Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Structure and Dynamics of Nuclei VII

HK 48.9: Talk

Thursday, March 30, 2017, 18:45–19:00, F 2

Effects of a broad velocity distribution on DDSM measurements — •David Werner, Alfred Dewald, Claus Müller-Gatermann, Christoph Fransen, Thomas Braunroth, and Alina Goldkuhle — Institut für Kernphysik, Universität zu Köln, D-50937, Germany

The Recoil Distance Doppler-Shift (RDDS) method is a well established method to measure lifetimes of excited nuclear states in the pico-second range. In an RDDS experiment, nuclei of interest, produced in a nuclear reaction, recoil out of a thin target foil and fly with a velocity distributed around a mean velocity v/c. Usually only the mean velocity v/c is considered in the lifetime determination. In cases where the velocity distribution becomes broad it affects the shape and positions of the shifted components of the peaks. In this contribution we will present details on our investigation of the effects caused by broad velocity distributions and point out limits outside of which corrections for the lifetime analysis become important. Further, an estimate for the width of typical velocity distributions, observed in recent RDDS experiments with a rather low v/c of about 0.5%, will be shown. This work is supported by DFG under contract number DE 1516/3-1.