A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on Cl-35, Cd-113, and La-139

Type of Work

Article

Date

4-1-2004

Journal Title

Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment

Journal ISSN

0168-9002

Journal Volume

521

First Page

468

Last Page

479

DOI

10.1016/j.nima.2003.11.192

Abstract

An apparatus for measuring parity-violating asymmetries in gamma-ray emission following polarized cold neutron capture was constructed as a 1/10th scale test of the design for the forthcoming n + p --> d + gamma experiment at LANSCE. The elements of the polarized neutron beam, including a polarized He-3 neutron spin filter and a radio frequency neutron spin rotator, are described. Using CsI(Tl) detectors and photodiode current mode readout, measurements were made of asymmetries in gamma-ray emission following neutron capture on Cl-35, Cd-113, and La-139 targets. Upper limits on the parity-allowed asymmetry s(n) (.) (k(gamma) x k(n)) were set at the level of 7 x 10(-6) for all three targets. Parity-violating asymmetries S-n (.) k(gamma) were observed in Cl-35, A(gamma) = (-29.1 +/- 6.7) x 10(-6), and La-139, A(gamma) = (-15.5 +/- 7.1) x 10(-6), values consistent with previous measurements. (C) 2003 Elsevier B.V. All rights reserved.

Notes

Article:
"A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on Cl-35, Cd-113, and La-139," Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment 521, 468-479 (2004). doi: 10.1016/j.nima.2003.11.192.

Authors:
G.S. Mitchell, C.S. Blessinger, J.D. Bowman, T.E. Chupp, K.P. Coulter, M. Gericke, G.L. Jones, M.B. Leuschner, H. Nann, S.A. Page, S.I. Penttilä, T.B. Smith, W.M. Snow, W.S. Wilburn

Hamilton Areas of Study

Physics

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