Electric dipole polarizability of $^{58}$Ni

• DOI: 10.48550/arxiv.2410.00610
• Publication Date: 2024-01-01
• Authors: Brandherm, I.; Bonaiti, F.; von Neumann-Cosel...; Bacca, S.; Colò, G.; Jansen, G. R.; Li, Z. Z.; Matsubara, H.; Niu, Y. F.; Reinhard, P. -G.; Richter, A.; Roca-Maza, X.; Tamii, A.
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; FOS: Physical sciences; Nuclear Experiment (nucl-ex); Nuclear Experiment

8 pages, 4 figures<br/>The electric dipole strength distribution in $^{58}$Ni between 6 and 20 MeV has been determined from proton inelastic scattering experiments at very forward angles at RCNP, Osaka. The experimental data are rather well reproduced by quasiparticle random-phase approximation calculations including vibration coupling, despite a mild dependence on the adopted Skyrme interaction. They allow an estimate of the experimentally inaccessible high-energy contribution above 20 MeV, leading to an electric dipole polarizability $α_\mathrm{D}(^{58}{\rm Ni}) = 3.48(31)$ fm$^3$. This serves as a test case for recent extensions of coupled-cluster calculations with chiral effective field theory interactions to nuclei with two nucleons on top of a closed-shell system.<br/>