Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Structure and Dynamics of Nuclei I

HK 5.1: Group Report

Monday, March 11, 2024, 16:45–17:15, HBR 19: C 5a

Investigating the Pygmy Dipole Resonance: A multi-messenger approach — •Markus Müllenmeister, Michael Weinert, Florian Kluwig, Miriam Müscher, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

The enhanced dipole (E1) response below and around the neutron separation energy of heavy and medium mass nuclei is known as the Pygmy Dipole Resonance (PDR). The historical perspective of a neutron skin oscillation being the sole cause of these excitations has been challenged in recent decades [1]. Despite continued research efforts, the structure, emergence, and evolution of the PDR remain largely unknown [2]. To access this information, systematic studies encompassing different probes on a variety of target nuclei, as well as comparable results in similar mass regions, are needed [3]. Recently, efforts have been undertaken to single out specific phenomena using complementary experiments with hadronic and electromagnetic probes [4], as well as neutron transfer reactions [5]. This contribution will outline the experimental methods used and highlight results from the complementary approaches. Supported by the DFG (ZI 510/10-1).

[1] J. Endres et al., Phys. Rev. C 80 (2009) 034302.

[2] A. Bracco et al., Prog. Part. Nucl. Phys. 106 (2019) 360.

[3] D. Savran et al., Phys. Lett. B 786 (2018) 16.

[4] M. Müscher et al., Phys. Rev. C 102 (2020) 014317.

[5] M. Weinert et al., Phys. Rev. Lett. 127 (2021) 242501.

Keywords: Pygmy Dipole Resonance; Multimessenger; NRF; Hadronic Probe; Neutron Transfer