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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/27627
Title: s-process nucleosynthesis in massive stars: New results on 60Fe, 62Ni and 64Ni
Authors: Domingo-Pardo C.
Dillmann I.
Faestermann T.
Giesen U.
Görres J.
Heil M.
Horn S.
Käppeler F.
Köchli S.
Korschinek G.
Lachner J.
Maiti, Moumita
Marganiec J.
Neuhausen J.
Nolte R.
Poutivtsev M.
Reifarth R.
Rugel R.
Schumann D.
Uberseder E.
Voss F.
Walter S.
Wiescher M.
Published in: AIP Conference Proceedings
13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics
Abstract: The s process synthesizes the elements between Fe and Sr in massive stars during two major evolutionary stages, convective core He burning and C shell burning. This scenario implies fascinating consequences for the chemical evolution of the star. For instance, the neutron capture rate at each isotope can have a big influence on the production of many of the subsequent higher mass isotopes. Correspondingly, one needs to know the (n, γ) cross sections of the involved isotopes with high accuracy in order to determine the abundance pattern reliably and to obtain a consistent picture of this stage. This contribution gives an overview on recent and future experiments for the Fe/Ni nucleosynthesis in massive stars. New results on 60Fe, 62Ni and 64Ni are reported. 60Fe is mostly produced during the short convective C shell burning phase, where peak densities of -1011 cm-3 are reached, prior to the SN explosion. The stellar (n, γ) cross section of 60Fe could be measured with a 1 μg sample obtained at PSI (Switzerland), which was sufficient for an activation measurement using the intense, quasi-stellar neutron field for a thermal energy of 25 keV at the Karlsruhe Van de Graaff accelerator. The FZK accelerator was also used for an activation of 62Ni, whereas in this case, the number of 63Ni nuclei produced were determined via accelerator mass spectroscopy at the Maier-Leibnitz-Laboratorium in Garching/Munich. The (n, γ) cross section of 64 Ni at a stellar temperature equivalent to 50 keV has been measured in a collaboration between FZK Karlsruhe and PTB Braunschweig. Finally, complementary time of flight measurements on the Fe and Ni isotopes over a broad energy range are planned at the white neutron source n-TOF of CERN for the future campaign in 2009. © 2009 American Institute of Physics.
Citation: AIP Conference Proceedings (2009), 1090: 230-237
URI: https://doi.org/10.1063/1.3087019
http://repository.iitr.ac.in/handle/123456789/27627
Issue Date: 2009
Keywords: 60Fe 62Ni, 64Ni
Neutron capture cross section
Nuclear astrophysics
ISSN: 0094243X
Author Scopus IDs: 57214907391
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Author Affiliations: Domingo-Pardo, C., Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany, Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany
Dillmann, I., Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany, Physik Department, TU München, 85748 Garching, Germany
Faestermann, T., Physik Department, TU München, 85748 Garching, Germany
Giesen, U., Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
Görres, J., Department of Physics, University of Notre Dame, Notre Dame, IN 46556, United States
Heil, M., Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
Horn, S., Laboratory for Environmental and Radio chemistry, PSI, Switzerland
Käppeler, F., Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany
Köchli, S., Laboratory for Environmental and Radio chemistry, PSI, Switzerland
Korschinek, G., Physik Department, TU München, 85748 Garching, Germany
Lachner, J., Physik Department, TU München, 85748 Garching, Germany
Maiti, M., Physik Department, TU München, 85748 Garching, Germany
Marganiec, J., Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany
Neuhausen, J., Laboratory for Environmental and Radio chemistry, PSI, Switzerland
Nolte, R., Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
Poutivtsev, M., Physik Department, TU München, 85748 Garching, Germany
Reifarth, R., Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
Rugel, R., Physik Department, TU München, 85748 Garching, Germany
Schumann, D., Laboratory for Environmental and Radio chemistry, PSI, Switzerland
Uberseder, E., Physik Department, TU München, 85748 Garching, Germany
Voss, F., Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany
Walter, S., Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany
Wiescher, M., Department of Physics, University of Notre Dame, Notre Dame, IN 46556, United States
Funding Details: The authors wish to thank B. Crowley, R. McKay and W. Meyer for providing the RMB, M. Bull, J. Fry, J. Hanson, B. Kenworthy, R. Schindler, C. Selby, M. Sibley, J. Tinslay, D. Walz, M. Weaver, W. Wisniewski and the SLAC technical staff for their help with the characterisation and installation of RadFETs, S. Metcalfe for commissioning test technical support, L. Adams, P. Hobson, T. Mattison, N. Phinney and S. Watts for useful discussions. The authors gratefully acknowledge the support of PPARC and the British Council, UK, and the US Department of Energy. U.S. Department of Energy, USDOE; British Council; Particle Physics and Astronomy Research Council, PPARC
Corresponding Author: Domingo-Pardo, C.; Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
Appears in Collections:Conference Publications [PH]

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