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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Structure and Dynamics of Nuclei I
HK 9.1: Gruppenbericht
Montag, 20. März 2023, 16:30–17:00, SCH/A118
Studying the Low-Energy Electric Dipole Response With Different Hadronic Probes — •Michael Weinert, Florian Kluwig, Markus Müllenmeister, Miriam Müscher, Barbara Wasilewska, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics
A concentration of electric dipole strength below the neutron separation threshold is known to be common in medium to heavy mass nuclei. The established picture of a neutron-skin oscillation being the single cause for this strength was questioned about 15 years ago, when comparing the excitation in bremsstrahlung experiments to results from a hadronic probe, i.e., (α,α′γ) [1]. Recently, another experimental access was added to the repertoire by investigating the population of states via (d,p) reactions [2]. The strong single-particle character of excited states could be identified by combined experimental and theoretical efforts, describing various realistic observables with great accuracy [3]. This contribution presents an overview of the current status of the hadronic experiments on several nuclei with data taken with the SONIC@HORUS spectrometer at the University of Cologne. The comparison of 119Sn(d,pγ) data at Ed = 8.5 MeV and 120Sn(α,α′γ) data at Eα= 130 MeV will be highlighted, as well as their theoretical comprehension within the Quasiparticle-Phonon-Model and corresponding reaction theory. Supported by the DFG (ZI 510/10-1).
[1] J. Endres et al., Phys. Rev. C 80, 034302 (2009)
[2] M. Spieker et al., Phys. Rev. Lett. 125, 102503 (2020)
[3] M. Weinert et al., Phys. Rev. Lett. 127, 242501 (2021)