Strongly deformed nuclei near the magic proton shell 82?

Isotope shift of182Hg and an update of nuclear moments and charge radii in the isotope range181Hg-206Hg

“…This indicates that any dynamical effect entering into (fl2)1/2, but not in (f12>, is small. The negative Q~ values are in agreement with many theoretical expectations [65], [673, [68]. Hence the strong-coupling scheme seems to be quite adequate for the ground states of these 1= 3/2 nuclei, although the deformation is small.…”

“…As has been mentioned above, the onset of strong deformation in the light even-A Hg isotopes was the subject of many theoretical papers [-43], [65], [66], [67], [68]. These calculations differ in the prediction of the mass number at which the shape transition should occur, but they all expect the ground state of 182Hg to be strongly prolate.…”

Evidence for nuclear shape coexistence in180Hg

“…The continuing drop of the energy difference in i82Hg is in contrast to the predictions of Barfield et al [5] based on the Interacting Boson Model and it is also in contrast to recent calculations of the nuclear potential-energy surface performed by M611er and Nix [6], which indicate that the minimum of the energy difference between the two coexisting shapes should occur in aS4Hg. On the other hand, previous potential-energy-surface calculations of Frauendorf and Pashkevich [7] and of Faessler et al [8] do predict that the drop of the energy difference should continue at least down to 18aHg (Ref. 7) or even down to 18~ (Ref.…”

“…7) or even down to 18~ (Ref. 8). Spectroscopic information on 18~ therefore is highly desirable to further test the ability of the current theoretical models to describe the nuclear shape coexistence in these nuclei far from beta stability.…”

Determination of Nuclear Ground State Properties Far From Stability by Optical Pumping

“…One possibility could be the sudden appearence of strong deformation with fi w 0.3, a great surprise so close to the magic proton number Z = 82. Theoretical calculations of the Strutinsky type are being performed with a clear tendency to reproduce the result [19], [20] (*). Quan-(*) Note added in proof : Hartree Fock calculations are presented at this congress by P. Quentin which again support this interpretation [25].…”