NIST logo

Publication Citation: An Upper Bound on Parity Violating Neutron Spin Rotation in He-4

NIST Authors in Bold

Author(s): Jeffrey S. Nico; W M. Snow; Christopher D. Bass; Tiffany D. Bass; B. E. Crawford; K. F. Gan; B R. Heckel; D Lou; D M. Markoff; A M. Micherdzinska; Hans P. Mumm; A. K. Opper; M Sarsour; E I. Sharapov; H E. Swanson; S. C. Walbridge; V Zhumabekova;
Title: An Upper Bound on Parity Violating Neutron Spin Rotation in He-4
Published: January 31, 2011
Abstract: 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. Our result for the neutron spin rotation angle per unit length in He-4 is dphi/dz = (+1.7 +/- 9.1(stat) +/- 1.4(sys))x10^{-7} rad/m. The statistical uncertainty is smaller than the best current estimates of the range of possible values of dphi/dz in n+He-4. The systematic uncertainty achieved using our experimental technique is small enough to encourage more precise measurements.
Citation: Physics Letters B
Pages: pp. 022501-1 - 022501-5
Keywords: cold neutron; effective field theory; hadronic parity violation; weak interaction
Research Areas: Neutron Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (235KB)