acta physica slovaca

b>Acta Physica Slovaca 51(2001)
  • Singh, N. L., Gadkari, M. S.
    Preequilibrium decay in alpha particle induced reactions in Terbium
    Acta Physica Slovaca 51, 271 (2001)

    Abstract: The excitation functions of 159Tb(,n), (,3n), (,4n), (,3n) reactions were measured using stacked foil activation technique and HPGe gamma ray spectroscopy method up to 50 MeV. The experimental results were compared with the theoretical predictions considering equilibrium as well as preequilibrium contributions using code ALICE/90. It was found that the initial exciton configuration n0 = 4(4p0h) that is pure particle state, appears to give good fit to the experimental data.

  • Valko, L., Hurta, F., Valko, M., Sláma, J., Košturiak, A.
    Binuclear Iron Fe(II) 3-semicarbazone-2,3 dioxoindole complexes as potential organic ferromagnets
    Acta Physica Slovaca 51, 281 (2001)

    Abstract: The temperature dependence (220 - 470 K) of the magnetic susceptibility is reported for the organometallic molecular ferromagnet-chelates of the dinucleating Fe(II) 3-semicarbazone-2,3 dioxoindole ligand. An average antiferromagnetic exchange is present in the dinuclear Fe(II) chelates and is characterised by the coupling constant J=-44.1 x 10-4 eV and g=2.08, where the spin-coupling Hamiltonian is taken as H=-2J S1.S2 for Fe(II) centres; the susceptibility studies agree and fit with this result. This study verifies the existence of 3-semicarbazone-2,3 dioxoindole-bridged di-iron(II) centres. The temperature dependence of magnetic moment is illustrated.

  • Boutaleb, H., Chafik, A., Marrakchi, A. L.
    Supersymmetric two-stage inflation
    Acta Physica Slovaca 51, 289 (2001)

    Abstract: We investigate a supersymmetric extension of the hybrid potential with the mass-term replaced by a self-coupling quartic one. This gives a scenario with two disconnected stages of inflation. The first is a usual chaotic inflation, while the second is a vacuum-dominated one. However, in this model the latter stage requires a fine-tuning of the self-coupling constant in order to occur and to generate the density perturbations.

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