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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Structure and Dynamics of Nuclei XI
HK 53.5: Vortrag
Mittwoch, 13. März 2024, 18:45–19:00, HBR 19: C 5b
Resolving discrepancies in E2-excitation strengths of mid-shell tin isotopes — •M. Beuschlein1, O. Papst1, J. Kleemann1, N. Pietralla1, V. Werner1, U. Ahmed1, T. Beck1,2, M. Berger1, I. Brandherm1, M.L. Cortes1, A. D’Alessio1, U. Friman-Gayer1,3, I. Jurosevic1, J. Hauf1, M. Hilcker1, K. E. Ide1, J. Isaak1, R. Kern1, P. Koseoglou1, C.M. Nickel1, F. Niederschuh1, K. Prifti1, P. C. Ries1, G. Steinhilber1, T. Stetz1, J. Vogel1, J. Wiederhold1, and R. Zidarova1 — 1IKP, TU Darmstadt, Germany — 2FRIB, East Lansing, MI, USA — 3ESS, Lund, Sweden
Data and theory for the electric quadrupole excitation strength of the proton closed-shell Sn isotopes show an enhancement of the B(E2, 01+ → 21+) values towards N=50, and a seniority-type behavior towards N=82. However, in the transitional region around N=66 various sets of data and theory differ significantly.
In particular, lifetime data using the Doppler-shift attenuation method [1] are at
variance with data from Coulomb excitation. In this work we present
final results of a series of experiments on 112,116,120Sn, utilizing
the nuclear resonance fluorescence (NRF) technique, which offers a model-independent way of measuring E2 strengths. The new data generally support the trend measured in Coulomb excitation experiments, and is in favor of a smooth transition between the different regions.
Supported by the DFG through the research grants SFB 1245 and GRK 2891.
[1] A. Jungclaus et al., Phys. Lett. B 695, 110 (2011)
Keywords: nuclear resonance fluorescence; electric quadrupole excitation strength; proton magicity; collectivity; bremsstrahlung