Precision Møller polarimetry for PREX-2 and CREX

King, D. E.; Jones, D. C.; Gal, C.; Gaskell, D.; Henry, W.; Kaplan, A. D.; Napolitano, J.; Park, S.; Paschke, K. D.; Pomatsalyuk, R.; Souder, P. A.

doi:10.1016/j.nima.2022.167506

Title: Precision Møller polarimetry for PREX-2 and CREX

Journal Article · Thu Sep 29 00:00:00 EDT 2022 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2022.167506· OSTI ID:1892499

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Temple Univ., Philadelphia, PA (United States); Syracuse Univ., NY (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Temple Univ., Philadelphia, PA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Temple Univ., Philadelphia, PA (United States)
State Univ. of New York (SUNY), Stony Brook, NY (United States); Mississippi State Univ., Mississippi State, MS (United States)
Univ. of Virginia, Charlottesville, VA (United States)
Kharkov Institute of Physics and Technology (Ukraine)
Syracuse Univ., NY (United States)

The PREX-2 and CREX experiments in Hall A at Jefferson Lab are precision measurements of parity violating elastic electron scattering from complex nuclei. One requirement was that the incident electron beam polarization, typically ≈ 90%, be known with 1% precision. Here, we commissioned and operated a Møller polarimeter on the beam line that exceeds this requirement, achieving a precision of 0.89% for PREX-2, and 0.85% for CREX. The uncertainty is purely systematic, accumulated from several different sources, but dominated by our knowledge of the target polarization. Our analysis also demonstrates the need for accurate atomic wave functions in order to correct for the Levchuk Effect. We describe the details of the polarimeter operation and analysis, as well as (for CREX) a comparison to results from a different polarimeter based on Compton scattering.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC002042; SC0012575; FG02-07ER41522; FG02-05ER41372; AC05-06OR23177; FG02-84ER40146; SC0020422

OSTI ID:: 1892499

Alternate ID(s):: OSTI ID: 1894147; OSTI ID: 1903508

Report Number(s):: JLAB-PHY-22-3655; DOE/OR/23177-5537; arXiv:2207.02150

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1045; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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