Calcium-free Solid Solutions in the System Ba<Subscript>7</Subscript>F<Subscript>12</Subscript>Cl<Subscript>2−x</Subscript>Br<Subscript>x</Subscript> (x < 1.5), a Single-component White Phosphor Host

We have recently prepared solid solutions of Ba_～6.3Ca_～0.7F₁₂Cl_2?xBr_x with x ranging from 0 to 2. In this work, the synthesis and single crystal X-ray structure of calcium-free crystals of Ba_～6.9Na_～0.2F₁₂Br_0.6Cl_1.4 (space group P6₃/m, a = 10.6024(10), c = 4.2034(4) Å), Ba_～6.9Na_～0.2F₁₂Br_1.4 Cl_0.6 (space group P6₃/m, a = 10.6155(9), c = 4.2355(4) Å) and Ba_～6.9Na_～0.2Br_1.32Cl_0.68F₁₂ (space group P6₃/m, a = 10.6218(9), c = 4.2284(4) Å) are reported.These crystals systematically present additional electron density at the 0 0 0.25 position which is associated with the presence of small, but significant amounts of Na⁺ ions in the crystal.     

Single-step link of the superdeformed band in 143Eu

A discrete γ-ray transition with an energy of 3360.6 keV deexciting the second lowest SD state in ¹⁴³ Eu has been discovered. It carries 3.2 % of the full intensity of the band and feeds into a nearly spherical state which is above the I = 35/2⁽⁺⁾, E_x=4947 keV level. The exact placement of the single-step link is, however, not established due to the specially complicated level scheme in the region of interest. The energy of the single-step link agrees well with the previously determined two-step links.     

Decay of the compound nucleus 74Kr formed in the reaction 16O + 58Ni

Gamma-ray and charged-particle emission has been studied after bombardment of ⁵⁸Ni with ¹⁶O at energies from 44.5–76.5 MeV. The excitation functions for various reaction channels have been measured. The locus in energy and spin of maximum cross section (the entry line) of the γ-emitting region in the 2pγ and 3pγ channels have been studied through measurement of γ-ray multiplicity, average particle energy and average γ-ray energy. The standard deviations in both energy and spin of the distributions of cross section are presented. Statistical model calculations including shell corrections in the level density show very satisfactory agreement with the experimental results. The moment of inertia at high spin and excitation energy is deduced from the measured entry line.     

The systematics of h112 proton alignment in 157, 158, 159Er

Rotational bands have been observed in ^{157, 158, 159}Er to very high spin ($\text{J ～ 41}\text{h}\text{?}$). Upbends are found, due to the alignment of two h_{$\text{11}\text{2}$} protons at $\text{0.40 ?}\text{h}\text{?}\text{ω ? 0.46}\text{MeV}$ in all bands. A systematic shift with neutron number of the band-crossing frequency is observed and is related to a change in quadrupole deformation ?₂.     

Zur Untersuchung des Trinkwassers

Ohne Zusammenfassung     

Compound and rotational damping in warm deformed rare-earth nuclei

The gamma decay in the quasicontinuum from selected configurations of the rotational nucleus 163Er has been measured with the EUROBALL array. A new analysis technique has allowed for the first time to directly measure the compound and rotational damping widths Gamma (micro) and Gamma (rot). Values of Gamma (micro) approximately 20 keV and Gamma (rot) approximately 200 keV are obtained in the spin region I approximately 30-40 variant Planck's over 2pi, in good agreement with microscopic cranked shell model calculations. A dependence of Gamma (micro) and Gamma (rot) on the K-quantum number of the nuclear states is also presented.     

Evidence for wobbling excitation in 161Lu

High-spin states in ¹⁶¹Lu were investigated using the EUROBALL spectrometer. A previously known triaxial superdeformed band has been extended to higher spins and a new band with similar characteristics has been discovered. Comparison to systematically occurring wobbling bands in Lu isotopes strongly suggests that these two bands represent the n_w = 0 and 1 wobbling excitations in ¹⁶¹Lu.