Status of the NPDGamma experiment

J. Fry, Ricardo 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. FieselerN. 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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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 (US)
Article number11
JournalHyperfine Interactions
Issue number1
StatePublished - Nov 1 2017


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

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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