Neutron distribution of <sup>208</sup>Pb by low-energy electron scattering
ORAL
Abstract
The charge density distributions of nuclei are best determined by elastic electron scattering, and the stable nuclei that have been studied so far have played an essential role in revealing their internal structure.
Recently, it was pointed out theoretically that the 4th moment of the charge density distribution, <rc4>, contains the information of neutron-distribution radius (ref.[1]).
The experimental determination of <rc4> can be carried out with two methods: 1) <rc4> is derived from the integration of the charge density distribution ρ(r), which is the Fourier transform of F(q) (where q is the momentum transfer) measured from elastic electron scattering, and 2) the Taylor expansion of F(q) in the low-q region.
The neutron radius of 208Pb, whose charge density is the most precisely known, has been extracted from <rc4> following the method 1) (ref.[2]) , and has been found to be consistent with the parity-violating electron scattering results performed out at JLab.
We are currently conducting the method 2) to extract <rc4> from the elastic cross section of 208Pb to be measured covering the momentum transfer range q2 = 0.0025 - 0.065 (MeV/c)2 with low-energy electron-scattering. The required precision for the cross section is the order of 10⁻³ to determine the neutron-distribution radius accurately.
I will discuss the current status and perspectives of this project.
Recently, it was pointed out theoretically that the 4th moment of the charge density distribution, <rc4>, contains the information of neutron-distribution radius (ref.[1]).
The experimental determination of <rc4> can be carried out with two methods: 1) <rc4> is derived from the integration of the charge density distribution ρ(r), which is the Fourier transform of F(q) (where q is the momentum transfer) measured from elastic electron scattering, and 2) the Taylor expansion of F(q) in the low-q region.
The neutron radius of 208Pb, whose charge density is the most precisely known, has been extracted from <rc4> following the method 1) (ref.[2]) , and has been found to be consistent with the parity-violating electron scattering results performed out at JLab.
We are currently conducting the method 2) to extract <rc4> from the elastic cross section of 208Pb to be measured covering the momentum transfer range q2 = 0.0025 - 0.065 (MeV/c)2 with low-energy electron-scattering. The required precision for the cross section is the order of 10⁻³ to determine the neutron-distribution radius accurately.
I will discuss the current status and perspectives of this project.
–
Publication: [1] H. Kurasawa and T. Suzuki, "The nth-order moment of the nuclear charge density and contribution from the neutrons", Prog. Theor. Exp. Phys. 2019, 113D01(2019).<br>[2] H. Kurasawa, T. Suda and T. Suzuki, "The mean square radius of the neutron distribution and the skin thickness derived from electron scattering", Prog. Theor. Exp. Phys. 2021, 013D02(2021).
Presenters
-
Rika Danjo
Authors
-
Rika Danjo