Alignments in the odd-proton actinides $^{237}\mathrm{Np}$ and $^{241}\mathrm{Am}$

Alignments in the odd-proton actinides ${}^{237}{Np}$ and ${}^{241}{Am}$

K. Abu Saleem, R. V. F. Janssens, M. P. Carpenter, F. G. Kondev, I. Wiedenhöver, I. Ahmad, J. Caggiano, P. Chowdhury, J. A. Cizewski, D. Cline, M. Devlin, N. Fotiades, J. P. Greene, G. Hackman, A. Heinz, T. L. Khoo, T. Lauritsen, C. J. Lister, A. O. Macchiavelli, E. H. Seabury, D. Seweryniak, A. Sonzogni, and C. Y. Wu

Phys. Rev. C 70, 024310 – Published 26 August 2004

Abstract

High spin states in ${}^{237}{Np}$ and ${}^{241}{Am}$ 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 $h_{9 ∕ 2}$ and $i_{13 ∕ 2}$ parentage have been delineated. An additional pair of bands based on the $[521] 3 ∕ 2^{-}$ $(f_{7 ∕ 2})$ state was also observed in ${}^{241}{Am}$ . New information on the even-even ${}^{236}{Pu}$ and ${}^{242}{Cm}$ transfer products is also presented. From the present data, the role of $i_{13 ∕ 2}$ 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.

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Received 18 May 2004

DOI:https://doi.org/10.1103/PhysRevC.70.024310

Authors & Affiliations

K. Abu Saleem^1,2, R. V. F. Janssens¹, M. P. Carpenter¹, F. G. Kondev¹, I. Wiedenhöver^1,3, I. Ahmad¹, J. Caggiano^1,*, P. Chowdhury⁴, J. A. Cizewski⁵, D. Cline⁶, M. Devlin⁷, N. Fotiades⁷, J. P. Greene¹, G. Hackman^8,*, A. Heinz^1,†, T. L. Khoo¹, T. Lauritsen¹, C. J. Lister¹, A. O. Macchiavelli⁹, E. H. Seabury^7,‡, D. Seweryniak¹, A. Sonzogni^1,§, 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

^*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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Vol. 70, Iss. 2 — August 2004

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Physical Review C

covering nuclear physics

Alignments in the odd-proton actinides ${}^{237}{Np}$ and ${}^{241}{Am}$

Phys. Rev. C 70, 024310 – Published 26 August 2004

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Alignments in the odd-proton actinides Np237 and Am241

Phys. Rev. C 70, 024310 – Published 26 August 2004

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Alignments in the odd-proton actinides ${}^{237}{Np}$ and ${}^{241}{Am}$