Mainz 2022 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HK: Fachverband Physik der Hadronen und Kerne
HK 40: Structure and Dynamics of Nuclei VI
HK 40.2: Talk
Wednesday, March 30, 2022, 14:30–14:45, HK-H6
Electric dipole polarizability in 58Ni from forward angle proton scattering — •Isabelle Brandherm1, Peter von Neumann-Cosel1, Hiroaki Matsubara2, and Atsushi Tamii2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2RCNP, Osaka, Japan
Inelastic proton scattering at very forward angles is an excellent tool for studying the dipole response in nuclei [1]. A (p,p′) experiment on 58Ni was performed at the Research Center for Nuclear Physics (RCNP) in Osaka, using a proton beam with 295 MeV and scattering angles close to 0∘. With the present setup the electric dipole response is accessible over a wide excitation energy range. This enables the extraction of photoabsorption cross sections as well as the electric dipole polarizability. The latter is correlated to the neutron skin thickness and thus to the symmetry parameter of the equation of state. In addition the isovector spin-flip M1-response can be observed, which forms an isospin analogon to Gamow-Teller transitions. Electric and magnetic dipole contributions to the total experimental cross section were separated by performing a multipole decomposition analysis based on DWBA calculations.
[1] P. von Neumann-Cosel and A. Tamii, Eur. Phys. J. A 55, 110 (2019).
Supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245.