[en] A new program studying the behavior of nuclear matter under very high excitation was begun at the Bevatron with experiments designed to study the gamma radiation emitted from central collisions of heavy ions. A system was partially completed that made use of a multiplicity detector as a signature of a central collision. The system was surrounded by gamma detectors for both the nuclear and high-energy range; such an arrangement yielded a very large acceptance. A preliminary experiment showed the feasibility of the system and gave the first results of correlations of gamma rays with such collisions. Some details of both the system and the preliminary results are described. Experiments on the measurement of nuclear moments from beta emission are reviewed, and the final results for the latest measurements on ⁹Li are given. Results of recent measurements on gamma polarization from high-spin states of ^105-109Cd are also presented. Studies of electrons resulting from heavy ion collisions using a special high-acceptance beta spectrometer are described. The preliminary results indicate the beginnings of effects that are complements of the so-called combined atom x-ray phenomena. A new program for the study of gamma rays and neutrons produced in the capture of pi meson of nuclei are described with some new results on the excitation of high-spin states. Finally, a reprint of a recent evaluation of some old data concerned with the conserved vector current theory is added

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[en] The isotope shift in the spark spectrum of dysprosium was studied by means of a photoelectric recording Fabry-Perot spectrometer with digital data output. For 29 lines the isotope shift of ¹⁶²Dy and ¹⁶⁴Dy was measured in order to check the mixing of the three configurations 4f⁹5d6s,4f⁹5d², and 4d¹⁰6p calculated by Wyart. By means of the sharing rule the configuration mixing could be confirmed as a whole. In the ground state configuration the influence of relativistic effects was demonstrated and explained by theory. The order of magnitude of crossed-second-order effects contributing to the isotope shift of 4f¹⁰6s⁶I and ⁴Icould be estimated. In three lines the isotope shift of all stable Dy isotopes was measured. Mass shift and field shift were separated by comparison with results obtained in the arc spectrum. (orig.)

[en] Magneto-optical traps (MOTs) of highly magnetic lanthanides open the door to explorations of novel phases of strongly correlated matter such as lattice supersolids and quantum liquid crystals. We recently reported the first MOTs of the five high-abundance isotopes of the most magnetic atom, dysprosium. Described here are details of the experimental technique employed for repumper-free Dy MOTs containing up to half a billion atoms. Extensive characterization of the MOTs' properties--population, temperature, loading, metastable decay dynamics, and trap dynamics--is provided.

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[en] The superdeformed bands in Tb and Dy isotopes are analyzed by using the kinematic moments of inertia formula J⁽¹⁾=2α + 4/3βω²+6/5γω⁴ in order to extract level spin. The results show that the calculated J⁽¹⁾ of 20 superdeformed bands are agreement excellently with that of extracted from expression ℎ²(2I - 1)/E_γ(I). With the parameters determined by J⁽¹⁾ fitting, the calculated values of dynamic moments of inertia J⁽²⁾ are also agreement with that of extracted from experiments. All of these show authors' assignment of the level spins is reliable. In particular, the spin of the lowest level of the first discovered high-spin SD band ¹⁵²Dy(1) predicted to be I₀=26 is more proper

[en] Currently, thirty-one dysprosium, thirty-two holmium, thirty-two erbium, thirty-three thulium, and thirty-one ytterbium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented

[en] The isotope effect on the internal mobility of the dysprosium ion in molten dysprosium chloride has been measured from 973 to 1,073 K by countercurrent electromigration. Heavier Dy isotopes have been enriched toward the anode. The mass effect defined by μ = (Δu/u_Dy)/(ΔM/M_Dy) has been calculated to be -0.032, where Δu is the difference in the mobilities of M (mass number) = 160, 161, 163, or 164 with reference to that of M = 162. A comparison of this value with those previously determined for other molten metal chloride systems suggests that the main electrically conducting species containing Dy is the trivalent cation and not the species shown to exist in the melt by other techniques

[en] The phenomenon of identical bands is studied by analyzing the distributions of fractional changes in the dynamical moments of inertia of pairs of bands in superdeformed (SD) nuclei. These distributions are found to exhibit a peak with a centroid at nearly zero. Their widths increase in going from the SD bands in the mass A ∼ 150, to the SD bands in the mass ∼190 and to the normally-deformed bands in the rare-earth region. These differences may be attributed to the weaker pairing correlations and the stabilizing role of intruder orbitals on the structures of SD bands. Precise level lifetimes have been measured for various pairs of identical SD bands in Gd and Dy isotopes. By comparing the derived quadrupole moments with calculations performed in the framework of the cranking Skyrme-Hartree-Fock model, it is shown that, independently of the intrinsic configuration and of the proton and neutron numbers, the charge moments calculated with respect to the doubly-magic SD core of ¹⁵²Dy can be expressed in terms of independent contributions from the individual hole and particle orbitals. (author)