Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 13: Structure and Dynamics of Nuclei III

HK 13.6: Vortrag

Dienstag, 17. März 2026, 18:00–18:15, AM 00.011

RDDS Lifetime Measurements in Neutron-Deficient ¹⁷²Os — •Alina Didik¹, Christoph Fransen¹, Casper-David Lakenbrink¹, Dania Al Daas¹, Andrey Blazhev¹, Jan Jolie¹, Carina Heymer¹, Franziskus von Spee¹, Katarzyna Hadynska-Klek², Grzegorz Jaworski², Michalina Komorowska², Michal Kowalczyk², Adam Nalecz-Jawecki², Pawel Napiorkowski², Marcin Palacz², Krysztof Rusek², and Katarzyna Wrzosek-Lipska² — ¹IKP, University of Cologne, Germany — ²Heavy Ion Laboratory, University of Warsaw, Poland

In the lighter isotopes ^168,170Os the B_4/2 = B(E2;4₁⁺ → 2₁⁺)/B(E2;2₁⁺ → 0₁⁺) ratios drop far below the values expected for collective nuclei, indicating a rapid structural change, explained only very recently to result from strong band mixing including triaxiality. The nucleus ¹⁷²Os appears to lie just at the boundary of this evolution. Earlier data on transition strengths [1] suggest rotor-like behavior for the 2₁⁺ and 4₁⁺ states, but a sharp increase of the B(E2) values from the 6₁⁺ and 8₁⁺ states hints for structural changes within the lower yrast states. However, the latter is not expected from the level energy systematics. To clarify this discrepancy, we performed a new RDDS experiment on ¹⁷²Os at HIL using the Cologne plunger combined with the EAGLE γ-ray spectrometer. For the first time, level lifetimes were determined from a γγ coincidence analysis to eliminate the need for assumptions on delayed feeding in contrast to the earlier dataset. Supported by the DFG, Grant No. FR 3276/3-1.

[1] A. Virtanen et al., Nucl. Phys. A591, 145 (1995)

Keywords: Lifetime measurements; Nuclear structure; Recoil distance method