Abstract
The fission probability of Pa was measured as a function of the excitation energy in order to search for hyperdeformed (HD) transmission resonances using the () transfer reaction on a radioactive Pa target. The experiment was performed at the Tandem accelerator of the Maier-Leibnitz Laboratory (MLL) at Garching using the Pa() reaction at a bombarding energy of MeV and with an energy resolution of keV. Two groups of transmission resonances have been observed at excitation energies of and 5.9 MeV. The fine structure of the resonance group at MeV could be interpreted as overlapping rotational bands with a rotational parameter characteristic to a HD nuclear shape ( keV). The fission barrier parameters of Pa have been determined by fitting talys 1.2 nuclear reaction code calculations to the overall structure of the fission probability. From the average level spacing of the states, the excitation energy of the ground state of the third minimum has been deduced to be MeV.
1 More- Received 29 March 2012
DOI:https://doi.org/10.1103/PhysRevC.85.054306
©2012 American Physical Society