München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Structure and Dynamics of Nuclei III

HK 21.7: Vortrag

Dienstag, 19. März 2019, 15:45–16:00, HS 14

Lifetime measurement of excited states in ¹²⁴Ba via RDDS — •Marcel Beckers¹, Alfred Dewald¹, Marcel Bast¹, Thomas Braunroth¹, Christoph Fransen¹, Kalin Gladnishki², Alina Goldkuhle¹, Jan Jolie¹, Julia Litzinger¹, and Claus Müller-Gatermann¹ — ¹Institute for Nuclear Physics, University of Cologne, Germany — ²Faculty of Physics, University of Sofia, Bulgaria

Yrast B(E2) values in the Ce-Ba-Xe region around A=124 show an unexpected behaviour if compared to collective model predictions in various nuclei (¹²²Ba,¹²⁴Xe,¹²⁶Ce), since they decrease with higher spins. In contrast to this, other nuclei in that region show a normal behaviour, as expected within the framework of the collective model (e.g. ¹²²Xe, ¹²⁶Ba). For ¹²⁴Ba no B(E2) values above the 2₁⁺ → 0_gs⁺ transition are published. It is therefore not clear if the observed behaviour is indeed systematic in this mass region. To shed light on the situation we performed a lifetime measurement on ¹²⁴Ba using the Recoil-Distance Doppler-shift method. The results of this measurement will be presented, together with a comparison of the B_4/2, B_6/2 values with the X(5) model, which predicts the empirical R_4/2, R_6/2 values of ¹²⁴Ba extremely well.