Abstract
The parity-nonconserving effect was investigated in low-energy (n, γ) reactions for several nuclei with mass numbers of ~100. The longitudinal asymmetry ( A L) was measured in p-wave resonances for 139La and 81Br taking into account the possible angular dependence within the framework of the sp mixing model. A L for 139La was found to be independent of the γ-ray energy thresholds within the experimental errors. From these results the relation between a γ-ray detection experiment and a neutron-transmission experiment is discussed. A L was measured in the p-wave resonances for 81Br, 93Nb, 108Pd, 111Cd, 124Sn and 139La. The obtained nonzero values of A L are A L = (9.8 ± 0.3)%, (2.1 ± 0.1)% and −(1.3 +0.7 −0.4% for 139La( E p = 0.734 eV), 81Br( E p = 0.88 eV) and 111Cd( E p = 4.53 eV), respectively. A theoretical interpretation is discussed in terms of the interference between two amplitudes of the s- and p-wave incident neutrons.
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