Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 2WAB: Scientific Opportunities in Nuclear Physics with High-Intensity, Low-Energy Electron Accelerators IIInvited Workshop
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Chair: Toshimi Suda Room: Hilton Waikoloa Village Kings 1 |
Sunday, November 26, 2023 4:00PM - 4:30PM |
2WAB.00001: Low-energy electron scattering for nucleon and nuclei in an extremely low q region Invited Speaker: Yuki Honda Electron scattering is a very powerful tool for studying the structure of nuclei. This is because the electron is a structureless particle, and the electromagnetic interaction is well understood and can be accurately calculated. Electron scattering in the extremely low momentum transfer region is particularly well suited for measuring the nuclear radius, since the radius is determined by the slope of the charge form factor at momentum transfer equal to 0. Such a measurement can reduce an extrapolation uncertainty. Although the radius is a very fundamental property of the nucleus, there are still important unsolved problems such as the proton and deuteron radius puzzle [1-2]. |
Sunday, November 26, 2023 4:30PM - 5:00PM |
2WAB.00002: Electron scattering off online-produced radioactive isotopes at the SCRIT facility Invited Speaker: Masanori Wakasugi The SCRIT facility is the first facility in the world designed specifically for electron scattering experiments on unstable nuclei. Last year we successfully measured the angular distribution of elastically scattered electrons from online-produced unstable nuclei 137Cs. This success marks the beginning of research into unstable nuclei using lepton probes, elementary particles that have only electromagnetic interactions, and the practical use of fixed targets for unstable nuclei will be technological innovations in unstable nuclear research. |
Sunday, November 26, 2023 5:00PM - 5:30PM |
2WAB.00003: Moments of the point-neutron distribution observed through electron scattering in nuclei Invited Speaker: Toshio Suzuki The $n(le 4)$-th moment of the nuclear charge density depends on the $m(mle (n-2))$-th moments of the neutron charge-density, in addition to the $m(mle n)$-th moments of the proton onecite{ks}. The analysis of the moments makes it possible to explore the both point-proton and neutron distributions on the same basis through well-known electromagnetic interaction. There are experimental data of the 4th moments of charge densities for $^{48}$Cacite{emrich} and $^{208}$Pbcite{vries}, those of the $n(le 8)$-th moment for $^3$Hcite{mit} and of the $n(le 10)$-th one for $^3$Hecite{mai}, although the experimental errors of the higher moments are not small enough to be discussed in detail. We have analyzed the calculated values of the 4th moments with the $20$ mean-field(MF) models by the least squares method. The neutron skin thickness has been estimated to be $0.220(0.026)$ and $0.275(0.070)$ fm in $^{40}$Ca and $^{208}$Pb, respectively, in the relativistic MF models, while $0.121(0.036)$ and $0.162(0.068)$ fm in the non-relativistic onescite{kss}. Particularly interesting is the analysis of the moments of the few-body systems, whose wave functions are obtained almost exactly for less phenomenological nuclear interactions. These investigations are in progress, but rough estimation shows that a half of the 6th moment of the charge distribution in $^3$H stems from the neutron charge-density. Precise experimental data for the mirror nuclei may provide us with rich information on their neutron distributions and, moreover, on the neutron size itself, in addition to the proton ones. The Fourier-Bessel and the sum of Gaussian methods fail to estimate the 6th moments of $^{48}$Ca and $^{208}$Pbcite{toshio} from the experimental data available at presentcite{vries}, in contrast to those for the few-body systemscite{mit,mai}. More experimental values of the higher moments are expected to be obtained from low-energy electron scattering. In futurecite{suda}, we would be able to explore in terms of the moments how the neutron distributions play a peculiar role in the structure of neutron-rich unstable nuclei. |
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