A. C. Mueller

LISE 3: a magnetic spectrometer—Wien filter combination for secondary radioactive beam production

Abstract The doubly achromatic spectrometer LISE installed at GANIL has been running since six years for the study of exotic nuclei and the production of secondary beams obtained by the interaction of high energy heavy ions (E/A i) The angle of entry of the primary beam with respect to the axis of the spectrometer has been made variable (0° to 3.5°). This allows the suppression of remaining incompletely stripped beam-charge-states in experiments with heavy beams (Z > 30). ii) A velocity filter based on an electrostatic field crossed with a magnetic one has been installed. This filter provides a third selection which is powerful in suppressing contaminants. Furthermore, the flight path between the target and the final focus is now increased to 43 m, which allows easy time-of-flight measurements also for heavy species. LISE 3 provides separated secondary beams of increased intensity and isotopic purity. We shall review the essential properties and present some recent experimental results for illustration.

Three-body correlations in Borromean halo nuclei

Three-body correlations in the dissociation of Borromean halo nuclei are explored for the first time using a technique based on intensity interferometry and Dalitz plots. As an example, the breakup of

Production of and studies with secondary radioactive ion beams at LISE

^{14}

Exclusive and restricted-inclusive reactions involving the 11Be one-neutron halo

Be into

Longitudinal and transverse momentum distributions of 9Li fragments from break-up of 11Li

^{12}

Longitudinal momenta and production cross-sections of isotopes formed by fragmentation of a 500 A×MeV86Kr beam

Be+n+n by Pb and C targets is analysed. The combined treatment of n-n and core-n correlations permitted the halo n-n separation to be deduced together with the characteristics

New neutron-rich isotopes in the scandium-to-nickel region, produced by fragmentation of a 500 MeV/u86Kr beam

(E,tau)

First beta-decay studies of the neutron-rich isotopes 53–55Sc and 56–59V

of resonances formed in

Neutron Momentum Distributions from Core Break-up Reactions of Halo Nuclei

^{13}

Production of nuclei in 32,34,36S-induced reactions in the energy range 6–75 MeV/A

Be.