Journal
PHYSICAL REVIEW C
Volume 83, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.83.022501
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Funding
- NSF [PHY-0457219, PHY-0758018, DE-AI02-93ER40784, DE-FG02-95ER40901]
- Division Of Physics
- Direct For Mathematical & Physical Scien [901152] Funding Source: National Science Foundation
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We report an upper bound on parity-violating neutron spin rotation in He-4. This experiment is the most sensitive search for neutron-weak optical activity yet performed and represents a significant advance in precision in comparison to past measurements in heavy nuclei. The experiment was performed at the NG-6 slow-neutron beamline at the National Institute of Standards and Technology (NIST) Center for Neutron Research. Our result for the neutron spin rotation angle per unit length in He-4 is d phi/dz = [+ 1.7 +/- 9.1(stat.) +/- 1.4(sys.)] x 10(-7) rad/m. The statistical uncertainty is smaller than current estimates of the range of possible values of d phi/dz in n+He-4.
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