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Production of neutron-rich isotopes in fission of uranium induced by neutrons of 20 MeV average energy

  • G. Lhersonneau
  • P. Dendooven
  • G. Canchel
  • J. Huikari
  • P. Jardin
  • A. Jokinen
  • V. Kolhinen
  • C. Lau
  • L. Lebreton
  • A.C. Mueller
  • A. Nieminen
  • S. Nummela
  • H. Penttilä
  • K. Peräjärvi
  • Z. Radivojevic
  • V. Rubchenya
  • M.-G. Saint-Laurent
  • W.H. Trzaska
  • D. Vakhtin
  • J. Vervier
  • A.C.C. Villari
  • J.C. Wang
  • J. Äystö

Abstract:

In the context of a parameter study conducted by several laboratories for future European radioactive beam facilities based on fast-neutron induced fission, in particular for the SPIRAL-II project at GANIL, we have measured the yields of neutron-rich isotopes in the mass range of 88 to 144. These nuclei were obtained as fission products of natural uranium bombarded by neutrons of 20 MeV average energy emitted by a thick carbon target irradiated by 50 MeV deuterons. Yields have been measured using on-line mass separation with the ion-guide method. Compared with proton-induced fission at 25 MeV the magnitude of cross-sections, except for the symmetric region, is similar. Z-distributions of isobars have the same width, 0.7 charge units, but their maxima are shifted by about 0.8 charge units, favouring production of the neutron-richer isobars. Our data allow calculations of absolute cross-sections for fission of natural uranium induced by neutrons of about 20 MeV.

PACS. 24.75.+i General properties of fission – 25.85.Ec Neutron-induced fisssion – 25.85.Ge Charged-particle induced fission 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2000

Authors and Affiliations

  • G. Lhersonneau
    • 1
  • P. Dendooven
    • 1
  • G. Canchel
    • 1
  • J. Huikari
    • 1
  • P. Jardin
    • 3
  • A. Jokinen
    • 1
  • V. Kolhinen
    • 1
  • C. Lau
    • 4
  • L. Lebreton
    • 2
  • A.C. Mueller
    • 4
  • A. Nieminen
    • 1
  • S. Nummela
    • 1
  • H. Penttilä
    • 1
  • K. Peräjärvi
    • 1
  • Z. Radivojevic
    • 1
  • V. Rubchenya
    • 1
  • M.-G. Saint-Laurent
    • 3
  • W.H. Trzaska
    • 1
  • D. Vakhtin
    • 5
  • J. Vervier
    • 2
  • A.C.C. Villari
    • 3
  • J.C. Wang
    • 1
  • J. Äystö
    • 1
  1. 1.Department of Physics, University of Jyväskylä, POB 35, 40351-Jyväskylä, FinlandFI
  2. 2.Centre de Recherches du Cyclotron, 2 chemin du cyclotron, B-1348-Louvain-La-Neuve, BelgiumBE
  3. 3.GANIL, BP 5027, F-14076 Caen, FranceFR
  4. 4.Institut de Physique Nucléaire, F-91406 Orsay, FranceFR
  5. 5.Khlopin Radium Institute, St. Peterburg, RussiaRU

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