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Gamma-ray energies and relative intensities have been measured with a two-meter bent-crystal spectrometer using quartz (310) and germanium (400) crystals. Gamma rays from Eu^sz, Yb^^s and Eu^^s were studied. A pneumatic system was used to transport short-lived activities from a reactor to the focal circle of the spectrometer. Using the pneumatic system, the following gamma-ray energies, in keV, were measured: 104.320 ± 0.005, 141.411 ± 0.011, 245.727 ± 0.050; 89 . 847 ± 0.006; 121.775 ± 0.005; 442.91 ± 0.07, 526.62 ± 0.10. Measurement of the energies of the gamma rays following the decay of gave the following Hf^° level energies: 93.332 ± 0.006 (2^), 308.583 ± 0.04 (4"^), 640. 89 ± 0.04 (6*), 1084.07 ± 0.06 (B"*") , 1141.62 ± 0.07 (8 ). The energies of the ground-state rota­ tional band were compared with the predictions of several models. The gamma-ray energies and relative intensities, in parentheses, measured following Yb^^^ beta decay to Lu^^^ were: 113.803 ± 0.004, (29.0 ± 0.05); 137.656 ± 0.006, (1.56 ± 0.19); 144.861 ± 0.005, (5.20 ± 0.35); 251.470 ± 0.017, (1.37 ± 0.13); 282.517 ± 0.014, (46.5 ± 1.5); 396.322 ± 0.020, (100 ± 2.1). From these relative intensities and a measured value of 59.4 ± 1.6 for the Lu K x-ray relative intensity, the K-shell internal conversion coefficient for the 113.8-keV transition was

Measurements of gamma rays and x-rays with a bent-crystal spectrometer