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Title: Unsafe coulomb excitation of {sup 240-244}Pu

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. Argonne National Laboratory, Argonne, Illinois 60439 (United States) (and others)
Publication Date:
OSTI Identifier:
20216654
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 481; Journal Issue: 1; Other Information: PBD: 2 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; PLUTONIUM 240 TARGET; PLUTONIUM 244 TARGET; LEAD 208 REACTIONS; COULOMB EXCITATION; PLUTONIUM 240; PLUTONIUM 244; GAMMA SPECTRA; COINCIDENCE METHODS; OCTUPOLES; NUCLEAR DEFORMATION; EXPERIMENTAL DATA

Citation Formats

Wiedenhoever, I., Janssens, R. V. F., Hackman, G., Ahmad, I., Greene, J. P., Amro, H., Carpenter, M. P., Nisius, D. T., Reiter, P., and Lauritsen, T. Unsafe coulomb excitation of {sup 240-244}Pu. United States: N. p., 1999. Web. doi:10.1063/1.59532.
Wiedenhoever, I., Janssens, R. V. F., Hackman, G., Ahmad, I., Greene, J. P., Amro, H., Carpenter, M. P., Nisius, D. T., Reiter, P., & Lauritsen, T. Unsafe coulomb excitation of {sup 240-244}Pu. United States. doi:10.1063/1.59532.
Wiedenhoever, I., Janssens, R. V. F., Hackman, G., Ahmad, I., Greene, J. P., Amro, H., Carpenter, M. P., Nisius, D. T., Reiter, P., and Lauritsen, T. Thu . "Unsafe coulomb excitation of {sup 240-244}Pu". United States. doi:10.1063/1.59532.
@article{osti_20216654,
title = {Unsafe coulomb excitation of {sup 240-244}Pu},
author = {Wiedenhoever, I. and Janssens, R. V. F. and Hackman, G. and Ahmad, I. and Greene, J. P. and Amro, H. and Carpenter, M. P. and Nisius, D. T. and Reiter, P. and Lauritsen, T.},
abstractNote = {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.},
doi = {10.1063/1.59532},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 481,
place = {United States},
year = {1999},
month = {9}
}