Status of the NPDGamma Experiment at the SNS

Ricardo Alarcon, S. Balascuta

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The main goal of the NPDGamma experiment is to measure the gamma-ray asymmetry with respect to the neutron spin direction in the nuclear reaction n+ p → d + γ. The up-down asymmetry Aγ has a predicted size of the order of 5 ·10-8, and the NPDGamma experiment is designed to measure it with an uncertainty of about 10-8. To test the entire apparatus the gamma-ray asymmetry from neutron capture was measured using a Cl target followed by measurements on Al to establish the relevant background levels. At present the experiment is taking data with a liquid H2 target to measure the parity violation on the n+ p → d + γ reaction and extract the ΔI = 1 part of the hadronic weak interaction.

Original languageEnglish (US)
Pages (from-to)149-155
Number of pages7
JournalHyperfine Interactions
Issue number1-3
StatePublished - Mar 2013


  • Gamma rays
  • Neutron capture
  • Parity violation
  • Weak interation

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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