Superdeformation, hyperdeformation and clustering in the actinide region

A. Krasznahorkay, D. Habs, M. Hunyadi, D. Gassmann, M. Csatlós, Y. Eisermann, T. Faestermann, G. Graw, J. Gúlyas, R. Hertenberger, H. J. Maier, Z. Mäté, A. Metz, J. Ott, P. Thirolf, S. Y. Van Der Werf

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Abstract

Excited states in the second minimum of 240Pu were populated by the 238U(α,2n) reaction at Eα=25 MeV. Conversion electrons from electromagnetic transitions preceding the fission of the 3.7 ns 240fPu shape isomer have been measured. In a combined analysis of e- and high resolution γ-ray spectroscopy data previously established octupole bands could be studied in more detail. In order to study higher lying states in the second and third minimum the 239Pu(d,pf)240Pu, and the 233U(d,pf)234U reactions have been studied with high energy resolution. The observed fission resonances were described as members of rotational bands with rotational parameters characteristic to super- and hyperdeformed nuclear shapes. The level density of the most strongly excited states has been compared to the prediction of the back-shifted Fermi-gas formula and the energy of the ground state in third minimum has been estimated for the first time in 234U. The fission fragment mass distribution of the hyperdeformed states in 236U has also been measured. The width of the mass distribution, coincident with the hyperdeformed bands, is significantly smaller than the ones obtained in coincidence with background regions below and above the resonances, which suggests a pear-shaped di-nuclear configuration of 236U in the third well of the potential barrier.

Original languageEnglish
Pages (from-to)657-667
Number of pages11
JournalActa Physica Polonica B
Volume32
Issue number3
Publication statusPublished - Dec 1 2001
EventInternational Conference on Nuclear Physics - Zakopane, Poland
Duration: Sep 5 2000Sep 13 2000

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Krasznahorkay, A., Habs, D., Hunyadi, M., Gassmann, D., Csatlós, M., Eisermann, Y., Faestermann, T., Graw, G., Gúlyas, J., Hertenberger, R., Maier, H. J., Mäté, Z., Metz, A., Ott, J., Thirolf, P., & Van Der Werf, S. Y. (2001). Superdeformation, hyperdeformation and clustering in the actinide region. Acta Physica Polonica B, 32(3), 657-667.