Excited superdeformed Kπ = 0+ rotational bands in β-vibrational fission resonances of 240Pu

M. Hunyadi, D. Gassmann, A. Krasznahorkay, D. Habs, P. G. Thirolf, M. Csatlós, Y. Eisermann, T. Faestermann, G. Graw, J. Gulyás, R. Hertenberger, H. J. Maier, Z. Máté, A. Metz, M. J. Chromik

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Abstract

The intermediate structure of fission resonances of 240Pu was observed with an experimental energy resolution of 7 keV in the excitation energy region of E* = 3.8-5.6 MeV using the 239Pu(d, pf)240Pu reaction. Two-vibrational resonance groups centered at E* = 4.6 MeV and 5.1 MeV, and attributed to the excitation of three and four β-phonons, were resolved into individual substates, which could be assigned to the low-spin members of Kπ = 0+ superdeformed (SD) rotational bands. In the region of the lower E* = 4.6 MeV resonance individual moments of inertia of six well separated bands could be extracted for the first time with values of Θ/ℏ2 around 157 MeV-1, close to that of the ground state band in the second well. From the level density of these Kπ = 0+ band heads the excitation energy of the SD ground state was determined to (2.25 ± 0.20) MeV, in agreement with earlier estimates from excitation functions.

Original languageEnglish
Pages (from-to)27-35
Number of pages9
JournalPhysics Letters B
Volume505
Issue number1-4
DOIs
Publication statusPublished - Apr 26 2001

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fission
excitation
ground state
moments of inertia
energy
phonons
estimates

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  • Nuclear and High Energy Physics

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Excited superdeformed Kπ = 0+ rotational bands in β-vibrational fission resonances of 240Pu. / Hunyadi, M.; Gassmann, D.; Krasznahorkay, A.; Habs, D.; Thirolf, P. G.; Csatlós, M.; Eisermann, Y.; Faestermann, T.; Graw, G.; Gulyás, J.; Hertenberger, R.; Maier, H. J.; Máté, Z.; Metz, A.; Chromik, M. J.

In: Physics Letters B, Vol. 505, No. 1-4, 26.04.2001, p. 27-35.

Research output: Contribution to journalArticle

Hunyadi, M, Gassmann, D, Krasznahorkay, A, Habs, D, Thirolf, PG, Csatlós, M, Eisermann, Y, Faestermann, T, Graw, G, Gulyás, J, Hertenberger, R, Maier, HJ, Máté, Z, Metz, A & Chromik, MJ 2001, 'Excited superdeformed Kπ = 0+ rotational bands in β-vibrational fission resonances of 240Pu', Physics Letters B, vol. 505, no. 1-4, pp. 27-35. https://doi.org/10.1016/S0370-2693(01)00341-0
Hunyadi, M. ; Gassmann, D. ; Krasznahorkay, A. ; Habs, D. ; Thirolf, P. G. ; Csatlós, M. ; Eisermann, Y. ; Faestermann, T. ; Graw, G. ; Gulyás, J. ; Hertenberger, R. ; Maier, H. J. ; Máté, Z. ; Metz, A. ; Chromik, M. J. / Excited superdeformed Kπ = 0+ rotational bands in β-vibrational fission resonances of 240Pu. In: Physics Letters B. 2001 ; Vol. 505, No. 1-4. pp. 27-35.
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AU - Hunyadi, M.

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AU - Krasznahorkay, A.

AU - Habs, D.

AU - Thirolf, P. G.

AU - Csatlós, M.

AU - Eisermann, Y.

AU - Faestermann, T.

AU - Graw, G.

AU - Gulyás, J.

AU - Hertenberger, R.

AU - Maier, H. J.

AU - Máté, Z.

AU - Metz, A.

AU - Chromik, M. J.

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N2 - The intermediate structure of fission resonances of 240Pu was observed with an experimental energy resolution of 7 keV in the excitation energy region of E* = 3.8-5.6 MeV using the 239Pu(d, pf)240Pu reaction. Two-vibrational resonance groups centered at E* = 4.6 MeV and 5.1 MeV, and attributed to the excitation of three and four β-phonons, were resolved into individual substates, which could be assigned to the low-spin members of Kπ = 0+ superdeformed (SD) rotational bands. In the region of the lower E* = 4.6 MeV resonance individual moments of inertia of six well separated bands could be extracted for the first time with values of Θ/ℏ2 around 157 MeV-1, close to that of the ground state band in the second well. From the level density of these Kπ = 0+ band heads the excitation energy of the SD ground state was determined to (2.25 ± 0.20) MeV, in agreement with earlier estimates from excitation functions.

AB - The intermediate structure of fission resonances of 240Pu was observed with an experimental energy resolution of 7 keV in the excitation energy region of E* = 3.8-5.6 MeV using the 239Pu(d, pf)240Pu reaction. Two-vibrational resonance groups centered at E* = 4.6 MeV and 5.1 MeV, and attributed to the excitation of three and four β-phonons, were resolved into individual substates, which could be assigned to the low-spin members of Kπ = 0+ superdeformed (SD) rotational bands. In the region of the lower E* = 4.6 MeV resonance individual moments of inertia of six well separated bands could be extracted for the first time with values of Θ/ℏ2 around 157 MeV-1, close to that of the ground state band in the second well. From the level density of these Kπ = 0+ band heads the excitation energy of the SD ground state was determined to (2.25 ± 0.20) MeV, in agreement with earlier estimates from excitation functions.

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