Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2001-11-21
Phys.Lett. B534 (2002) 39-44
Physics
Nuclear Physics
Nuclear Experiment
Scientific paper
10.1016/S0370-2693(02)01720-3
The parity nonconserving spin rotation of neutrons in the 0.734-eV p-wave resonance of $^{139}La$ was measured with the neutron transmission method. Two optically polarized $^3He$ cells were used before and behind a a 5-cm long $^{139}La$ target as a polarizer and an analyzer of neutron spin. The rotation angle was carefully measured by flipping the direction of $^3He$ polarization in the polarizer in sequence. The peak-to-peak value of the spin rotation was found to be $ (7.4 \pm 1.1) \times 10^{-3} $ rad/cm which was consistent with the previous experiments. But the result was statisticallly improved. The s-p mixing model gives the weak matrix element as $xW = (1.71 \pm 0.25)$ meV. The value agrees well with the one deduced from the parity-nonconserving longitudinal asymmetry in the same resonance.
Asahi K.
Bowman David J.
Delheij P. P. J.
Funahashi H.
Haseyama T.
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