Unsafe coulomb excitation of {sup 240-244}Pu

Journal Article · Thu Sep 02 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59532· OSTI ID:20216654

Wiedenhoever, I ^[1]; Janssens, R V. F. ^[1]; Hackman, G ^[1]; Ahmad, I ^[1]; Greene, J P ^[1]; Amro, H ^[1]; Carpenter, M P ^[1]; Nisius, D T ^[1]; Reiter, P ^[1]; Lauritsen, T ^[1]

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1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The high spin states of {sup 240}Pu and {sup 244}Pu have been investigated with GAMMASPHERE at ATLAS, using Coulomb excitation with a {sup 208}Pb beam at energies above the Coulomb barrier. Data on a transfer channel leading to {sup 242}Pu were obtained as well. In the case of {sup 244}Pu, the yrast band was extended to 34({Dirac_h}/2{pi}), revealing the completed {pi}i{sub 13/2} alignment, a ''first'' for actinide nuclei. The yrast sequence of {sup 242}Pu was also extended to higher spin and a similar backbend was delineated. In contrast, while the ground state band of {sup 240}Pu was measured up to the highest rotational frequencies ever reported in the actinide region ({approx}300 keV), no sign of particle alignment was observed. In this case, several observables such as the large B(E1)/B(E2) branching ratios in the negative parity band, and the vanishing energy staggering between the negative and positive parity bands suggest that the strength of octupole correlations increases with rotational frequency. These stronger correlations may well be responsible for delaying or suppressing the {pi}i{sub 13/2} particle alignment. (c) 1999 American Institute of Physics.

• OSTI ID: 20216654
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 481; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COINCIDENCE METHODS
COULOMB EXCITATION
EXPERIMENTAL DATA
GAMMA SPECTRA
LEAD 208 REACTIONS
NUCLEAR DEFORMATION
OCTUPOLES
PLUTONIUM 240
PLUTONIUM 240 TARGET
PLUTONIUM 244
PLUTONIUM 244 TARGET