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Title: Fission studies of secondary beams from relativistic uranium projectiles: The proton even-odd effect in fission fragment charge yields

Abstract

Nuclear-charge yields of fragments produced by fission of neutron-deficient isotopes of uranium, protactinium, actinium, and radium have been measured. These radioactive isotopes were produced as secondary beams, and electromagnetic fission was induced in a lead target with an average excitation energy around 11 MeV. The local even-odd effect in symmetric and in asymmetric fission of thorium isotopes is found to be independent of Z{sup 2}/A. The charge yields of the fission fragments of the odd-Z fissioning protactinium and actinium show a pronounced even-odd effect. In asymmetric fission the unpaired proton predominantly sticks to the heavy fragment. A statistical model based on the single-particle level density at the Fermi energy is able to reproduce the overall trend of the local even-odd effects both in even-Z and odd-Z fissioning systems.

Authors:
; ; ;  [1]; ; ; ; ; ; ;  [2];  [3]
  1. GSI Darmstadt, Planckstrsse 1, D-64291 Darmstadt (Germany)
  2. Institut fuer Kernphysik, Technische Universitaet Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt (Germany)
  3. Institute of Experimental Physics, University of Warsaw, Ul Hoza 69, 00-381 Warszawa (Poland)
Publication Date:
OSTI Identifier:
21208230
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 481; Journal Issue: 1; Conference: Nuclear structure 98 conference, Gatlinburg, TN (United States), 10-15 Aug 1998; Other Information: DOI: 10.1063/1.59517; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; ENERGY-LEVEL DENSITY; EXCITATION; FISSION; FISSION FRAGMENTS; FISSION YIELD; ION BEAMS; MASS SPECTRA; MEV RANGE; NEUTRON-DEFICIENT ISOTOPES; NUCLEAR STRUCTURE; RADIUM ISOTOPES; SINGLE-PARTICLE MODEL; STATISTICAL MODELS; THORIUM ISOTOPES; URANIUM ISOTOPES

Citation Formats

Junghans, A. R., Benlliure, J., Schmidt, K.-H., Voss, B., Boeckstiegel, C., Clerc, H.-G., Grewe, A., Heinz, A., Jong, M. de, Mueller, J., Steinhaeuser, S., and Pfuetzner, M. Fission studies of secondary beams from relativistic uranium projectiles: The proton even-odd effect in fission fragment charge yields. United States: N. p., 1999. Web. doi:10.1063/1.59517.
Junghans, A. R., Benlliure, J., Schmidt, K.-H., Voss, B., Boeckstiegel, C., Clerc, H.-G., Grewe, A., Heinz, A., Jong, M. de, Mueller, J., Steinhaeuser, S., & Pfuetzner, M. Fission studies of secondary beams from relativistic uranium projectiles: The proton even-odd effect in fission fragment charge yields. United States. doi:10.1063/1.59517.
Junghans, A. R., Benlliure, J., Schmidt, K.-H., Voss, B., Boeckstiegel, C., Clerc, H.-G., Grewe, A., Heinz, A., Jong, M. de, Mueller, J., Steinhaeuser, S., and Pfuetzner, M. Thu . "Fission studies of secondary beams from relativistic uranium projectiles: The proton even-odd effect in fission fragment charge yields". United States. doi:10.1063/1.59517.
@article{osti_21208230,
title = {Fission studies of secondary beams from relativistic uranium projectiles: The proton even-odd effect in fission fragment charge yields},
author = {Junghans, A. R. and Benlliure, J. and Schmidt, K.-H. and Voss, B. and Boeckstiegel, C. and Clerc, H.-G. and Grewe, A. and Heinz, A. and Jong, M. de and Mueller, J. and Steinhaeuser, S. and Pfuetzner, M.},
abstractNote = {Nuclear-charge yields of fragments produced by fission of neutron-deficient isotopes of uranium, protactinium, actinium, and radium have been measured. These radioactive isotopes were produced as secondary beams, and electromagnetic fission was induced in a lead target with an average excitation energy around 11 MeV. The local even-odd effect in symmetric and in asymmetric fission of thorium isotopes is found to be independent of Z{sup 2}/A. The charge yields of the fission fragments of the odd-Z fissioning protactinium and actinium show a pronounced even-odd effect. In asymmetric fission the unpaired proton predominantly sticks to the heavy fragment. A statistical model based on the single-particle level density at the Fermi energy is able to reproduce the overall trend of the local even-odd effects both in even-Z and odd-Z fissioning systems.},
doi = {10.1063/1.59517},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 481,
place = {United States},
year = {1999},
month = {9}
}