No abstract available

[en] Published in summary form only

[en] Published in summary form only

[en] A novel capillary optics technique for focusing synchrotron X-ray beams has been applied in an experiment performed at the DORIS storage ring at HASYLAB. This new technqiue, which utilizes the total reflection properties of X-rays inside small capillaries, has recently been applied to generate microbeams of X-rays, with a beam size down to about 10 μm using conventional X-ray tubes. The result from our recent experiment shows that capillary optics can also be used to generate a submicron beam of X-rays from a synchrotron light source. A description of the capillary unit, and the alignment procedure is given. The influence of the thermal load on the device caused by the intense flux of synchrotron radiation will be discussed. Future perspectives of the capillary techniques as applied to synchrotron radiation will be discussed. (orig.)

[en] Binary fission induced by 140 MeV α particles has been measured for ^natAg, ¹³⁹La, ¹⁶⁵Ho, and ¹⁹⁷Au targets. The measured quantities are the total kinetic energies, fragment masses, and fission cross sections. The results are compared with other data and systematics. A minimum of the fission probability in the vicinity Z²/A=24 is observed.

[en] A series of chemical analyses of two interplanetary dust particles (IDPs), SP85 and SP87, has been performed with a proton (PIXE)- and a synchrotron-radiation (SYRFA)-microprobe. The quantitative results have been discussed with respect to sample heating and atmospheric contamination. Eleven more samples from the stratospheric collection have been analysed with PIXE and SYRFA. SYRFA appears to be a suitable tool for multielement analyses in the micro range with the advantage of much less irradiation time compared to PIXE. (orig.)