Dresden 2011 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: New Mass Spectrometric Methods and Technical Developments

MS 8.3: Vortrag

Donnerstag, 17. März 2011, 11:15–11:30, GÖR 229

Penning trap-assisted decay spectroscopy at SHIPTRAP — •C. Droese¹, D. Ackermann², L.-L. Andersson³, K. Blaum^4,5, M. Block², M. Dworschak², M. Eibach⁶, S. Eliseev⁴, U. Forsberg⁷, E. Haettner^2,8, F. Herfurth², F.P. Heßberger², S. Hofmann², J. Ketelaer⁴, J. Ketter⁴, G. Marx¹, M. Mazzocco⁹, E. Minaya Ramirez¹⁰, D. Nesterenko¹¹, Yu. Novikov¹¹, W.R. Plaß^2,8, S. Rahaman¹², D. Rodríguez¹³, D. Rudolph⁷, C. Scheidenberger^2,8, L. Schweikhard², S. Stolze¹², P.G. Thirolf¹⁴, G.K. Vorobjev^2,11 und C. Weber¹⁴ — ¹Universität Greifswald — ²GSI Helmholtzzentrum für Schwerionenforschung — ³University of Liverpool — ⁴Max-Planck-Institut für Kernphysik — ⁵Ruprecht-Karls-Universität Heidelberg — ⁶Johannes Gutenberg-Universitẗ Mainz — ⁷Lund University Sweden — ⁸Justus-Liebig-Universität Gießen — ⁹Dipartimento di Fisica and INFN Sezione di Padova — ¹⁰Helmholtz-Institut Mainz — ¹¹PNPI RAS Gatchina — ¹²University of Jyväskylä — ¹³Universidad de Granada — ¹⁴Ludwig Maximilians-Universität Garching

Penning trap-assisted nuclear decay spectroscopy utilizes the high mass selectivity of a Penning trap to prepare an isotopically pure sample of a particular radionuclide for decay measurements. With the mass spectrometer SHIPTRAP at GSI Darmstadt a first experiment was performed to investigate ²⁰⁵Rn and ²¹³Ra combining mass spectrometry and alpha-gamma spectroscopy by adding the new detector setup TRAPSPEC. The Penning trap served as a high-resolution mass separator to prepare a pure sample of ²¹³Ra or ²⁰⁵Rn for implantation into the silicon detector array of TASISpec that was surrounded by three Ge detectors. For ²¹³Ra the well-known gamma lines, X-rays of Rn and gamma-gamma coincidences were observed. In addition, in the same experiment high-precision mass measurements of ²¹³Ra and the radon isotopes ^203−207Rn were performed. Since the characteristic alpha lines of neighboring radon isotopes produced simultaneously in the same irradiation are very similar trap-assisted spectroscopy is crucial to select a particular isotope for an unambiguous interpretation of the observed decay spectrum. Here, the preparation of ²⁰⁵Rn allowed the search for a so far unobserved isomeric state that is expected from the systematics in neighboring odd-A Rn isotopes. Supported by the German Federal Ministry for Education and Research (06GF9103I).