Experimental search for very extended shapes in the A {approximately}180 region
- and others
A very important question in nuclear structure studies is the adequacy of the Strutinsky method for states at very large deformation. According to our calculations, nuclides in the vicinity of {sup 182}Os are expected to have an accessible minimum that is more deformed than any minimum that has so far been populated at high spin in heavy ion reactions. Studies of this region will provide useful tests of the Strutinsky approach, and perhaps allow us to fine tune some of the ingredients of these calculations dealing with extended shapes. A first attempt to populate this minimum in {sup 182}Os was made by bombarding {sup 138}Ba at the LBL 88 inch cyclotron with a 220 MeV {sup 48}Ca beam. This produces states in {sup 182}Os with angular momenta of I {approximately} 70. Our calculations predict that the very extended minimum (2.2:1) is yrast at this angular momentum. The shapes of nuclei associated with states in this extended minimum is quite different from that of the conventional superdeformed nuclide that bulges out at Z = 0. It is flat and one needs a necking degree of freedom in the deformation space to calculate this minimum. This search was not successful because of oxygen contamination in the target giving rise to many unwanted {gamma} rays. According to our calculations, it should be almost as easy to make states in the 2.2:1 minimum of {sup 180}Os as it is in {sup 182}Os. An experiment was approved at Gammasphere to search for the very extended minimum of {sup 180}Os.
- Research Organization:
- Argonne National Lab., IL (United States)
- OSTI ID:
- 166479
- Report Number(s):
- ANL--95/14; ON: DE96000985
- Country of Publication:
- United States
- Language:
- English
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