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ID 19328
file
creator
Stephenson, S. L.
Bowman, J. D.
Crawford, B. E.
Delheij, P. P. J.
Frankle, C. M.
Knudson, J. N.
Lowie, L. Y.
Masaike, Akira
Matsuda, Yasuyuki
Mitchell, G. E.
Penttilä, S. I.
Postma, H.
Roberson, N. R.
Seestrom, S. J.
Sharapov, E. I.
Yen, Y.-F.
Yuan, V.W.
abstract
Parity nonconservation (PNC) was measured for 24 p-wave resonances from 8 to 300 eV in 232Th by measuring the helicity dependence of the total neutron cross section for epithermal neutrons with an improved experimental system. Ten resonances show statistically significant parity violation. For these ten resonances the analyzing powers are all positive, thus confirming the previously observed sign correlation. The data are fit to the sum of two terms, a constant asymmetry and a fluctuating asymmetry. With this ansatz the root-mean-square PNC matrix element M = 1.12 meV, which corresponds to a weak spreading width Γw = 4.7× 10-7 eV. For the neighboring nuclide 238U there is no constant offset, suggesting that the sign correlation is specific to 232Th.
journal title
Physical Review C - Nuclear Physics
volume
Volume 58
issue
Issue 2
start page
1236
end page
1246
date of issued
1998-10
publisher
American Physical Society
issn
0556-2813
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1998 The American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter



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