[en] Low energy radioactive ion beams are produced at the Leuven Isotope Separator On Line (LISOL) facility in Louvain-la-Neuve. The beams are used for standard nuclear spectroscopy studies and for Nuclear Orientation On Line measurements. A project to put a He-jet target system coupled with a single stage E.C.R. ion source on line with the mass separator will be presented. In september 1987 an other project was started to accelerate radioactive beams to higher energies. This will be done by coupling the two existing cyclotrons. A beam of ¹³N will be produced in the summer of this year

[en] The fine structure in the α decay of mass-separated ^194,196,198 Po is studied. Only feeding to the 0⁺ groundstate and the first excited 0⁺ intruder state in ^190,192,194Pb is observed. Out of the α-e-t coincidences between the feeding α and the EO transition, the half life of the 0⁺ intruder state in ^190,192,194Pb is measured. The mixing between the intruder- and groundstate is deduced

[en] Published in summary form only

[en] The fine structure in the α decay of mass-separated ^194,196,198Po is studied. Only feeding to the O⁺ groundstate and the first excited O⁺ intruder state in ^190,192,194Pb are observed. Out of the α-e-t coincidences between the feeding α and the EO transition, the half life of the O⁺ intruder state in ^190,192,194Pb is measured. The mixing between the intruder- and groundstate is deduced. (author)

[en] Published in summary form only

[en] In recent years, the LISOL group collected an extensive systematics on intruder states in the Pb region. In this contribution, we will give a summary of the results obtained on E0 lifetimes, Q_α and energy systematics of 0₂⁺ intruder states in ^190'192'194 Pb. (Author)

[en] The fine structure in the α-decay of mass-separated ^194,196,198Pd is studied. Feeding to the 0⁺ ground state and the first excited 0⁺ intruder state in ^190,192,194Pb is observed. From α-e-t coincidences between the feeding α-ray and the E0 transition, the half life of the 0⁺ intruder state in ^190,192,194Pb is measured. The mixing between intruder state and ground state is deduced. (orig.)

[en] Abstract only

[en] The α decay of mass separated ^194,196,198Po is studied. The half life of the first excited O⁺ state in ^190,192,194Pb was measured using α.e^-.t coincidences. The deduced monopole strength increases by almost one order of magnitude going from ¹⁹⁴Pb to ¹⁹⁰Pb and the deduced α-hindrance factors show a dependence on neutron number. (author)

[en] The α decay of mass-separated ²⁰²Rn is studied at the Isolde separator. Time sequential α-singles spectra together with α-X-t and α-e-t coincidence events are collected. Fine structure in the α decay is observed and feeding of a low-lying 0₂⁺ state at 816 keV in ¹⁹⁸Po is evidenced. This 0⁺ state can be interpreted as the bandhead of an intruder-state based deformed band, coexisting with the spherical groundstate band. Mixing between normal and intruder states is discussed. A preliminary α-decay study of ²⁰⁰Rn did not yet reveal any fine structure. (orig.)