[en] The reasons for constructing large arrays of Compton-suppressed germanium detectors are discussed and a description is given of the Berkeley array, presently under construction. Preliminary results from the Berkeley system are given for the nucleus sup(156)Er. A transition is seen, around spin 30, from collective rotational behaviour to non-collective single-particle behaviour. The transition depends on configuration, as well as spin. (author)

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[en] The use of Iatroscan thin-layer chromatography (TLC)/flame ionization detector (FID) system to perform quantitative gas compositional analysis of oil samples was demonstrated. Results of the field experiment at Parker's Cove, an estuarine wetland east of Houston, Texas, showed significant biodegradation, as evidenced by initially rapid decrease in the compositional saturate and aromatic fractions coinciding with an increasing resin fraction. Details of the results were described, confirming that the Iatroscan TLC/FID system can be an effective tool for monitoring and measuring environmental processes. 10 refs., 5 figs

[en] Level schemes of the very neutron-deficient isotopes ¹⁵⁸Hf and ¹⁶²W have been identified, and that for ¹⁶⁴W extended. Alignment of the H_9/2 neutrons is suggested. (author). 12 refs., 7 figs

[en] This work has confirmed and extended the level scheme of ¹⁶⁴W using the ¹⁰⁹ Ag(⁵⁸Ni,p2n) reaction and identified for the first time levels in ¹⁵⁸Hf (N=86) and ¹⁶²W (N=88) using, respectively, ¹⁰⁷ Ag(⁵⁸Ni,p2n)¹⁶²W and ¹⁰⁷ Ag(⁵⁴Fe,p2n)¹⁵⁸Hf reactions. As a by-product, level schemes were also obtained for ¹⁶³W and ¹⁵⁹Hf, the latter being observed in two of the bombardments. The bulk of the measurements were carried out using 253 MeV,⁵⁸Ni and 233 MeV, ⁵⁴Fe beams from the 88-inch cyclotron (in combination with the ECR source) at the Lawrence Berkeley Laboratory. Gamma-rays were observed in the 21-detector array, HERA. Additional measurements were carried out, and are still in progress at the ANU, 14 UD Pelletron facility. The alignment gain in the yrast band of ¹⁶²W is proposed to be due to the h²_9/2 neutrons consistent in frequency and alignment with the CSM calculations. No regularity is discernible in the side-band sequences, assumed to be of negative parity, in either ¹⁶²W or ¹⁵⁸Hf, but further analysis is necessary to confirm the spin assignments. 12 refs., 7 figs

[en] We present a semi-classical analysis of the B(M1) and B(E2) transition probabilities in the shears bands in ^193-199Pb as a function of the shears angle. This provides a semi-empirical confirmation of the shears mechanism proposed by S. Frauendorf using the Tilted-Axis-Cranking model. We interpret this as a consequence of a residual interaction between the proton and neutron blades, and it is shown that the main ingredient of this effective force can be described by a P₂(θ) term with a strength of 400-600 keV. Such an interaction can be mediated through the core by particle-vibration coupling. The competition between the shears and the rotation of the core is investigated within the framework of a classical solution of two particles-plus-rotor model

[en] We have studied the unresolved γ-ray spectrum of three ytterbium nuclei produced in heavy-ion fusion reactions and measured the two damping widths, Γ_μ, the spreading (compound-damping) width, and Γ_rot, the rotational damping width, together with P_nar, the probability that the population enters and leaves a given state via the same component of the wave function. Our results for Γ_μ and Γ_rot are in good agreement with theoretical expectations, as well as with those of other groups using different methods. Our results for P_nar lead to a new method for quantitative evaluation of the full order-to-chaos transition in these Yb nuclei. Finally, we provide the first evidence for the motional narrowing of Γ_rot in nuclei. The basic physics occurring in this region is level mixing, which our simulation technique reproduces surprisingly well