Status of the NPDGamma experiment
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Status of the NPDGamma experiment J. Fry1 · R. Alarcon2 · R. Allen3 · E. Askanazi1 · S. Balascuta2 · L. Barron-Palos4 · S. Baeßler1 · A. Barzilov5 · C. Blessinger3 · D. Blyth2 · J. D. Bowman3 · J. R. Calarco6 · T. E. Chupp7 · C. E. Coppola8 · C. Crawford9 · K. Craycraft9 · M. Dabaghyan6 · D. Evans1 · J. Favela4 · C. Fieseler9 · N. Fomin8 · W. Fox10 · S. Freedman11 · E. Frleˇz1 · C. Fu10 · C. Garcia4 · I. Garishvili8 · M. T. Gericke12 · R. C. Gillis3 · K. Grammer8 · G. L. Greene8 · J. Hamblen13 · C. Hayes8 · F. W. Hersman6 · T. Ino14 · E. B. Iverson3 · G. L. Jones15 · L. Kabir9 · S. Kucucker8 · B. Lauss16 · Y. Li17 · R. Mahurin12 · M. Maldonado-Velazquez4 · M. McCrea12 · Y. Masuda14 · J. Mei10 · R. Milburn9 · G. S. Mitchell18 · P. Mueller3 · S. Muto14 · M. Musgrave8 · H. Nann10 · I. Novikov19 · S. Page12 · D. Parsons13 · D. Poˇcani´c1 · S. I. Penttil¨a3 · W. D. Ramsay20 · A. Salas-Bacci1 · S. Santra21 · P.-N. Seo22 · E. Sharapov23 · M. Sharma7 · F. Simmons9 · T. Smith24 · W. M. Snow10 · J. Stuart13 · E. Tang9 · Z. Tang25 · J. Thomison3 · T. Tong3 · J. Vanderwerp10 · S. Waldecker13 · W. S. Wilburn25 · W. Xu17 · V. Yuan25 · Y. Zhang26 © Springer International Publishing Switzerland 2016
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
This article is part of the Topical Collection on Proceedings of the 6th International Symposium on Symmetries in Subatomic Physics (SSP 2015), VicCanada, 8-12 June 2015 Edited by Michael Gericke and Gerald Gwinner J. Fry
[email protected] 1
University of Virginia, Charlottesville, VA 22903, USA
2
Arizona State University, Tempe, AZ 85281, USA
3
Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37831, USA
4
Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
5
University of Nevada, 4505 S Maryland Pkwy, Las Vegas, NV 89154, USA
6
University of New Hampshire, 105 Main St, Durham, NH 03824, USA
7
University of Michigan, 500 S State St, Ann Arbor, MI 48109, USA
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Hyperfine Interact (2017) 238:11
range weak meson coupling h1π 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. Keywords Nucleon-nucleon interactions · Parity-violation · Nuclear tests of fundamental symmetries · Few nucleon systems PACS 13.75.Cs · 11.30.Er · 24.80.+y · 25.10.+s
1 Theoretical motivation of the hadronic weak interaction The Hadronic Weak Interaction (HWI) among nucleons is interesting and important because it involves the low energy, non-perturbative limit of QCD and remains one of the poorly understood sectors of the electroweak t
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