Cross section systematics for the lightest Bi and Po nuclei produced in complete fusion reactions with heavy ions

A. N. Andreyev, D. Ackermann, S. Antalic, I. G. Darby, S. Franchoo, F. P. Heßberger, S. Hofmann, M. Huyse, P. Kuusiniemi, B. Lommel, B. Kindler, R. Mann, G. Münzenberg, R. D. Page, S. Saro, B. Sulignano, B. Streicher, K. Van de Vel, P. Van Duppen, and D. R. Wiseman
Phys. Rev. C 72, 014612 – Published 29 July 2005

Abstract

The production of the very neutron-deficient nuclides Bi184192 and Po186192 in the vicinity of the neutron midshell at N = 104 has been studied by using heavy-ion-induced complete fusion reactions in a series of experiments at the velocity filter SHIP. The cross sections for the xn and pxn evaporation channels of the Ti46+Sm144Po190*,Mo98+Mo92Po190*,Cr50,52+Nd142Po192,194*, and Mo94,95+Nb93Bi187,188* reactions were measured. The results obtained, together with the previously known cross section data for the heavier Bi and Po nuclides, are compared with the results of statistical model calculations carried out with the HIVAP code. It is shown that a satisfactory description of the experimental data requires a significant (up to 35%) reduction of the theoretical fission barriers. The optimal reactions for production of the lightest Bi and Po isotopes are discussed.

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  • Received 8 April 2005

DOI:https://doi.org/10.1103/PhysRevC.72.014612

©2005 American Physical Society

Authors & Affiliations

A. N. Andreyev1,2,3, D. Ackermann4,5, S. Antalic6, I. G. Darby2, S. Franchoo5,7, F. P. Heßberger4, S. Hofmann4,8, M. Huyse3, P. Kuusiniemi4, B. Lommel4, B. Kindler4, R. Mann4, G. Münzenberg4,5, R. D. Page2, S. Saro6, B. Sulignano4, B. Streicher6, K. Van de Vel3,*, P. Van Duppen3, and D. R. Wiseman2

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
  • 2Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
  • 3Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
  • 4Gesellschaft fur Schwerionenforschung (GSI), Planckstrasse 1, D-64291 Darmstadt, Germany
  • 5Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099 Mainz, Germany
  • 6Department of Nuclear Physics, Comenius University, Bratislava, Slovakia
  • 7ISOLDE, CERN, CH-1211 Geneve 23, Switzerland
  • 8Physikalisches Institut, J.W. Goethe-Universität, D-60054 Frankfurt, Germany

  • *Present address: Flemish Institute for Technological Research (VITO), Boeretang 200, B-2400 Mol, Belgium.

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Vol. 72, Iss. 1 — July 2005

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