Parity Nonconservation in 106Pd and 108Pd Neutron Resonances

Authors

Bret E. Crawford, Gettysburg CollegeFollow
J D. Bowman, Los Alamos National LaboratoryFollow
P P J. Delheij, TRIUMFFollow
T Haseyama, Kyoto UniversityFollow
J N. Knudsen, Los Alamos National LaboratoryFollow
L Y. Lowie, North Carolina State UniversityFollow
A Masaike, Kyoto UniversityFollow
Y Matsuda, Kyoto UniversityFollow
G E. Mitchell, North Carolina State UniversityFollow
S I. Penttila, Los Alamos National LaboratoryFollow
H Postma, Delft University of TechnologyFollow
N R. Roberson, Duke UniversityFollow
S J. Seestrom, Los Alamos National LaboratoryFollow
E I. Sharapov, Joint Institute for Nuclear ResearchFollow
Sharon L. Stephenson, Gettysburg CollegeFollow
V W. Yuan, Los Alamos National LaboratoryFollow

Document Type

Article

Publication Date

10-1999

Department 1

Physics

Abstract

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 Γ_w=34_-28⁺⁴⁷×10^-7 eV was obtained. For ¹⁰⁸Pd an upper limit on the weak spreading width of Γ_w<12×10^-7 eV was determined at the 68% confidence level.

Copyright Note

This is the publisher's version of the work. This publication appears in Gettysburg College's institutional repository by permission of the copyright owner for personal use, not for redistribution.

Recommended Citation

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

Required Publisher's Statement

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.