[en] Activation analysis using charged particles is an interesting complement to the more established methods, especially for the determination of oxygen and other light elements. This article discusses analysis by irradiation in cyclotron beams (protons, deuterons, alpha particles or helium 3 particles) which is especially interesting for light elements (beryllium, boron, carbon, nitrogen, oxygen, fluorine) since these cannot be determined by neutron irradiation in a reactor. The sensitivity can be to below 1 nanogram, corresponding to concentrations of 0.001 ppm. The method can also with advantage be used as a supplement to traditional neutron activation analysis for a number of heavier elements. (JIW)

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[en] Examples are presented of the use of cyclotron beams in activation analysis. These are the determination of oxygen in silicon using 14 MeV helium 3 beams and a large number of trace elements in tantalum using 10 MeV protons. The direct analysis by measuring characteristic radiation produced in the primary nuclear reaction is also discussed, the examples being multielement analysis in biological materials using the elastic scattering of 22 MeV alpha particles, and the determination of hydrogen in thin foils by the elastic scattering of 17 MeV protons. (JIW)

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[en] An experiment at the CERN synchro-cyclotron on nuclear fission in muonic atoms (see the contribution by G. Tibell to this conference) has recently been extended to include a search for nuclear excitations other than those leading to fission, induced by the decay of a muon orbiting in one of the innermost shells. (Auth)

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[en] Total beta decay energies have been determined for isotopes of alkali and alkaline-earth elements. After a brief description of the experimental technique and results of the measurements, the discussion concentrates on masses of Rb and Kr near N = Z and their relevance for the Wigner symmetry term in nuclear mass calculations

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[en] Experiments at the reconstructed on-line isotope separator facility ISOLDE-2 at the CERN MeV synchro-cyclotron are now in progress. Over the past year the extracted proton beam has been raised to 1.3 μA, and the design value of 5μA is now within reach. The target and ion-source technology developed before the reconstruction has been further improved so as to permit the utilization of the high-proton-beam intensities and to increase the range of elements available for study to 30. With a proton beam intensity of 0.7 μA the radioactive Cs⁺ beams after mass separation have increased by a factor of 300 and in the most favoured cases, are exceeding 6nA. This permits the visualization of the separated radioactive ion beams by means of the usual beam scanners. A new target concept, a finely divided metal powder at ultra-high temperatures, features a short delay component which enhances the yield of very short-lived products. In the case of a niobium powder target at 2200⁰C for the production Rb, the new N=Z nuclide ⁷⁴Rb(Tsub(1/2)=59ms) could be identified with a collection rate of 450 atoms per second. The new beam optical system supplies four measuring stations simultaneously and allows up to ten groups to take data during an ISOLDE run (typically 100 h). The over-all performance and the stability of this system are perhaps best illustrated with the on-line spin measurements: about 20 new spins in isotopes of Rb, Cs, and Au have been measured by means of an atomic beam magnetic resonance (ABMR) apparatus. This Gothenburg-Uppsala experiment requires the ion beam to be directed onto its oven and kept steady within an area of 0.5 mm². (Auth.)