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Within an extended Skyrme soliton model for baryons the interplay between thecollective radial motion and the SU(3)--flavor--rotations is investigated. Thecoupling between these modes is mediated by flavor symmetry breaking.Collective coordinates which describe the corresponding large amplitudefluctuations are introduced and treated canonically. When diagonalizing theresulting Hamiltonian flavor symmetry breaking is fully taken intoconsideration. As eigenstates not only the low--lying ${1/2}^+$ and ${3/2}^+$baryons but also their radial excitations are obtained and compared to theempirical data. In particular the relevance of radial excitations for thepenta--quark baryon $Z^+$ (Y=2, I=0, $J^\pi={1/2}^+$) is discussed. In thisapproach its mass is predicted to be $1.58{\rm GeV}$. Furthermore the widthsfor various hadronic decays are estimated which, for example, yields$\Gamma(Z^+\to NK)\sim 100{\rm MeV}$ for the only permissible decay process ofthe $Z^+$.Comment: 21 pages, 9 (e)ps-f, to be published in Euro. Phys. J.

Radial excitations of low–lying baryons and the Z + penta–quark