The PRad windowless gas flow target

Journal Article (Journal Article)

We report on a windowless, high-density, gas-flow target at Jefferson Lab that was used to measure rp, the root-mean-square charge radius of the proton. The target achieved its design goal of an areal density of 2 × 1018 atoms/cm2, with the gas uniformly distributed over the 4 cm length of the cell and less than 1% residual gas outside the cell. This design eliminated scattering from the end caps of the target cell, a problem endemic to previous measurements of the proton charge radius in electron scattering experiments, and permitted a precise, model-independent extraction of rp by reaching unprecedentedly low values of Q2, the square of the electron's transfer of four-momentum to the proton.

Full Text

Duke Authors

Cited Authors

  • Pierce, J; Brock, J; Carlin, C; Keith, C; Maxwell, J; Meekins, D; Bai, X; Deur, A; Dutta, D; Gao, H; Gasparian, A; Gnanvo, K; Gu, C; Higinbotham, D; Khandaker, M; Liyanage, N; Meziane, M; Pasyuk, E; Peng, C; Punjabi, V; Xiong, W; Yan, X; Ye, L; Zhang, Y

Published Date

  • July 1, 2021

Published In

Volume / Issue

  • 1003 /

International Standard Serial Number (ISSN)

  • 0168-9002

Digital Object Identifier (DOI)

  • 10.1016/j.nima.2021.165300

Citation Source

  • Scopus