Parity Nonconservation in Neutron Capture on 113Cd

S J. Seestrom, Los Alamos National Laboratory
J D. Bowman, Los Alamos National Laboratory
Bret E. Crawford, Gettysburg College
P P J. Delheij, TRIUMF
C M. Frankle, Los Alamos National Laboratory
C R. Gould, North Carolina State University
D G. Haase, North Carolina State University
M IInuma, Kyoto University
J N. Knudsen, Los Alamos National Laboratory
P E. Koehler, Los Alamos National Laboratory
L Y. Lowie, North Carolina State University
A Masaike, Kyoto University
Y Masuda, National Laboratory of High Energy Physics
G E. Mitchell, North Carolina State University
S I. Penttila, Los Alamos National Laboratory
Y P. Popov, Joint Institute for Nuclear Research
H Postma, Delft University of Technology
N R. Roberson, Duke University
E I. Sharapov, Joint Institute for Nuclear Research
H M. Shimizu, National Laboratory for High Energy Physics
D A. Smith, Los Alamos National Laboratory
Sharon L. Stephenson, Gettysburg College
Y-F Yen, Los Alamos National Laboratory
V W. Yuan, Los Alamos National Laboratory

Copyright held by American Physical Society. First published as SJ Seestrom et al, Parity nonconservation in neutron capture on 113Cd, Physical Review C, 58:5, 2977–2985, doi: 10.1103/PhysRevC.58.2977.


Parity nonconservation was studied for 23 p-wave resonances in 113Cd up to En=500eV at the LANSCE pulsed neutron source using a longitudinally polarized neutron beam and the time-of-flight method. The helicity dependence of the total neutron capture cross section was measured with an enriched 113Cd target and with a target of natural cadmium. Parity violating effects were observed for several resonances in 113Cd and 111Cd. A root-mean-square value of the parity nonconserving matrix element MJ=1=2.9-0.9+1.3meV was obtained for the spin J=1 levels in the compound nucleus 114Cd. This result from the 3p-peak region of the neutron strength function is compared with the parity violation results for nuclei from the 4p-peak region.