Levels in 185,~SVAu have been studied by radioactive decay of isotopically separated 185,18VHg" A number of low-energy very-converted transitions are observed in the decay. It is shown that the enhanced conversion in these cases comes from an E0 component rather than from an anomaly in the M 1 conversion process. A systematic pattern of bands interconnected with these very converted transitions is presented as evidence for a new type of particle-core coupling in 185,187Au '
The neutron-deficient isotopes ' " Tl have been studied using collinear fast atom beam laser spectroscopy with mass-separated beams of 7&(10 to 4&( l0' atoms per second. By laser excitation of the 535 nm atomic transitions of atoms in the beam, the 6s 7s S1&2 and 6s 6p P3/2 hyperfine structures were measured, as were the isotope shifts of the 535 nm transitions. From these, the magnetic dipole moments, spectroscopic quadrupole moments, and isotopic changes in mean-square charge radii were deduced. A large isomer shift in '"Tl was observed, implying a larger deformation in the -, isomer than in the -'+ ground state. The " ' '' 'Tl isotopes have deformations that increase as the mass decreases. A deformed shell model calculation indicates that this increase in deformation can account for the drop in energy of the -' bandhead in these isotopes. An increase in neutron pairing correlations, having opposite and compensating effects on the rotational moment of inertia, maintains the spacing of the levels in the -, strong-coupled band. Results for ' Tl differ from previously published values, but are consistent with the 190, 192Tlm d
The electron-capture decay properties of the high-spin isomers in " """Ho were investigated. The nuclides were produced in ', 8 bombardments of samarium and then transported to shielded areas with the use of gasjet systems. Singles and coincidence y-ray measurements were made. Each isomer decays primarily to one excited state in its dysprosium daughter by means of an allowed P transition (logft values are -4.5). The following explanations are proposed, For " Ho and '"Ho the transitions connect 9+(mh]&(2 vf7j2) levels with 8+ (vh9 ]2 Mfa (2) levels in " By(240 1 .8 keV) and ' "Dy(2437.6 keV). Deexcitation to the ground states then follows via a cascade of four E2 y rays. In '"Ho the P transition represents the changeover of an II»" proton orbital to an h9/2 neutron orbital in "'Dy. This single neutron state lies at 527.4 keV and deexcites directly to the ground state. The a decay of '"Ho was also investigated with the use of an on-line isotope separator. Its a-decay branching ratio was determined to be 10.5+ 3.0%%uo. l RADIOACTIVITY "'"Ho, "Ho, "Ho; Ineasured T&/2, F~, I, yy coin; By, '5'. )y, ' Dy deduced level.~&,~J". Ho; measured. I, I,, deduced o.-decay branching ratio: M.ass sepal" atlGIl.
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