Speaker
Description
The precision result of a deuteron charge radius measurement (2.12562(78) fm) using muonic deuterium spectroscopy has about the 3.5 sigma discrepancy with the average of ordinary deuterium spectroscopy (2.1415(45) fm); this resulted in the deuteron radius puzzle, but the result of electron scattering (2.13(1) fm) is too imprecise to distinguish this discrepancy. New, reliable, and precise results from electron scattering are needed. The ULQ2 facility in Tohoku University realize the form factor measurement of deuteron at the lowest ever Q by using the lowest ever beam energy that is 10 to 60 MeV. In the talk, we will report the recent status of the experiment and discuss the possibility to derive the neutron charge radius that is poorly known from the deuteron charge radius.
