Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Structure and Dynamics of Nuclei VI
HK 40.1: Gruppenbericht
Mittwoch, 30. März 2022, 14:00–14:30, HK-H6
The Microscopic Structure of the Low-Energy Electric Dipole Response of 120Sn — •Michael Weinert, Florian Kluwig, Markus Müllenmeister, Miriam Müscher, Barbara Wasilewska, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, 50937 Cologne, Germany
The low-energy electric dipole response of 120Sn was studied in a 119Sn(d,pγ)120Sn experiment, using the SONIC@HORUS setup at the University of Cologne. Unprecedented access to the single-particle structure of excited Jπ=1− states below and around the neutron-separation threshold was obtained by comparing experimental data to a novel theoretical approach that combines detailed nuclear structure input from energy-density functional (EDF) plus quasiparticle-phonon model (QPM) theory with reaction theory. The EDF+QPM approach correctly predicts the energies of the relevant neutron single-particle levels in 120Sn and especially the fragmentation of the observed spectroscopic strength [1]. Furthermore, the EDF+QPM approach predicts the increasing contribution of complex configurations to states at higher excitation energies, which has been recently suggested as a cause for the discrepancy between (γ,γ’) and (p,p’) experiments [2,3]. This contribution will present the combined efforts and discuss possible connections between the spectral fragmentation observed in 119Sn(d,pγ) and 120Sn(α,α’γ). Supported by the DFG (ZI 510/10-1).
[1] M. Weinert et al., Phys. Rev. Lett. 127, 242501 (2021)
[2] S. Bassauer et al., Phys. Rev. C 102, 034327 (2020)
[3] M. Müscher et al., Phys. Rev. C 102, 014317 (2020)