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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Structure and Dynamics of Nuclei I

HK 5.2: Talk

Monday, March 11, 2024, 17:15–17:30, HBR 19: C 5a

Investigation of the dipole strength distribution in ⁷⁰Zn up to the neutron threshold^a — •J. Hauf¹, V. Werner¹, M. Beuschlein¹, R. Beyer², A. Gupta¹, T. Hensel², J. Isaak¹, A. Junghans², J. Kleemann¹, P. Koseoglou¹, E. Masha², C. Nickel¹, O. Papst¹, M. Pichotta², N. Pietralla¹, K. Prifti¹, K. Römer², K. Schmidt², R. Schwengner², S. Turkat², J. Vogel¹, A. Wagner², and A. Yadev² — ¹IKP, TU Darmstadt — ²Helmholtz-Zentrum Dresden-Rossendorf

We perform a series of experiments to study the dipole strength distribution of the neutron-rich isotope ⁷⁰Zn, up to its neutron threshold of about 9.2 MeV. ⁷⁰Zn is of particular interest due to its location on the N=40 harmonic oscillator shell and in view of shape coexistence in this region. The main goal of the present study is in particular to obtain information on the E1 strength distribution, typically attributed to the pygmy dipole resonance, and possible M1 strength embedded in the dipole response. Following our initial nuclear resonance fluorescence bremsstrahlung experiment at γELBE with a maximum energy of 11.5 MeV, we now measured at a lower maximum energy of 7.5 MeV, in order to resolve ambiguities in the assignments of observed transitions and excited states. The present status of the analysis and an outlook on further planned experiments will be given.

^aThis work was supported by the DFG under grant numbers SFB 1245, project-ID 279384907, and GRK 2891, project-ID 499256822

Keywords: Nuclear resonance fluorescence; Pygmy resonance; dipole strength distribution; nuclear photonics