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States built on the 9/2+ isomers in 91, 93Y

  • N. Fotiades
  • J. A. Cizewski
  • R. Krücken
  • R. M. Clark
  • P. Fallon
  • I. Y. Lee
  • A. O. Macchiavelli
  • W. Younes
Regular Article - Experimental Physics

Abstract

The isotopes 91, 93Y are located close to 90Zr , a nucleus that has a neutron shell closure (N = 50 and a proton subshell closure (Z = 40 , and close to the stability line. However, relatively little is known about excitations above their 9/2+ isomers. In the present work the isotopes 91, 93Y have been studied in the fission of compound systems formed in two heavy-ion-induced reactions using the Gammasphere array for \( \gamma\) -ray spectroscopy. States with excitation energies up to 6.9 and 7.1MeV above the previously known 9/2+ isomers of 91, 93Y were established, respectively. The coupling of a proton-hole occupying the \(\ensuremath g_{9/2}\) orbital to the yrast states in the core nuclei of 90Sr and 92Zr can account for the first excited states of 91Y . A comparison with the first excited states in the neighboring N = 52 , 54 isotopes is also considered. The experimental results are compared to predictions from previously reported shell-model calculations. The present results enhance previous knowledge on 91, 93Y from fusion-evaporation reactions and multinucleon transfer reactions, and highlight the roles of these complementary reactions in probing moderate spin excitations in this mass region.

Keywords

Level Scheme Yrast State Neutron Shell Closure Subshell Closure Multinucleon Transfer Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • N. Fotiades
    • 1
  • J. A. Cizewski
    • 2
  • R. Krücken
    • 3
    • 4
  • R. M. Clark
    • 5
  • P. Fallon
    • 5
  • I. Y. Lee
    • 5
  • A. O. Macchiavelli
    • 5
  • W. Younes
    • 6
  1. 1.Los Alamos National LaboratoryLos AlamosUSA
  2. 2.Department of Physics and AstronomyRutgers UniversityNew BrunswickUSA
  3. 3.Physik Department E12Technische Universität MünchenGarchingGermany
  4. 4.TRIUMFVancouverCanada
  5. 5.Nuclear Science DivisionLawrence Berkeley National LaboratoryBerkeleyUSA
  6. 6.Lawrence Livermore National LaboratoryLivermoreUSA

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