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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/25383
Title: Study of the average charge states of 188Pb and 252,254No ions at the gas-filled separator TASCA
Authors: Khuyagbaatar J.
Ackermann D.
Andersson L.-L.
Ballof J.
Brüchle W.
Düllmann C.E.
Dvorak J.
Eberhardt K.
Even J.
Gorshkov A.
Graeger R.
Heßberger F.-P.
Hild D.
Hoischen R.
Jäger E.
Kindler B.
Kratz J.V.
Lahiri S.
Lommel B.
Maiti, Moumita
Merchan E.
Rudolph D.
Schädel M.
Schaffner H.
Schausten B.
Schimpf E.
Semchenkov A.
Serov A.
Türler A.
Yakushev A.
Published in: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Abstract: The average charge states of 188Pb and 252,254No ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of 254No. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called density effect, on the performance of TASCA was investigated. The average charge states of 254No ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived. © 2012 Elsevier B.V.
Citation: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 689: 40-46
URI: https://doi.org/10.1016/j.nima.2012.06.007
http://repository.iitr.ac.in/handle/123456789/25383
Issue Date: 2012
Keywords: Average charge state
Gas-filled separator
Heavy ion
TASCA
ISSN: 1689002
Author Scopus IDs: 14826956100
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Author Affiliations: Khuyagbaatar, J., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Helmholtz-Institut Mainz, 55099 Mainz, Germany
Ackermann, D., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Andersson, L.-L., Lund University, 22100 Lund, Sweden, HIM, Germany
Ballof, J., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Brüchle, W., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Düllmann, C.E., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Helmholtz-Institut Mainz, 55099 Mainz, Germany, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Dvorak, J., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Helmholtz-Institut Mainz, 55099 Mainz, Germany
Eberhardt, K., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Even, J., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Gorshkov, A., Technische Universität München, 85748 Garching, Germany
Graeger, R., Technische Universität München, 85748 Garching, Germany
Heßberger, F.-P., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Helmholtz-Institut Mainz, 55099 Mainz, Germany
Hild, D., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Hoischen, R., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Lund University, 22100 Lund, Sweden
Jäger, E., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Kindler, B., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Kratz, J.V., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Lahiri, S., Saha Institute of Nuclear Physics, Kolkata 700064, India
Lommel, B., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Maiti, M., Saha Institute of Nuclear Physics, Kolkata 700064, India
Merchan, E., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, Lund University, 22100 Lund, Sweden, Universidad Nacional de Colombia, Bogotá, Colombia
Rudolph, D., Lund University, 22100 Lund, Sweden
Schädel, M., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Schaffner, H., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Schausten, B., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Schimpf, E., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Semchenkov, A., GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, University of Oslo, Norway
Serov, A., Paul Scherrer Institute, 5232 Villigen, Switzerland
Türler, A., Technische Universität München, 85748 Garching, Germany, PSI, Switzerland
Yakushev, A., Technische Universität München, 85748 Garching, Germany, GSI, Germany
Funding Details: We thank the ECR ion source and UNILAC staff for providing 48 Ca beams with high and stable intensity. We are grateful to `J. Steiner, W. Hartmann, and A. Hübner for production of the target materials and preparation of the target wheels. We thank K.E. Gregorich for providing us with the TSIM code. These studies were financially supported the GSI F&E program and by the Research Center “Elementary Forces and Mathematical Foundations” (EMG) at Mainz University. Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF: 144511
Corresponding Author: Khuyagbaatar, J.; GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany; email: J.Khuyagbaatar@gsi.de
Appears in Collections:Journal Publications [PH]

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