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Matter Radii and Density Distributions

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Handbook of Nuclear Physics
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Abstract

In this chapter, experimental and theoretical investigations of the matter radii and density distributions, mainly concerning developments in the last two decades, are described. For stable nuclei, investigations of the neutron density radii are still developing. Measurements of the neutron skin thickness for stable nuclei with large neutron-proton differences are still of great interest. Here, measurements of the parity-violating asymmetry in electron scattering and of the dipole polarizability using proton inelastic scattering are introduced. Investigations with antiprotonic atoms are also introduced. Based on these measurements, the neutron skin thickness has been deduced for some neutron-rich stable nuclei. For unstable nuclei, measurements concerning the matter radii and the density distributions have been very limited. Proton and alpha elastic scattering with inverse kinematics, Coulomb excitation with inverse kinematics, as well as reaction (interaction) cross section measurements have been introduced. Up to now, by using these methods, measurements are still limited to the light and medium-heavy nuclear region (A ≤ 70). Charge-changing cross section measurements, which can be used to extract the charge radius for a nucleus, have been briefly introduced. Although in spite of vigorous efforts to investigate unstable nuclei, there is a still large unknown region in the nuclear chart concerning the matter radii and density distributions.

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Correspondence to Akira Ozawa .

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© 2023 Springer Nature Singapore Pte Ltd.

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Ozawa, A. (2023). Matter Radii and Density Distributions. In: Tanihata, I., Toki, H., Kajino, T. (eds) Handbook of Nuclear Physics . Springer, Singapore. https://doi.org/10.1007/978-981-19-6345-2_40

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