A liquid parahydrogen target for the NPDGamma Experiment

ORAL

Abstract

The NPDGamma Experiment, which is running at the SNS, is in the process of measuring the parity-violating correlation $A_\gamma$ between neutron spin and gamma momentum in the reaction $\overrightarrow{n} + p\rightarrow d + \gamma$ with a projected statistics-limited precision of $10^{-8}$. To achieve this statistical goal, a polarized cold neutron beam is captured in a 16 liter liquid parahydrogen target which includes a cryogenic system, containment mechanisms designed for safe filling, venting and storage of the hydrogen, and a data acquisition system. We will describe the target system and its performance.

*Supported in part by National Science Foundation grants PHY-0100348, PHY- 0457219 and PHY-0758018.

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Authors

  • Chad Gillis

    • Indiana University

  • Walter Fox

    • Indiana University

  • Hermann Nann

    • Indiana University

  • Mike Snow

    • Indiana University

  • Zhaowen Tang

    • Indiana University

  • John Vanderwerp

    • Indiana University

  • Rick Allen

    • Oak Ridge National Laboratory

  • Seppo Pentilla

    • Oak Ridge National Laboratory

  • Jack Thomison

    • Oak Ridge National Laboratory

  • Jiawei Mei

    • Thomas Jefferson National Accelerator Facility

  • Satyaranjan Santra

    • Bhabha Atomic Research Centre