Parity Violation in Neutron Resonances in 107,109Ag

Bowman, J. D.; Corvi, F.; Crawford, B. E.; Delheij, P. P. J.; Frankle, C. M.; Iinuma, Masataka; Knudson, J. N.; Lowie, L. Y.; Masaike, Akira; Masuda, Yasuhiro; Matsuda, Yasuyuki; Mitchell, G. E.; Penttilä, S. I.; Postma, H.; Roberson, N. R.; Seestrom, S. J.; Sharapov, E. I.; Shimizu, Hirohiko M.; Stephenson, S. L.; Yen, Y.-F.; Yuan, V. W.; Zanini, L.

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Parity Violation in Neutron Resonances in 107,109Ag

Authors: J. D. Bowman
F. Corvi
B. E. Crawford
P. P. J. Delheij
C. M. Frankle
Masataka Iinuma
J. N. Knudson
L. Y. Lowie
Akira Masaike
Yasuhiro Masuda
Yasuyuki Matsuda
G. E. Mitchell
S. I. Penttilä
H. Postma
N. R. Roberson
S. J. Seestrom
E. I. Sharapov
Hirohiko M. Shimizu
S. L. Stephenson
Y.-F. Yen
V. W. Yuan
L. Zanini
Publication date: 1 January 1999
Publisher: The Cupola: Scholarship at Gettysburg College
Doi

Abstract

Parity nonconservation (PNC) was studied in p-wave resonances in Ag by measuring the helicity dependence of the neutron total cross section. Transmission measurements on natural Ag were performed in the energy range 32 to 422 eV with the time-of-flight method at the Manuel Lujan Neutron Scattering Center at Los Alamos National Laboratory. A total of 15 p-wave neutron resonances were studied in 107Ag and ninep-wave resonances in 109Ag. Statistically significant asymmetries were observed for eight resonances in 107Ag and for four resonances in109Ag. An analysis treating the PNC matrix elements as random variables yields a weak spreading width of Γw=(2.67-1.21+2.65)×10-7 eV for107Ag and Γw=(1.30-0.74+2.49)×10-7 eV for 109Ag