Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

Abstract : The isotopic distributions of fragments produced in the spallation. of uranium are strongly influenced by the fission of the excited prefragments, highly fissile nuclei. The competition between fission and evaporation around the doubly-magic nucleus Pb is discussed. The light fragments from Fe beam are produced with a strong enhancement of even-even nuclei compared to the odd-odd in the region of nuclei with equal number of neutrons and protons, N similar to Z. This staggering in the production of light fragments is not observed in the production of heavy fragments, and is in contradiction with the basis of the statistical model of deexcitation of a hot nucleus. Pairing interaction as a function of the excitation energy and as a function of the isospin of the nucleus are questioned.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00012413
Contributor : Suzanne Robert <>
Submitted on : Tuesday, January 14, 2003 - 11:44:03 AM
Last modification on : Thursday, January 11, 2018 - 6:12:36 AM

Identifiers

  • HAL Id : in2p3-00012413, version 1

Collections

Citation

F. Rejmund, A. Bethenod, P. Napolitani, J. Taieb, C. Villagrassa, et al.. Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies. Acta Physica Hungarica, 2002, 16, pp.85-91. ⟨in2p3-00012413⟩

Share

Metrics

Record views

113