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Rotational band crossings in the actinides

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

In the actinides bothi 13/2 protons andj 15/2 neutrons are close to the Fermi surface. At rapid rotation these high-j particles will unpair and align their orbital angular momentum along the axis of rotation giving rise tos-bands that cross the ground-state band. Coulomb excitation of the odd nuclei 93237 Np (established up to the 45/2+ state) and 92235 U (established up to the 51/2− state) provides specific information about these band crossings: From the saturating alignment of the odd high-j particle in both nuclei at intermediate rotational frequencies we find the aligned angular momentum of thei 13/2 protons-band to be 6.6ħ while the corresponding value for thej 15/2 neutrons-band is 5.5ħ. At more rapid rotation above ℏω=0.18 MeV we observe additional alignment in235U. This is ascribed to the interaction of the protons-band. From the gradual onset of the additional alignment we deduce that forZ=92 the protons-band interacts strongly with the ground-state band and from a comparison of the actual amount of alignment with the full value of 6.6ħ we estimate the crossing to occur around ℏgw pc =0.25 MeV.

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Author notes

  1. F. Folkmann

    Present address: University of Århus, DK-8000, Århus, Denmark

Authors and Affiliations

  1. GSI Darmstadt, Germany

    R. S. Simon & F. Folkmann

  2. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay, France

    Ch. Briançon, J. Libert, J. P. Thibaud & R. J. Walen

  3. The Niels Bohr Institute, Copenhagen, Denmark

    S. Frauendorf

Authors
  1. R. S. Simon
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  2. F. Folkmann
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  3. Ch. Briançon
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  4. J. Libert
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  5. J. P. Thibaud
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  6. R. J. Walen
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  7. S. Frauendorf
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Additional information

On leave from Central Institute for Nuclear Research, Rossendorf, German Democratic Republic

We wish to thank the crews of the ALICE cyclotron and the UNILAC for supplying the Kr and parasitic Pb beams to perform our experiments. The sixfold NaI detector used in the investigation of235U was an anti-Compton shield and pair spectrometer on loan from the University of Munich and we are grateful to Dr. D. Evers who made the detector available to us. SF thanks the Niels Bohr Institute for kind hospitality and the Danish Ministry of Education for a grant.

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Simon, R.S., Folkmann, F., Briançon, C. et al. Rotational band crossings in the actinides. Z Physik A 298, 121–128 (1980). https://doi.org/10.1007/BF01554052

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  • DOI: https://doi.org/10.1007/BF01554052

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