Author/Authors :
T. Haseyama، نويسنده , , K. Asahi، نويسنده , , J.D. Bowman، نويسنده , , P.P.J. Delheij، نويسنده , , H. Funahashi، نويسنده , , S. Ishimoto، نويسنده , , G. Jones، نويسنده , , A. Masaike، نويسنده , , Y. Masuda، نويسنده , , Y. Matsuda، نويسنده , , K. Morimoto، نويسنده , , S. Muto، نويسنده , , S.I. Penttil?، نويسنده , , V.R. Pomeroy، نويسنده , , K. Sakai، نويسنده , , E.I. Sharapov، نويسنده , , D.A. Smith، نويسنده , , V.W. Yuan، نويسنده ,
Abstract :
The parity nonconserving spin rotation of neutrons in the 0.734-eV p-wave resonance of 139La was measured with the neutron transmission method. Two optically polarized 3He cells were used before and behind a 5-cm long 139La target, each as a polarizer and an analyzer for 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 determined to be (7.4±1.1)×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.
