Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Structure and Dynamics of Nuclei III
HK 12.4: Vortrag
Montag, 14. März 2016, 17:30–17:45, S1/01 A03
First dedicated in-beam X-ray measurement in heavy-ion fusion reactions — •C. Berner1,3, W. Henning2,3, D. Mücher1, R. Gernhäuser1, K. Morita3, K. Morimoto3, D. Kaji3, S. Hellgartner1, R. Lutter4, L. Maier1, Y. Wakabayashi3, and H. Baba3 — 1Technische Universität München, Lehrstuhl E12 — 2Argonne National Laboratory, Physics Division — 3RIKEN, Research Group for Superheavy Elements — 4Ludwig-Maximilians-Universität, München
We report on an experiment aiming at in-beam X- ray spectroscopy of heavy and superheavy elements (SHE). The goal is to establish K-X-ray spectroscopy as a sensitive tool to identify SHE produced in fusion reactions. SHE, formed after cold or hot fusion, are usually identified via the alpha-decay products, which have to be connected to well-known elements. However, various theories predict spontaneous fission as the dominant decay mode for the daughter nuclides. Additionally, half-lives of these elements are expected to increase to values impeding the identification of SHE solely by their decay. The in-beam identification of the characteristic X-rays would precisely allow to identify the charge number of the produced SHE. Experiments were performed at the RIKEN Nishina Centre for Accelerator based Science by using the gas-filled magnet separator GARIS for superheavy element detection. A high-purity, low-energy planar germanium LEGe-detector was adapted to the GARIS system at the target place for the first time in order to measure the element-characteristic, prompt X-ray emission. Supported by DFG Cluster: "Origin and structure of the Universe"