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

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

doi:10.1016/j.nima.2003.11.192

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

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

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

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+γ experiment at LANSCE. The elements of the polarized neutron beam, including a polarized ³He 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 ³⁵Cl, ¹¹³Cd, and ¹³⁹La targets. Upper limits on the parity-allowed asymmetry s _n·(k_γ × k_n) were set at the level of 7 × 10^-6 for all three targets. Parity-violating asymmetries s_n·k_γ were observed in ³⁵Cl, A_γ = (-29.1±6.7)×10 ^-6, and ¹³⁹La, A_γ = (-15.5±7.1) × 10^-6, values consistent with previous measurements.

Original language	English
Pages (from-to)	468-479
Number of pages	12
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	521
Issue number	2-3
DOIs	https://doi.org/10.1016/j.nima.2003.11.192
State	Published - Apr 1 2004
Externally published	Yes

Funding

The authors would like to thank Mr. G. Peralta and Dr. J.M. O'Donnell for their technical support during this experiment. This work was supported in part by the U.S. Department of Energy (Office of Energy Research, under Contract W-7405-ENG-36), the National Science Foundation (Grant No. PHY-0100348), and the Natural Sciences and Engineering Research Council of Canada.

Keywords

Parity violation
Polarized neutrons
Radiative neutron capture

Access to Document

10.1016/j.nima.2003.11.192

Cite this

Mitchell, G. S., Blessinger, C. S., Bowman, J. D., Chupp, T. E., Coulter, K. P., Gericke, M., Jones, G. L., Leuschner, M. B., Nann, H., Page, S. A., Penttilä, S. I., Smith, T. B., Snow, W. M., & Wilburn, W. S. (2004). A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on ³⁵Cl, ¹¹³Cd, and ¹³⁹La. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 521(2-3), 468-479. https://doi.org/10.1016/j.nima.2003.11.192

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

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+γ experiment at LANSCE. The elements of the polarized neutron beam, including a polarized 3He 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 35Cl, 113Cd, and 139La targets. Upper limits on the parity-allowed asymmetry s n·(kγ × kn) were set at the level of 7 × 10-6 for all three targets. Parity-violating asymmetries sn·kγ were observed in 35Cl, Aγ = (-29.1±6.7)×10 -6, and 139La, Aγ = (-15.5±7.1) × 10-6, values consistent with previous measurements.",

keywords = "Parity violation, Polarized neutrons, Radiative neutron capture",

author = "Mitchell, {G. S.} and Blessinger, {C. S.} and Bowman, {J. D.} and Chupp, {T. E.} and Coulter, {K. P.} and M. Gericke and Jones, {G. L.} and Leuschner, {M. B.} and H. Nann and Page, {S. A.} and Penttil{\"a}, {S. I.} and Smith, {T. B.} and Snow, {W. M.} and Wilburn, {W. S.}",

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language = "English",

volume = "521",

pages = "468--479",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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Mitchell, GS, Blessinger, CS, Bowman, JD, Chupp, TE, Coulter, KP, Gericke, M, Jones, GL, Leuschner, MB, Nann, H, Page, SA, Penttilä, SI, Smith, TB, Snow, WM & Wilburn, WS 2004, 'A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on ³⁵Cl, ¹¹³Cd, and ¹³⁹La', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 521, no. 2-3, pp. 468-479. https://doi.org/10.1016/j.nima.2003.11.192

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on ³⁵Cl, ¹¹³Cd, and ¹³⁹La. / Mitchell, G. S.; Blessinger, C. S.; Bowman, J. D. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 521, No. 2-3, 01.04.2004, p. 468-479.

Research output: Contribution to journal › Article › peer-review

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AU - Chupp, T. E.

AU - Coulter, K. P.

AU - Gericke, M.

AU - Jones, G. L.

AU - Leuschner, M. B.

AU - Nann, H.

AU - Page, S. A.

AU - Penttilä, S. I.

AU - Smith, T. B.

AU - Snow, W. M.

AU - Wilburn, W. S.

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N2 - 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+γ experiment at LANSCE. The elements of the polarized neutron beam, including a polarized 3He 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 35Cl, 113Cd, and 139La targets. Upper limits on the parity-allowed asymmetry s n·(kγ × kn) were set at the level of 7 × 10-6 for all three targets. Parity-violating asymmetries sn·kγ were observed in 35Cl, Aγ = (-29.1±6.7)×10 -6, and 139La, Aγ = (-15.5±7.1) × 10-6, values consistent with previous measurements.

AB - 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+γ experiment at LANSCE. The elements of the polarized neutron beam, including a polarized 3He 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 35Cl, 113Cd, and 139La targets. Upper limits on the parity-allowed asymmetry s n·(kγ × kn) were set at the level of 7 × 10-6 for all three targets. Parity-violating asymmetries sn·kγ were observed in 35Cl, Aγ = (-29.1±6.7)×10 -6, and 139La, Aγ = (-15.5±7.1) × 10-6, values consistent with previous measurements.

KW - Parity violation

KW - Polarized neutrons

KW - Radiative neutron capture

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Mitchell GS, Blessinger CS, Bowman JD, Chupp TE, Coulter KP, Gericke M et al. A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on ³⁵Cl, ¹¹³Cd, and ¹³⁹La. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2004 Apr 1;521(2-3):468-479. doi: 10.1016/j.nima.2003.11.192