Parity Violation in Neutron Resonances of 103Rh

D A. Smith, Los Alamos National Laboratory
J D. Bowman, Los Alamos National Laboratory
Bret E. Crawford, Gettysburg College
C A. Grossmann, North Carolina State University
T Haseyama, Kyoto University
A Masaike, Kyoto University
Y Matsuda, Kyoto University
G E. Mitchell, North Carolina State University
S I. Penttila, Los Alamos National Laboratory
N R. Roberson, Duke University
S J. Seestrom, Los Alamos National Laboratory
E I. Sharapov, Joint Institute for Nuclear Research
Sharon L. Stephenson, Gettysburg College
V W. Yuan, Los Alamos National Laboratory

Copyright held by American Physical Society. First published as DA Smith et al, Parity Violation in Neutron Resonances of 103Rh, Physical Review C, 60, 045503 , doi: 10.1103/PhysRevC.60.045503.


Parity nonconservation (PNC) was studied in p-wave neutron resonances of 103Rh in the neutron energy range 30 to 490 eV. The helicity dependence of the neutron total cross section of rhodium was determined by capture measurements with the time-of-flight method at the Manuel Lujan Neutron Scattering Center at the Los Alamos National Laboratory. A total of 32 p-wave resonances were studied and statistically significant longitudinal asymmetries were observed for resonances at En=44.5, 110.8, 321.6, and 432.9 eV. A statistical analysis treating the PNC matrix elements as random variables yields a weak spreading widthΓw=(1.42-0.59+1.21)×10-7eV.