Physics of Atomic Nuclei

, Volume 70, Issue 8, pp 1407–1414 | Cite as

Direct neutron decay of the isoscalar giant dipole resonance

  • M. Hunyadi
  • A. M. van den Berg
  • B. Davids
  • M. N. Harakeh
  • M. A. de Huu
  • H. J. Wörtche
  • M. Csatlós
  • J. Gulyás
  • A. Krasznahorkay
  • D. Sohler
  • U. Garg
  • M. Fujiwara
  • N. Blasi
Nuclei Experiment

Abstract

The direct and statistical neutron decay of the isoscalar giant dipole resonance has been studied in 90Zr, 116Sn, and 208Pb using the (α, α’ n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence hole states of the Z, N − 1 nuclei were analyzed, and estimates for the branching ratios were determined. The observation of the nucleon-direct-decay channels helped to select giant-resonance strengths and suppress the underlying background and continuum, which led to an indication of the existence of a new mode with L = 2 character, presumably the overtone of the isoscalar giant quadrupole resonance.

PACS numbers

24.30.Cz 25.55.Ci 27.80.+w 

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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • M. Hunyadi
    • 1
    • 2
  • A. M. van den Berg
    • 1
  • B. Davids
    • 1
    • 3
  • M. N. Harakeh
    • 1
  • M. A. de Huu
    • 1
  • H. J. Wörtche
    • 1
  • M. Csatlós
    • 2
  • J. Gulyás
    • 2
  • A. Krasznahorkay
    • 2
  • D. Sohler
    • 2
  • U. Garg
    • 4
  • M. Fujiwara
    • 5
  • N. Blasi
    • 6
  1. 1.Kernfysisch Versneller InstituutUniversity of GroningenThe Netherlands
  2. 2.Institute of Nuclear Research of the Hungarian Academy of SciencesDebrecen
  3. 3.TRIUMFVancouverCanada
  4. 4.University of Notre DameUSA
  5. 5.Research Center for Nuclear PhysicsOsaka UniversityJapan
  6. 6.INFNMilanoItaly

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