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Claes Fahlander

Professor emeritus

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Identification of Excited States in 61Ga: Mirror Nuclei in the Upper fp Shell

Author

  • Lise-Lotte Andersson
  • Emma Johansson
  • Jörgen Ekman
  • Dirk Rudolph
  • Rickard du Rietz
  • Claes Fahlander
  • CJ Gross
  • PA Hausladen
  • DC Radford
  • G Hammond

Summary, in English

In the fusion-evaporation reaction Ca-40+Mg-24 at 104 MeV beam energy, excited states have been observed for the first time in the isotope Ga-31(61)30. The experimental setup comprised the Ge array CLARION, a recoil mass spectrometer and, in its focal plane, an ionization chamber. Five transitions in Ga-61 are identified, out of which a cascade of three transitions has been established by means of recoil-gammagamma coincidences. The strong transitions at 271 keV in Ga-61 and 124 keV in Zn-61 are viewed as the "mirror" 5/2(-)-->3/2(-) ground-state transitions. The rather large energy difference of 150 keV is suggested to arise from Coulomb monopole contributions. Shell-model calculations support this interpretation.

Department/s

  • Nuclear physics

Publishing year

2005

Language

English

Publication/Series

Physical Review C (Nuclear Physics)

Volume

71

Issue

1

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

Project

  • A Trilogy of Mass A=61: Superdeformed Structures, Exotic Decay, and Isospin Symmetry

Research group

  • Nuclear Structure

ISBN/ISSN/Other

  • ISSN: 0556-2813