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Bonn 2020 – scientific programme

The DPG Spring Meeting in Bonn had to be cancelled! Read more ...

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei II

HK 7.3: Talk

Monday, March 30, 2020, 17:15–17:30, J-HS H

Isovector-E2 strength of the scissors mode of 152Sm — •K.E. Ide1, T. Beck1, M. Berger1, S. Finch2, U. Friman-Gayer1, J. Kleemann1, FNU Krishichayan2, B. Löher1, O. Papst1, N. Pietralla1, D. Savran3, W. Tornow2, M. Weinert4, V. Werner1, and J. Wiederhold11IKP, TU Darmstadt — 2TUNL, Duke University, Durham NC, USA — 3GSI, Darmstadt — 4IKP, Universität zu Köln

The nucleus 152Sm is well known to be located at the N=90 quantum shape-phase transition (QSPT) boundary, mainly set by the residual forces between valence protons and neutrons. Since the scissors mode (SM) is a collective, isovector excitation, its decay characteristics are highly dependent on these forces and sensitive to the QSPT. The SM is known for its M1-excitation strength, however, data on isovector E2 properties are sparse [1]. The SM of 152Sm was investigated in a nuclear resonance fluorescence experiment performed at the High-Intensity γ-Ray Source with a quasi-monoenergetic, polarized photon beam with an energy of 2.99(5) MeV. Emitted photons were detected by four high-purity germanium detectors positioned at angles sensitive to the multipolarities of the decay radiation of 1π states. The isovector E2 transition of the SM of 152Sm to its first 2+ state has been deduced from the E2/M1 multipole mixing ratio of the 1sc+ → 21+ transition. Experimental results are compared to predictions of the interacting boson model 2, yielding proton and neutron effective boson charges.

*Supported by the DFG under grant No. SFB 1245

[1] T.Beck et al., Phys. Rev. Lett. 118 (2017) 212502

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