Prevalence of Fission and Evaporation in the Decay of Heavy Nuclei Excited up to 1000 MeV with Energetic Antiprotons

U. Jahnke, W. Bohne, T. von Egidy, P. Figuera, J. Galin, F. Goldenbaum, D. Hilscher, J. Jastrzebski, B. Lott, M. Morjean, G. Pausch, A. Péghaire, L. Pienkowski, D. Polster, S. Proschitzki, B. Quednau, H. Rossner, S. Schmid, and W. Schmid
Phys. Rev. Lett. 83, 4959 – Published 13 December 1999
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Abstract

Annihilation of 1.2 GeV antiprotons has been explored as a means to generate high thermal excitation in heavy nuclei (U, Au, Ho) and to observe their decay with a minimal contribution from dynamical distortion. Conventional fission and heavy residue formation are found to dominate the decay up to E*1000MeV. Both modes are increasingly accompanied by a modest emission of intermediate-mass fragments (up to 1 on average), but true multifragmentation is not observed. These features are in agreement with the predictions of the statistical model with no need for a fission delay τf>0.5×1021s.

  • Received 23 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4959

©1999 American Physical Society

Authors & Affiliations

U. Jahnke1,3, W. Bohne1, T. von Egidy2, P. Figuera1, J. Galin3, F. Goldenbaum1, D. Hilscher1, J. Jastrzebski4, B. Lott3, M. Morjean3, G. Pausch5, A. Péghaire3, L. Pienkowski4, D. Polster1, S. Proschitzki6, B. Quednau3, H. Rossner1, S. Schmid2, and W. Schmid2

  • 1Hahn-Meitner-Institut Berlin, Glienickerstrasse 100, D-14109 Berlin, Germany
  • 2Technische Universiät München, D-85748 Garching, Germany
  • 3GANIL(IN2P3-CNRS,DSM-CEA), BP 5027, F-14076 Caen Cedex 05, France
  • 4Heavy Ion Laboratory, Warsaw University, 02-093 Warszawa, Poland
  • 5FZ-Rossendorf, D-01314 Dresden, Germany
  • 6IPN Orsay, BP 1, F-91406 Orsay Cedex, France

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Vol. 83, Iss. 24 — 13 December 1999

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