order SM corrections using the measured momentum dependence of the asymmetry, and their remaining uncertainty dominates the systematic error. Future progress in determining the weak magnetism term theoretically or experimentally would reduce the final errors. We describe the resulting constraints on fundamental four-Fermi tensor interactions.

• OSTI ID: 21199525
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
ATOMS
BETA DECAY
CORRECTIONS
DAUGHTER PRODUCTS
EMISSION
FORECASTING
GAMOW-TELLER RULES
INTERACTIONS
MAGNETISM
RECOILS
RUBIDIUM 80
SPIN
SPIN ORIENTATION
STANDARD MODEL
TRAPPING