Direct determination of the neutron skin thicknesses in $^{40,48}$Ca from proton elastic scattering at $E_p = 295$ MeV
| Autor: | Zenihiro, J., Sakaguchi, H., Terashima, S., Uesaka, T., Hagen, G., Itoh, M., Murakami, T., Nakatsugawa, Y., Ohnishi, T., Sagawa, H., Takeda, H., Uchida, M., Yoshida, H. P., Yoshida, S., Yosoi, M. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The neutron density distributions and neutron skin thicknesses in $^{40,48}$Ca are determined from the angular distributions of the cross sections and analyzing powers of polarized proton elastic scattering at $E_p = 295$ MeV. Based on the framework of the relativistic impulse approximation with the density-dependent effective $NN$ interaction, the experimental data is successfully analyzed, providing precise information of neutron and proton density profiles of $^{40,48}$Ca with small uncertainties. The extracted neutron and proton density distributions give neutron skin thicknesses in $^{40,48}$Ca for $-0.010^{+0.022}_{-0.024}$ fm and $0.168^{+0.025}_{-0.028}$ fm, respectively. The results of the density profiles and the neutron skin thickness in $^{48}$Ca are directly compared with the {\it ab initio} coupled-cluster calculations with interactions derived from chiral effective field theory, as well as relativistic and non-relativistic energy density functional theories. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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