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Coulomb excitation of230Th with32S,84Kr and142Nd projectiles

  • Heavy Ion Physics, Fission
  • Published:
Zeitschrift für Physik A Atomic Nuclei

Abstract

The Coulomb excitation measurements for the230Th nucleus with32S,84Kr and142Nd projectiles are presented. The use of different projectiles allowed us to get information in the ground-state band and side bands. The energy spectrum of the ground-state band and of the lowest negative-parity band have been investigated up to the spin valueI=24+ andI=19−(21), respectively. Five side bands (K π=0+, 2 +1 , 2 +2 , 1−, 2−) were observed also. The branching ratios for a large number of transitions in the spin regionI≦10 for π=+1 andI≦9 for π=− 1 are analysed. The full set of experimental data contains information on the mixing of the adiabatic states and on the nuclear response to the electromagnetic field ofγ-radiation. It is shown that the experimental data may be explained taking into account the coupling of the ground-β- and twoγ-bands and also of theK π=0−, 1− and 2− negative-parity bands. An enhancement of the transitions from theγ-to theβ-band in respect to the transitions from theγ to the ground band and from theβ- to the ground band is reported. The mixing of the negative-parity bands is found to be typical for the alignment of the octupole-vibrational angular momentum. The strong spin dependence of the intrinsic matrix elements of the electric-dipole operator follows from the branching ratios of inter- and intra-band transitions from theK π=0− states.

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Author information

Author notes

  1. A. Celler

    Present address: Triumph, Vancouver, Canada

  2. S. Hlavač

    Present address: Institute of Physics, Slovak Academy of Sciences, 84228, Bratislava, Czechoslovakia

  3. Ph. N. Usmanov

    Present address: Institute of Physics, Academy of Science of the Usbek Republic, Tachkent, USSR

Authors and Affiliations

  1. Institute of Physics, Jagiellonian University, Kraków, Poland

    R. Kulessa

  2. Gesellschaft für Schwerionenforschung, Federal Republic of Germany

    R. Kulessa

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

    Ch. Briançon, A. Lefebvre, C. F. Liang, J. P. Thibaud, R. J. Walen & A. Celler

  4. Sektion Physik, Universität München, Garching, Federal Republic of Germany

    Ch. Lauterbach, J. De Boer, Ch. Mittag, F. Riess & Ch. Schandera

  5. Gesellschaft für Schwerionenforschung, Darmstadt, Federal Republic of Germany

    H. Emling, S. Hlavač & R. S. Simon

  6. Joint Institute for Nuclear Research, Dubna, Moscow, USSR

    I. N. Mikhailov & Ph. N. Usmanov

Authors
  1. R. Kulessa
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  2. Ch. Briançon
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  3. A. Lefebvre
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  4. C. F. Liang
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  9. J. De Boer
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Additional information

This work has been performed partly in the framework of the IN2P3 — Polish Laboratories and IN2P3 — JINR Dubna collaborative agreement. It has been also partly supported by the Polish Ministry of National Education under the contract No. CPBP 01.09.

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Kulessa, R., Briançon, C., Lefebvre, A. et al. Coulomb excitation of230Th with32S,84Kr and142Nd projectiles. Z. Physik A - Atomic Nuclei 334, 299–314 (1989). https://doi.org/10.1007/BF01284558

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  • DOI: https://doi.org/10.1007/BF01284558

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