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Direct determination of the neutron skin thicknesses in $^{40,48}$Ca from proton elastic scattering at $E_p = 295$ MeV

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arxiv 1810.11796 v1 pith:4TO73VDG submitted 2018-10-28 nucl-ex nucl-th

J. Zenihiro , H. Sakaguchi , S. Terashima , T. Uesaka , G. Hagen , M. Itoh , T. Murakami , Y. Nakatsugawa
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T. Ohnishi H. Sagawa H. Takeda M. Uchida H.P. Yoshida S. Yoshida M. Yosoi
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keywords neutrondensityprotonskindistributionsthicknesseseffectiveelastic
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abstract

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.

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Cited by 5 Pith papers

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