Energy Spectra of Λ9Be

  • E. Cravo
  • A. C. Fonseca
  • Y. Koike
Conference paper
Part of the Few-Body Systems book series (FEWBODY, volume 14)


The hypernucleus Λ 9 Be is investigated using the α + Λ + α cluster model. The corresponding Faddeev equations are solved for different α − α and Λ − α interactions that describe both 8Be and Λ 5 He energy spectra. For the ground state Jπ = 1/2+ and excited states 3/2+ and 5/2+ we include the Coulomb repulsion between the α’s and calculate, in addition to the energy eigenvalues, the α− and Λ−particle mean radius, the rms charge radius, the electric quadrupole moment (Q), as well as the magnetic dipole. Structural differences between 9Be and Λ 9 Be lead to values of Q and μ that have opposite sign. Unlike previous theoretical work we find only two degenerate negative parity resonances 1/2 (3/2) but, in addition, we get two degenerate positive parity resonances with Jπ = 7/2+ (9/2+) at higher energy which, together with the bound states, complete the positive parity rotational band.


Partial Wave Positive Parity Coulomb Repulsion Negative Parity Faddeev Equation 
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Copyright information

© Springer-Verlag/Wien 2003

Authors and Affiliations

  • E. Cravo
    • 1
  • A. C. Fonseca
    • 1
  • Y. Koike
    • 2
  1. 1.Centro de Física NuclearUniversity of LisbonLisbonPortugal
  2. 2.Science Research CenterHosei UniversityChiyoda-ku, TokyoJapan

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