Parity nonconservation (PNC) has been studied in the neutron p-wave resonances of 106Pd and 108Pd in the energy range of 20 to 2000 eV. Longitudinal asymmetries in p-wave capture cross sections are measured using longitudinally polarized neutrons incident on ∼20-g metal-powder targets at LANSCE. A CsI γ-ray detector array measures capture cross section asymmetries as a function of neutron energy which is determined by the neutron time-of-flight method. A total of 21 p-wave resonances in 106Pd and 21 p-wave resonances in 108Pd were studied. One statistically significant PNC effect was observed in106Pd, and no effects were observed in 108Pd. For 106Pd a weak spreading width of Γw=34-28+47×10-7 eV was obtained. For 108Pd an upper limit on the weak spreading width of Γw<12×10-7 eV was determined at the 68% confidence level.
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Crawford, B. E., Bowman, J D., Delheij, P P. J., Haseyama, T., Knudsen, J. N., Lowie, L .Y., Masaike, A., Matsuda, Y., Mitchell, G. E., Penttila, S. I., Postma, H., Roberson, N. R., Seestrom, S. J., Sharapov, E. I., Stephenson, S., and Yuan, V. W. (1999). Parity nonconservation in 106Pd and 108Pd neutron resonances. Physical Review C, 60(055503). http://dx.doi.org/10.1103/PhysRevC.60.055503
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Copyright held by American Physical Society. First published as BE Crawford et al, Parity nonconservation in 106Pd and 108Pd neutron resonances, Physical Review C, 60, 055503, doi: 10.1103/PhysRevC.60.055503.