Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Instrumentation XIV
HK 43.1: Vortrag
Mittwoch, 28. Februar 2018, 16:30–16:45, HZO 90
A new plunger device for MINIBALL at HIE-ISOLDE — •Christoph Fransen1, Thomas Braunroth1, Alfred Dewald1, Liam Gaffney2, Alina Goldkuhle1, Jan Jolie1, Julia Litzinger1, Claus Müller-Gatermann1, Peter Reiter1, Stefan Thiel1, and Nigel Warr1 — 1Institut für Kernphysik, Universität zu Köln — 2CERN, Geneva, Switzerland
The recoil distance Doppler-shift method (RDDS) is a very valuable technique for measuring lifetimes of excited nuclear states in the picosecond range from which absolute transition strengths between nuclear excitations can be deduced in an independent manner. Especially during the last years this method was intensively used in combination with radioactive beams for investigating exotic nuclei. A new dedicated plunger device was thus built by our group to implement this method at HIE-ISOLDE where a detection of the Doppler-shifted gamma-rays is realized with the MINIBALL spectrometer for reactions with radioactive beams in inverse kinematics. Besides multiple step Coulomb excitation excited states can be also populated with incomplete and complete fusion reactions. The availability of the new plunger device will open excellent prospects for detailed investigations of exotic nuclei at HIE-ISOLDE. Here we will present the concept of the new device including the special requirements for the use with radioactive beams with energies of several MeV/u. We will also show the performance of the plunger in a first experiment on 28Mg. Supported by the BMBF, Grant No. 05P15PKFNA.