SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Structure and Dynamics of Nuclei II
HK 30.2: Gruppenbericht
Freitag, 3. September 2021, 14:30–15:00, H4
Study of the dipole response in 58Ni — •Isabelle Brandherm1, Johann Isaak1, Peter von Neumann-Cosel1, Hiroaki Matsubara2, Achim Richter1, Marcus Scheck3, Jaqueline Sinclair3, and Atsushi Tamii2 — 1IKP, TU Darmstadt, Germany — 2RCNP, Osaka, Japan — 3UWS, Paisley, UK
Inelastic proton scattering at very forward angles is an excellent tool for studying the dipole response in nuclei [1]. Reactions with intermediate proton energies and scattering angles close to 0∘ are particularly suited
to investigate the isovector spin-flip M1 resonance. In addition the electric dipole response can be measured over a wide excitation energy range. This provides information about the electric dipole polarizability which is related to the neutron-skin thickness and the density dependence of the symmetry energy. In this talk the analysis of an experiment with a 295 MeV proton beam on a 58Ni target will be presented, which was performed at the Research Centre for Nuclear Physics (RCNP) in Osaka. The
dipole strength distribution of 58Ni has been extensively measured
with nuclear resonance fluorescence [2,3] and inelastic electron scattering [4]. A comparison of the different methods can shed light on various features of nuclear structure such as spin and orbital contributions to the magnetic dipole strength.
[1] P. von Neumann-Cosel and A. Tamii, Eur. Phys. J. A 55, 110 (2019).
[2] M. Scheck et al., Phys. Rev. C 88, 044304 (2013).
[3] J. Sinclair, priv. com. (2019).
[4] W. Mettner et al., Nucl. Phys. A473, 160 (1987). Supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907, SFB 1245.