[en] The search for the beta-delayed fission in neutron-rich nuclei has been performed at the IRIS mass-separator. The delayed fission has not been observed: The limits of probabilities for 228, 230, 232 Fr and 232 Ac precursors have been obtained. The new isotopes 232 Fr, 233, 234 Ra have been identified. (orig.)

[en] For a quantum field theory with interacting scalar fields treated in light-cone quantisation (LCQ) it is shown that the vacuum of the theory is always the perturbative vacuum. The fields can be split up into classical constant fields, determined by minima of the effective action, and quantum fields. The former ones replace the nontrivial vacuum expectation values of the conventionally quantised theory. When spontaneous symmetry breaking occurs, the classical fields are only determined up to symmetry transformations. This degeneracy corresponds to the degeneracy of the vacuum in the conventional approach. The effective actions of the conventional theory and LCQ are identical. Light-cone charges obey the canonical commutation relations with the fields and the canonical charge algebra relations. Ward identities and the appearance of Goldstone Bosons accompanying spontaneous symmetry breaking can be derived in analogy to the conventional case. (orig.)

[en] A π-π and K-anti K coupled channel analysis of the isoscalar spin zero mesons is presented in the framework of the separable potential formalism. The π-π and K-anti K interactions have a very short range character. The f₀(975) meson can be treated as a bound Kanti K state; its root mean square radius is of the order of 1 fm. The f₀(975) coupling constant to the Kanti K system is rather large. (orig.)

[en] A level scheme has been established for ₃₇⁹⁴Rb₅₇ based on studies at the fission-product separator JOSEF of γ-γ coincidences following the β-decay of ⁹⁴Kr. For the 190.7 keV level a half-life of 2.5(8) ns has been determined through the centroid-shift method. The major β-decay branch of ⁹⁴Kr proceeds with log ft=3.7 into the 988.4 keV state in ⁹⁴Rb. This transition must be of the 0⁺→1⁺ GT type involving the transition νg_7/2→πg_9/2. IBFFM calculations have been performed for ⁹⁴Rb, starting from the parametrization used in the previous IBM investigations for the isotope ⁹³Rb and the isotone ⁹⁶Y. A theoretical interpretation of the low-lying levels including propositions for the spins is given in a comparison to the available data. (orig.)

[en] Lifetimes of excited states in ¹⁶⁴Hf were measured using the Doppler-shift recoil-distance method. Gamma-gamma coincidences at eleven target-stopper distances were measured using the twelve Compton-suppressed Ge-detectors of the OSIRIS spectrometer. From the coincidence spectra the intensities of the Doppler-shifted and unshifted γ-lines were determined. The quadrupole moments Q_t of transitions within the rotational bands derived from the lifetimes are constant within the experimental uncertainties up to the 18⁺ state. The Q_t value for the transition between the ground- and the neutron i²_13/2 band (s-band) which is strongly reduced compared to the values of the in-band transitions is used to deduce a band interaction energy of 34 keV≤V≤57 keV. (orig.)

[en] The T-violation effects in neutron-deuteron scattering caused by T-noninvariant P-even nucleon-nucleon interaction are discussed. (orig.)

[en] The decays of ^{113,114,115g,115m,116}Pd have been studied with an emphasis on the determinations of total decay energies and absolute γ-ray intensities. The experiments also provided improved data on these quantities for the decays of ^114,115g,^115m,116mAg. A search for isomeric transitions using a high resolution electron detector resulted in the identification of isomeric E3 transitions in ¹¹⁵Pd and ^{113,115,116,117}Ag. The isomeric branching was determined in all cases. The Q_β-values of ^113-116Pd and ^113-116Ag have been measured using a βγ-coincidence method. (orig.)

[en] High spin states of ^175,176Pt have been populated in ¹⁴⁴Sm(³⁵Cl, pxn) reactions at beam energies of 175-185 MeV. In-beam γ-ray spectroscopic techniques using the ESSA30 spectrometer array were adopted. Levels up to spin 26 in ¹⁷⁶Pt and tentatively up to spin 45/2 in ¹⁷⁵Pt have been identified. The data are interpreted within the framework of Cranked Shell model calculations using the deformed Woods-Saxon potential and including monopole pairing. (orig.)

[en] A phenomenological method is proposed to select possible Quark matter forming events in ultra-relativistic nucleus-nucleus interactions. We compare the released photonic and hadronic energies from a Quark matter forming event and from a normal Hadronic event and derive a relation, which may be used in an event-by-event analysis to differentiate the two phases. We determine thus two regions of QCD deconfinement. We also discuss the hadronic, photonic energy and multiplicity contents and the < P_T> of several exotic cosmic ray events at ultra high energies. On the basis of the phenomenological model, we suggest that the 'Centauro' type are Quark matter events near the projectile fragmentation region with very large baryochemical potential, μ_b. The 'Anti-Centauro' type events are created by vacuum excitation in the central region with near zero μ_b. (orig.)

[en] The ¹⁴⁶Nd(α,n) reaction combined with conventional in-beam spectroscopic methods has been used to study low-lying levels in ¹⁴⁹Sm. Several new levels and γ-ray transitions have been placed to the ¹⁴⁹Sm level scheme. Main features of levels below 1 MeV in ¹⁴⁹Sm have been reproduced in a quasiparticle-rotor model calculation. (orig.)