TY - JOUR
T1 - Measurement of parity admixtures in nuclear forces in 180Hf and 159Tb
AU - Lipson, E. D.
AU - Boehm, F.
AU - Vanderleeden, J. C.
N1 - 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.
PY - 1971/6/7
Y1 - 1971/6/7
N2 - 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.
AB - 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.
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U2 - 10.1016/0370-2693(71)90265-6
DO - 10.1016/0370-2693(71)90265-6
M3 - Article
AN - SCOPUS:4244151985
SN - 0370-2693
VL - 35
SP - 307
EP - 310
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4
ER -