Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DM: Instrumentation II
9:00 AM–11:45 AM,
Thursday, October 25, 2018
Hilton
Room: Queen's 6
Chair: Alexandra Gade, Michigan State University
Abstract ID: BAPS.2018.HAW.DM.4
Abstract: DM.00004 : A high-resolution dipole spectrometer for low-energy electron scattering to determine proton charge radius*
9:45 AM–10:00 AM
Presenter:
Taihei Aoyagi
(ELPH, Tohoku Univ.)
Authors:
Taihei Aoyagi
(ELPH, Tohoku Univ.)
Yuki Honda
(Tohoku University)
Keita Kasama
(ELPH, Tohoku Univ.)
Yukie Maeda
(Miyazaki University)
Toshiya Muto
(ELPH, Tohoku Univ.)
Kazuki Namba
(ELPH, Tohoku Univ.)
Ken'ichi Nanbu
(ELPH, Tohoku Univ.)
Toshimi Suda
(Tohoku University)
Ken Takahashi
(ELPH, Tohoku Univ.)
Shota Takayama
(ELPH, Tohoku Univ.)
Tadaaki Tamae
(Tohoku University)
Kyo Tsukada
(Tohoku University)
The proton radius puzzle is the discrepancy between the proton radius determined by electron scattering and hydrogen spectroscopy, and that by muonic hydrogen spectroscopy. This discrepancy remains unresolved and is a topic of ongoing research in the world.
We are going to determine the proton radius by low-energy electron scattering at ELPH, Tohoku University. The proton radius is defined as a derivative of the charge form factor at the momentum transfer squared zero. Therefore, we are going to measure the scattering cross section under the lowest-ever momentum transfer squared using the low-energy (~60 MeV) electron beam.
Since the change in the charge form factor at momentum transfer measured in this experiment is only around 2 %, the cross section must be measured with an accuracy at 0.1%. We are constructing a high-resolution dipole spectrometer.
In this talk, I will discuss the design of the spectrometer and the evaluation of the background due to multiple scattering effect of low energy scattered electrons.
*This work is supported by Grants-in-Aid for Scientific Research (S) (Grants No. 16H06340) from Japan Society for the Promotion of Science.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.DM.4
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