STI Publications - View Publication Form #16516
| Back to Search Results |
Publication Information
| Title | The PRad Windowless Gas Flow Target | ||||
| Abstract | We report on a windowless, high-density, gas flow target at Jefferson Lab that was used to measure $r_p$, the root-mean-square charge radius of the proton. To our knowledge, this is the first such system used in a fixed-target experiment at a (non-storage ring) electron accelerator. The target achieved its design goal of an areal density of 2$\times$10$^{18}$ atoms/cm$^2$, 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 $r_p$ by reaching unprecedentedly low values of $Q^2$, the square of the electron's transfer of four-momentum to the proton. | ||||
| Author(s) | Joshua Pierce, James Brock, Christopher Keith, James Maxwell, Dave Meekins, Xinzhan Bai, Alexandre Deur, Dipangkar Dutta, Haiyan Gao, Ashot Gasparian, Kondo Gnanvo, Chao Gu, Douglas Higinbotham, Mahbub Khandaker, Nilanga Liyanage, Mehdi Meziane, Eugene Pasyuk, C. Peng, Vina Punjabi, Weizhi Xiong, X. Yan, Li Ye, Yang Zhang, Chris Carlin | ||||
| Publication Date | April 2021 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Exp Nuclear Physics / Technical Support Groups / Cryo/Polarized Targets | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
|
||||
| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E12-11-106
|
||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Nuclear Instruments & Methods in Physics Research, Section A |
| Refereed | Yes |
| Volume | in press |
| Issue | |
| Page(s) |
Attachments/Datasets/DOI Link
| Document(s) |
PRadTargetNIM.pdf
(STI Document)
1-s2.0-S0168900221002849-main.pdf
(Accepted Manuscript)
|
| DOI Link | |
| Dataset(s) | (none) |
| Back to Search Results |