Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 66: Struktur und Dynamik von Kernen X

HK 66.2: Vortrag

Freitag, 25. März 2011, 14:30–14:45, O-1

Lifetime measurements in ⁹⁸Ru using inverse Coulomb excitation and Recoil Distance Doppler Shift Method — •Desiree Radeck^1,2, Volker Werner², Gabriela Ilie², Tan Ahn², Linus Bettermann^1,2, Robert Casperson², Nathan Cooper², Andreas Heinz², Mallory Smith², Elizabeth Williams², Jan Jolie², Raphael Chevrier^2,3, Vassia Anagnostatou^2,4, and Dave McCarthy^2,4 — ¹IKP, Universität zu Köln, Deutschland — ²WNSL, Yale University, USA — ³University of Caen Basse Normandie, France — ⁴University of Surrey, Guildford, UK

Controversial publications can be found about the vibrational character of 98Ru. With big uncertainties in essential quantities like the B_4/2 value, the ratio between the 4₁⁺→ 2₁⁺ and the 2₁⁺→ 0₁⁺ E2 transition strengths, theoretical interpretations are difficult. In order to reduce uncertainties, the Recoil Distance Doppler Shift method was used to measure the lifetimes of the 2_1,2⁺ and 4₁⁺ states. This technique, combined with inverse Coulomb excitation as an excitation mechanism, yields high precision lifetimes. Due to the high v/c several corrections due to relativistic and deorientation effects are required. Both, results and corrections will be discussed, with emphasis on the simultaneous measurement of lifetime and deorientation. The new results on the absolute transition strengths are compared to different theoretic predictions and data on other nuclei in the mass region. Supported by US DOE, grant DE-FG02-91ER-40609. D.R. thanks the DAAD for financial support.