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Status of the NPDGamma experiment

  • J. Fry
  • , R. Alarcon
  • , R. Allen
  • , E. Askanazi
  • , S. Balascuta
  • , L. Barron-Palos
  • , S. Baeßler
  • , A. Barzilov
  • , C. Blessinger
  • , D. Blyth
  • , J. D. Bowman
  • , J. R. Calarco
  • , T. E. Chupp
  • , C. E. Coppola
  • , C. Crawford
  • , K. Craycraft
  • , M. Dabaghyan
  • , D. Evans
  • , J. Favela
  • , C. Fieseler
  • N. Fomin, W. Fox, S. Freedman, E. Frlež, C. Fu, C. Garcia, I. Garishvili, M. T. Gericke, R. C. Gillis, K. Grammer, G. L. Greene, J. Hamblen, C. Hayes, F. W. Hersman, T. Ino, E. B. Iverson, G. L. Jones, L. Kabir, S. Kucucker, B. Lauss, Y. Li, R. Mahurin, M. Maldonado-Velazquez, M. McCrea, Y. Masuda, J. Mei, R. Milburn, G. S. Mitchell, P. Mueller, S. Muto, M. Musgrave, H. Nann, I. Novikov, S. Page, D. Parsons, D. Počanić, S. I. Penttilä, W. D. Ramsay, A. Salas-Bacci, S. Santra, P. N. Seo, E. Sharapov, M. Sharma, F. Simmons, T. Smith, W. M. Snow, J. Stuart, E. Tang, Z. Tang, J. Thomison, T. Tong, J. Vanderwerp, S. Waldecker, W. S. Wilburn, W. Xu, V. Yuan, Y. Zhang
  • University of Virginia
  • Arizona State University
  • Oak Ridge National Laboratory
  • Universidad Nacional Autónoma de México
  • University of Nevada, Las Vegas
  • University of New Hampshire
  • University of Michigan, Ann Arbor
  • University of Tennessee, Knoxville
  • University of Kentucky
  • Indiana University Bloomington
  • University of California at Berkeley
  • University of Manitoba
  • University of Tennessee, Chattanooga
  • High Energy Accelerator Research Organization, Tsukuba
  • Hamilton College
  • Paul Scherrer Institute
  • Chinese Academy of Sciences
  • University of California at Davis
  • Western Kentucky University
  • TRIUMF
  • Homi Bhabha National Institute
  • Duke University
  • Joint Institute for Nuclear Research
  • University of Dayton
  • Los Alamos National Laboratory
  • Lanzhou University

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The NPDGamma experiment measures the parity-violating (PV) gamma asymmetry from polarized cold neutrons captured on protons at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The (PV) neutron spin asymmetry Aγ of photons from polarized cold neutron capture on protons is proportional to the ΔI=1 long range weak meson coupling hπ1 between nucleons in the hadronic weak interaction (HWI). Liquid para-hydrogen production data taking concluded in April 2014 and once the background aluminum asymmetry measurements are complete, the PV asymmetry Aγ can be extracted. Preliminary results of the analysis of Aγ are presented.

Original languageEnglish
Article number11
JournalHyperfine Interactions
Volume238
Issue number1
DOIs
StatePublished - 1 Nov 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016, Springer International Publishing Switzerland.

Funding

FundersFunder number
National Science Foundation1614839, 1126683, 1506320, 1506021

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 7 - Affordable and Clean Energy
      SDG 7 Affordable and Clean Energy

    Keywords

    • Few nucleon systems
    • Nuclear tests of fundamental symmetries
    • Nucleon-nucleon interactions
    • Parity-violation

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