Mainz 2022 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HK: Fachverband Physik der Hadronen und Kerne

HK 17: Structure and Dynamics of Nuclei III

HK 17.5: Talk

Monday, March 28, 2022, 17:15–17:30, HK-H6

Investigation of the B(E2; 0_gs⁺→2₁⁺) value of ¹¹⁶Sn — •M. Beuschlein¹, O. Papst¹, J. Kleemann¹, V. Werner¹, N. Pietralla¹, T. Beck^1,3, M. Berger¹, I. Brandherm¹, A. D’Alessio¹, U. Friman-Gayer^1,2, M. Hilcker¹, K. E. Ide¹, J. Isaak¹, R. Kern¹, F. Niederschuh¹, P. C. Ries¹, G. Steinhilber¹, J. Wiederhold¹, and R. Zidarova¹ — ¹IKP, TU Darmstadt — ²Duke University and TUNL, Durham, NC, USA — ³FRIB, East Lansing, MI, USA

The tin isotopes, being proton-magic with a long chain of experimentally accessible nuclei, are an important testing ground for nuclear structure models. Present data show systematic deviations between measured electric quadrupole (E2) ground-state excitation strengths depending on the used techniques. Also, various nuclear structure models come to different predictions on the systematics of B(E2) strengths, particulary around ¹¹⁶Sn. We performed a measurement of ¹¹⁶Sn relative to ¹¹²Sn using the nuclear resonance fluorescence method at S-DALINAC at TU Darmstadt. A beam of continuous bremsstrahlung up to an endpoint energy of 2.2 MeV was used to populate the first excited 2⁺ states of ¹¹²Sn and ¹¹⁶Sn. Photons of the subsequent de-excitation were measured by three high-purity germanium detectors. With our relative measurement we aim to provide a test for a predicted dip of E2 strengths around ¹¹⁶Sn [1], and obtain the absolute B(E2) strength from a previous measurement of ¹¹²Sn.
Supported by the DFG through the research grant SFB 1245.

[1] T. Togashi et al., Phys. Rev. Lett. 121, 062501 (2018)