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Energy Spectra of 9ΛBe

  • E. Cravo
  • A. C. Fonseca
  • Y. Koike
Conference paper
Part of the Few-Body Systems book series (FEWBODY, volume 15)

Abstract

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 Inline Equation
$${J^\pi } = {\frac{1}{2}^ + }$$
and excited states Inline Equation
$${\frac{3}{2}^ + }and{\frac{5}{2}^ + }$$
we include the Coulomb repulsion between the a’s and calculate, in addition to the energy eigenvalues, the a¡ª and A¡ªparticle 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,u that have opposite sign. Unlike previous theoretical work we find only two degenerate negative parity resonances Inline Equation
$${\tfrac{1}{2}^ - }({\tfrac{3}{2}^ - })$$
but, in addition, we get two degenerate positive parity resonances with Inline Equation
$${J^\pi } = {\frac{7}{2}^ + }\left( {{{\frac{9}{2}}^ + }} \right)$$
at higher energy which, together with the bound states, complete the positive parity rotational band.

Keywords

Quadrupole Moment Coulomb Repulsion Negative Parity Faddeev Equation Electric Quadrupole Moment 
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

© Springer-Verlag 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 UniversityTokyo 102Japan

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