Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Struktur und Dynamik von Kernen
HK 6.1: Gruppenbericht
Montag, 19. März 2012, 14:00–14:30, P 4
Simultaneous Lifetime and Magnetic Moment Measurements — •Desiree Radeck1,2, Volker Werner2, Gabriela Ilie2, Nathan Cooper2, Vassia Anagnostatou2, Tan Ahn2, Christian Bernards1,2, Linus Bettermann1,2, Robert Casperson2, Raphael Chevrier2, Andreas Heinz2, Matthew Hinton2, Jan Jolie1, Dave McCarthy2, and Elizabeth Williams2 — 1IKP, Universität zu Köln — 2WNSL, Yale University, USA
Lifetime measurements of excited states are essential for understanding nuclear structure. Another important observable are magnetic moments that provide information on the microscopic structure of excited states. We present a technique that allows the simultaneous measurement of lifetimes and g factors. By using projectile Coulomb excitation in combination with a plunger setup, lifetimes in the ps region can be determined by employing the well-established RDDS method. The time-dependent deorientation of nuclei in their excited state is measured directly for the deorientation correction in the lifetime analysis. This determination also allows to calibrate parameters of the hyperfine interaction. Under the same experimental conditions, g factors of excited states in an isotopic chain can be measured relative to each other in parallel to the determination of their lifetimes using this g-Plunger technique. The method was succesfully tested at WNSL with stable Ru and Pd isotopes. The technique is introduced, results on the isotopes 96,98,104Ru are presented, and challenges and applications of the method are discussed. Supported by U.S. DOE, Grant DE-FG02-91ER-40609. D.R. thanks the DAAD for financial support.