STI Publications - View Publication Form #16516
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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 |
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| 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 |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E12-11-106
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| 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)
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| DOI Link | |
| Dataset(s) | (none) |
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