Energy Spectra of Λ9Be
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.
KeywordsPartial Wave Positive Parity Coulomb Repulsion Negative Parity Faddeev Equation
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