[en] In on-line nuclear orientation experiments the relaxation process is of great importance. During implantation of the radioactive beam, the nuclear sublevel populations attain a secular equilibrium. For this case secular orientation parameters are introduced: B_λ(sec)=ρ_λB_λ(th). Previously attenuation coefficients ρ_λ have already been tabulated, but only for λ=2,4. In the last few years the number of nuclear orientation experiments in which β or α particles are studied has increased. For these experiments the terms with λ=1,3,6, and 8 are also necessary. Therefore, we have calculated the values of ρ_λ in full scope

[en] An overview is given of the present status of low-energy tests of the Standard Model in nuclear beta decay and neutron decay, covering the unitarity problem, searches for right-handed currents, scalar and tensor type currents, tests of time reversal violation, as well as experiments to set the neutrino mass scale. In view of the large amount of ongoing and planned experiments in this sector, many new results can be expected in the coming decade

[en] The authors report on the first results obtained with a system designed to polarize on-line mass-separated radioactive ion beams by scattering the beams from very flat single crystal surfaces at grazing incidence angles. Polarizations of 2% have been observed for deuterium. A comparison of this method with other in-beam polarization techniques is given

[en] An overview is given of the present status of low-energy tests of the Standard Model in nuclear beta-decay and neutron decay, covering the unitarity problem, searches for right-handed currents, scalar- and tensor-type currents, tests of time-reversal violation, as well as experiments to set the neutrino mass scale. In view of the large amount of ongoing and planned experiments in this sector, many new results can be expected in the coming decade. (orig.)

[en] An overview is given of the present status of parity violation tests in neutron decay and nuclear beta decay. Prospects for improved and new measurements are discussed as well.

[en] The low temperature nuclear orientation facility KOOL was used for a systematical study of the very neutron-deficient Au isotopes where the on-line technique is compulsory due to the short lifetimes involved. The measurement of the magnetic moment of the 4.6 min ¹⁸⁹Au 11/2^- isomer, a preliminary result on the same state in tsub(1/2) = 0.9 sec ¹⁹¹Au and the moment value of the tsub(1/2) = 10.7 min ¹⁸⁶Au 3^- ground state is reported. Several spins and mixing ratios in ¹⁸⁹Pt, ¹⁸⁶Pt and ¹⁹¹Au have been determined as well

[en] Published in summary form only

[en] The recent development of particle detection at low temperature (4K) has made it possible to study systematically for the first time anisotropic α particle emission in the decay of oriented nuclei. First experiments have been performed on Po, At, Rn and Fr isotopes, produced and separated on line and subsequently implanted and oriented at low temperatures. Very intriguing first results have been obtained. The immense attraction of α-detection in connection with oriented nuclei lies in the fact that the directionality of the α-emission and therefore the α-anisotropy, is connected with the shape of the emitting and daughter nuclei. These first experiments bring to light very interesting new aspects of the α-decay process. Furthermore, with the right source preparation, other exciting new experiments become possible now: measuring α-particle angular distributions of actinides (octupole deformations) and nuclei in the transuranium region to characterize the nuclear shapes

No abstract available

[en] The presence of isospin mixing into the ground state of ⁵²Mn was studied via anisotropic positron emission from nuclei. With this method the isospin forbidden Fermi-component in the Gamow-Teller dominated β decay was determined. It is shown that sample purity and the control of positron scattering is of vital importance. Comparison between theory and experiment shows that shell model calculations of the isospin mixing probability deviate by a factor three to seven from experiment. For more recent Hartree-Fock-RPA based calculations the difference is over two orders of magnitude