Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Structure and Dynamics of Nuclei 8
HK 36.6: Vortrag
Dienstag, 24. März 2015, 18:45–19:00, T/HS2
Nuclear X-ray emission after fusion of heavy ions — •Christian Berner1, Dennis Mücher1, Roman Gernhäuser1, Thomas Faestermann1, Walter Henning1,2, Kosuke Morita3, Kouji Morimoto3, and Daija Kaji3 — 1Technische Universität München, Lehrstuhl E12 — 2Argonne National Laboratory — 3RIKEN, Research Group for Superheavy Elements
The goal is to establish in-beam K-X-ray spectroscopy as a sensitive tool to identify super heavy elements (SHEs) produced in fusion reactions via their proton number. SHEs, formed after cold or hot fusion, are usually identified via the alpha-decay products, which have to be connected to well-known elements. In case of hot fusion, the daughter nuclei quickly undergo spontaneous fission, so that the identification of the produced SHEs is difficult. Using the hot fusion approach in our first test experiments, the resultant products will be analysed by the gas-filled GARIS separator at the RILAC facility at RIKEN. As the X-ray detector is required to have superior energy and timing resolution to best identify the rare events at highest masses and to supress random coincidences as sufficient as possible, we chose a thin and planar geometry, which also reduces the damage caused by fast neutrons. We show first measurements using the MINIBALL Ge array at Munich. Additionally we report on our feasibility studies and on first tests using the new detector at high count rates together with a powerful DAQ system and transistor reset preamplifiers.
Supported by DFG Cluster of excellence: "Origin and structure of the Universe"