Type of Work
Physics Letters B
The parity nonconserving spin rotation of neutrons in the 0.734-eV p-wave resonance of La-139 was measured with the neutron transmission method. Two optically polarized He-3 cells were used before and behind a 5-cm long La-139 target, each as a polarizer and an analyzer for neutron spin. The rotation angle was carefully measured by flipping the direction of He-3 polarization in the polarizer in sequence. The peak-to-peak value of the spin rotation was determined to be (7.4+/-1.1) x 10(-3) rad/cm. The result is found to be consistent with the previous experiments, but the result was statistically improved. The s-p mixing model gives the weak matrix element as xW = (1.71+/-0.25) meV. The value agrees well with the one deduced from the parity-nonconserving longitudinal asymmetry in the same resonance. (C) 2002 Elsevier Science B.V. All rights reserved.
Haseyama, T.; Asahi, K.; Bowman, J. D.; Delheij, P. P. J.; Funahashi, H.; Ishimoto, S.; Jones, Gordon L.; Masaike, A.; Masuda, Y.; Matsuda, Y.; Morimoto, K.; Muto, S.; Penttila, S. I.; Pomeroy, V. R.; Sakai, K.; Sharapov, E. I.; Smith, D. A.; and Yuan, V. W., "Measurement of parity-nonconserving rotation of neutron spin in the 0.734-eV p-wave resonance of La-139" (2002). Hamilton Digital Commons.
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