@article{61b95e08bb18401fbd835cee28facaae,
title = "Measurement of parity admixtures in nuclear forces in 180Hf and 159Tb",
abstract = "The circular polarization of the 501 keV strongly hindered γ ray of 180Hf has been measured which yields a value Pγ = (-2.3 ± 0.6) × 10-3 and establishes the presence of a parity non-conserving nuclear force. A similar experiment for the 363 keV γ ray in 159Tb yielded Pγ = (-1 ± 5) × 10-4. The results were obtained with a fast-switching Compton polarimeter and phase-sensitive detection system.",
author = "Lipson, {E. D.} and F. Boehm and Vanderleeden, {J. C.}",
note = "Funding Information: The analyzer for circular polarization (fig. 1) was a forward-scattering magnet assembled from eight rectangular tape-wound cores of 0.1 mm grain oriented silicon iron \[5\]. The laminated construction was chosen to permit reversal of the 17 kG induction (corresponding to a fraction of polarized electrons f = 0.067) in 7.4 ms. The magnet was driven with a precision 10 Hz square-wave derived from the reference sine-wave of a lock-in amplifier (LIA). Owing to the dependence of Compton scattering on the relative polarization of the photon and electron, the detector current I D became modulated by a tiny 10 Hz signal of amplitude I N in proportion to the degree of circular polarization. Letting I+ (I) * This work was performed under the auspices of the US Atomic Energy Commission. Prepared under Contract AT(04-3)-63 for the San Francisco Opera-tions Office, US Atomic Energy Commission. ** Present address: Bell Telephone Laboratories, Murray Hill, New Jersey 07974.* Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",
year = "1971",
month = jun,
day = "7",
doi = "10.1016/0370-2693(71)90265-6",
language = "English (US)",
volume = "35",
pages = "307--310",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "4",
}