Collective and quasiparticle excitations in superdeformed 190Hg

A. N. Wilson, J. Tímár, J. F. Sharpey-Schafer, B. Crowell, M. P. Carpenter, R. V F Janssens, D. J. Blumenthal, I. Ahmad, A. Astier, F. Azaiez, M. Bergström, L. Ducroux, B. J P Gall, F. Hannachi, T. L. Khoo, A. Korichi, T. Lauritsen, A. Lopez-Martens, M. Meyer, D. NisiusE. S. Paul, M. G. Porquet, N. Redon, J. N. Wilson, T. Nakatsukasa

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Abstract

Superdeformed (SD) states of 190Hg have been studied with the Eurogam Phase 2 γ-ray spectrometer using the 160Gd(34S,4n) reaction. Two new excited SD bands have been found and identified as belonging to this nucleus, bringing the total number of SD bands in 190Hg to 4. One of the new bands has a dynamic moment of inertia that is very similar to that of the yrast SD band of 190Hg and most other SD bands in the A∼190 region. In contrast, the other band has a dynamic moment of inertia which is mainly constant as a function of rotational frequency and exhibits a dramatic increase at the lowest frequencies. The observed dynamic moments of inertia are compared with the results of random phase approximation calculations based on the cranked shell model. Finally, the known excited SD band has been extended towards lower frequencies and new transitions have been found linking this band to the yrast SD band. The extracted B(E1) values of the new linking transitions give further support for the possible octupole vibrational character of this band.

Original languageEnglish
Pages (from-to)559-567
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume54
Issue number2
Publication statusPublished - Aug 1996

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excitation
moments of inertia
low frequencies
rays
spectrometers
nuclei
approximation

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Wilson, A. N., Tímár, J., Sharpey-Schafer, J. F., Crowell, B., Carpenter, M. P., Janssens, R. V. F., ... Nakatsukasa, T. (1996). Collective and quasiparticle excitations in superdeformed 190Hg. Physical Review C - Nuclear Physics, 54(2), 559-567.

Collective and quasiparticle excitations in superdeformed 190Hg. / Wilson, A. N.; Tímár, J.; Sharpey-Schafer, J. F.; Crowell, B.; Carpenter, M. P.; Janssens, R. V F; Blumenthal, D. J.; Ahmad, I.; Astier, A.; Azaiez, F.; Bergström, M.; Ducroux, L.; Gall, B. J P; Hannachi, F.; Khoo, T. L.; Korichi, A.; Lauritsen, T.; Lopez-Martens, A.; Meyer, M.; Nisius, D.; Paul, E. S.; Porquet, M. G.; Redon, N.; Wilson, J. N.; Nakatsukasa, T.

In: Physical Review C - Nuclear Physics, Vol. 54, No. 2, 08.1996, p. 559-567.

Research output: Contribution to journalArticle

Wilson, AN, Tímár, J, Sharpey-Schafer, JF, Crowell, B, Carpenter, MP, Janssens, RVF, Blumenthal, DJ, Ahmad, I, Astier, A, Azaiez, F, Bergström, M, Ducroux, L, Gall, BJP, Hannachi, F, Khoo, TL, Korichi, A, Lauritsen, T, Lopez-Martens, A, Meyer, M, Nisius, D, Paul, ES, Porquet, MG, Redon, N, Wilson, JN & Nakatsukasa, T 1996, 'Collective and quasiparticle excitations in superdeformed 190Hg', Physical Review C - Nuclear Physics, vol. 54, no. 2, pp. 559-567.
Wilson AN, Tímár J, Sharpey-Schafer JF, Crowell B, Carpenter MP, Janssens RVF et al. Collective and quasiparticle excitations in superdeformed 190Hg. Physical Review C - Nuclear Physics. 1996 Aug;54(2):559-567.
Wilson, A. N. ; Tímár, J. ; Sharpey-Schafer, J. F. ; Crowell, B. ; Carpenter, M. P. ; Janssens, R. V F ; Blumenthal, D. J. ; Ahmad, I. ; Astier, A. ; Azaiez, F. ; Bergström, M. ; Ducroux, L. ; Gall, B. J P ; Hannachi, F. ; Khoo, T. L. ; Korichi, A. ; Lauritsen, T. ; Lopez-Martens, A. ; Meyer, M. ; Nisius, D. ; Paul, E. S. ; Porquet, M. G. ; Redon, N. ; Wilson, J. N. ; Nakatsukasa, T. / Collective and quasiparticle excitations in superdeformed 190Hg. In: Physical Review C - Nuclear Physics. 1996 ; Vol. 54, No. 2. pp. 559-567.
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AU - Tímár, J.

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AU - Nisius, D.

AU - Paul, E. S.

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AU - Wilson, J. N.

AU - Nakatsukasa, T.

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N2 - Superdeformed (SD) states of 190Hg have been studied with the Eurogam Phase 2 γ-ray spectrometer using the 160Gd(34S,4n) reaction. Two new excited SD bands have been found and identified as belonging to this nucleus, bringing the total number of SD bands in 190Hg to 4. One of the new bands has a dynamic moment of inertia that is very similar to that of the yrast SD band of 190Hg and most other SD bands in the A∼190 region. In contrast, the other band has a dynamic moment of inertia which is mainly constant as a function of rotational frequency and exhibits a dramatic increase at the lowest frequencies. The observed dynamic moments of inertia are compared with the results of random phase approximation calculations based on the cranked shell model. Finally, the known excited SD band has been extended towards lower frequencies and new transitions have been found linking this band to the yrast SD band. The extracted B(E1) values of the new linking transitions give further support for the possible octupole vibrational character of this band.

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