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Gamma and conversion electron radiations following the decay of 1.7 s 123mC~ and 5.9 min lZsCs have been studied in singles and coincidence with mass-separated sources at the ISOLDE facility. Evidence for a 61.7 keV E3 transition, de-exciting the yisomeric state of I2ks, has been found. A scheme for the 123Cs ground-state decay including 11 new low-spin levels has been constructed. Log ff values have been calculated; limits on possible spins are deduced which invalidate in particular the previous J = { assignment for the 180.6 keV level in '"Xe. The results are discussed in the frame of odd-mass neutrondeficient Cs and Xe systematics. RADIOACTIVITY 123mC~, 123Cs (from La(p, 3p14n)), E,= 600 MeV, on-line massseparated sources; measured T1/2, E,, I,, E,, I,, yy coin, y ce coin; L23Cs, L23Xe; deduced levels, J , n, log fl. Ge(Li), Si(Li) and plastic detectors.

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Co overtone laser pulses with energy up to 4.4 J and efficiency up to 1 % with completely suppressed lasing in the fundamental band were obtained from mixtures CO:N2 excited by e-beam sustained discharge with duration 1.5 ps. A comprehensive model of this laser was formulated. The results of numerical simulations satisfactorily correlate with experiments. The conditions for obtaining efficiency as high as 20% are predicted.

The intercomparison is the best tool for the evaluation of the quality of a standard, and the validity of the estimation of its uncertainty. It is also the only way to detect possible systematic errors, experimental errors, missing items in the uncertainty budget or mistakes in calculation. Since 1975, many intercomparisons have been organized in the whole pressure range, all over the world. It would be a very large and difficult task to list them. Only the most significant are given as examples. The most recent are presented in other papers at this seminar. A review of the most commonly used transfer standards and their characteristics is given. The more significant data obtained from the intercomparisons (technical data and direct exchanges) are analysed.