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Abstract. Short lived Ru isotopes produced in thermal fission of 235U have been chemically separated from the other fission products. Successive y-ray spectra were taken by means of Ge(Li) detectors. The observed v-lines have been assigned to the various Ru isotopes (A = 107 to 110) or to their daughter elements on the basis of their half-lives, intensity ratios and known level properties. Partial decay schemes are discussed and relative fission yields are given, mRu has been identified (T1,2:1.5_+0.3 s).

Using monochromatic photons from (n, y) and (p, y) capture reactions, the elastic scattering of photons was studied in the mass range A =181-238 and energy range E =8-18 MeV. It is shown that the A dependence of the enhancement of El strength located in the giant-dipole resonance as revealed by part of the 'photoneutron cross sections is confirmed by our photon-scattering data. The possibility is discussed that the concentration of E1 strength in the giant dipole resonance may be larger for closed-shell nuclei as compared to open-shell nuclei.

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