C. W. Beausang

Superdeformation in lead nuclei

A rotational band, with energy spacings characteristic of superdeformed shapes, has been identified in194Pb.The band, which consists of 12 members, was produced in the bombardment of176Yb with24Mg. This band extends the mass-194 region of superdeformation to higher Z.

Analysis of High‐Multiplicity Gamma‐Ray Events

A significant improvement in the measured peak‐to‐background ratio of highly‐correlated gamma‐ray cascades can be achieved through the use of high‐multiplicity gamma‐ray coincident events. We studied this effect using data from the 176Yb(22Ne,6n)192Hg reaction at a beam energy of 122 MeV using HERA at the LBL 88‐Inch cyclotron facility. An enriched set of all four‐ and higher‐fold coincidences was culled from these data.

Superdeformed bands in194Tl

Two superdeformed (SD) bands have been found in194Tl using the reactions176Yb(23Na,5n) and181Ta(18O,5n). The mass assignments were made from excitation function data. These are the first SD bands found in the mass-190 region that are not in Hg nuclei. The energies of many of the transitions of one of these new SD bands are similar in energy to those in the SD band of192Hg.

Superdeformed bands in193Hg and194Hg

A superdeformed band, consisting of 12 transitions, is assigned to193Hg on the basis of excitation function and cross bombardment results. A second band is identified which may be the signature partner of this band. In addition, another rotational band is observed which is assigned as the third superdeformed band in194Hg. The similarities of these three bands to those already known in the mercury region are discussed briefly.