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

Hyperfine Interactions（2016）

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摘要

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 A γ of photons from polarized cold neutron capture on protons is proportional to the Δ I =1 long range weak meson coupling h_π^1 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 A γ can be extracted. Preliminary results of the analysis of A γ are presented.

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关键词

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

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