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Phys. Rev. C 70, 024310 (2004) [15 pages]

Alignments in the odd-proton actinides 237Np and 241Am

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K. Abu Saleem1,2, R. V. F. Janssens1, M. P. Carpenter1, F. G. Kondev1, I. Wiedenhöver1,3, I. Ahmad1, J. Caggiano1 *, P. Chowdhury4, J. A. Cizewski5, D. Cline6, M. Devlin7, N. Fotiades7, J. P. Greene1, G. Hackman8 *, A. Heinz1 †, T. L. Khoo1, T. Lauritsen1, C. J. Lister1, A. O. Macchiavelli9, E. H. Seabury7 ‡, D. Seweryniak1, A. Sonzogni1 §, and C. Y. Wu6
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
4University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA
5Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
6University of Rochester, Rochester, New York 14627, USA
7Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
8University of Kansas, Lawrence, Kansas 66045-7582, USA
9Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Received 18 May 2004; published 26 August 2004

High spin states in 237Np and 241Am have been studied with the “unsafe” Coulomb excitation technique. In each nucleus, signature partner rotational bands built on the [523]5∕2− and [642]5∕2+ orbitals of respective h9∕2 and i13∕2 parentage have been delineated. An additional pair of bands based on the [521]3∕2− (f7∕2) state was also observed in 241Am . New information on the even-even 236Pu and 242Cm transfer products is also presented. From the present data, the role of i13∕2 protons in generating angular momentum in the even-even nuclei of the region is documented. A satisfactory description of the evolution of the rotational sequences with spin is achieved within the framework of the cranked shell model. Nevertheless, when combined with information on odd-neutron nuclei available from elsewhere, the data highlight significant shortcomings of the available theoretical predictions.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.70.024310
DOI: 10.1103/PhysRevC.70.024310
PACS: 27.90.+b, 23.20.Lv, 21.10.Re, 21.60.Ev

* Present address: TRIUMF, Vancouver, BC, Canada V6T 2A3.
† Present address: WNSL, Yale University, New Haven, CT 06520-8124.
‡ Present address: INEEL, Idaho Falls, ID 83415-3855.
§ Present address: NNDC, Brookhaven National Laboratory, Upton, NY 11973-5000.

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