The strongly shape driving πh9/2[541]l/2- configuration with α=+1/2 exhibits some anomalous, and so far unexplained, features concerning the crossing frequency, h{combining short stroke overlay}ωc, the aligned angular momentum, ix, and interaction strength, at the alignment of the first pair of i13/2 quasineutrons in several odd-Z rare earth-nuclei. The h9/2[541]1/2- and h11/2[523]7/2- bands have been studied in the stably deformed rare-earth nucleus163Tm to investigate these features. A difference in band crossing frequency of ∼ 80 keV between the two bands is found. Rotational bands built on these two configurations have been found to cross in the spin range I=25/2-29/2 h{combining short stroke overlay}. The γ-decay pattern between the two bands is established in the crossing region and analysed in terms of a moderate shape difference between them. A theoretical estimate of the size of the interaction strength between the two bands is presented and compared to the experimental value. The observed band structure in163Tm is very similar to that of167Lu which has 2 protons and 2 neutrons in addition. This observation is discussed in relation to the similarity of the yrast bands of the two even-even "core" nuclei162Er and166Yb, for which the γ-transition energies are identical within ∼0.2 keV below the vi13/2 crossing. © 1991 Springer-Verlag.

Interaction strength and shape difference for the h9/2 and h11/2 configurations in163Tm / H.J. Jensen, G.B. Hagemann, P.O. Tjom, S. Frauendorf, A. Atac, M. Bergstrom, A. Bracco, A. Brockstedt, H. Carlsson, P. Ekstrom, J.M. Espino, B. Herskind, F. Ingebretsen, J. Jongman, S. Leoni, R.M. Lieder, T. Lonnroth, A. Maj, B. Million, A. Nordlund, J. Nyberg, M. Piiparinen, H. Ryde, M. Sugawara, A. Virtanen. - In: ZEITSCHRIFT FÜR PHYSIK. A, HADRONS AND NUCLEI. - ISSN 0939-7922. - 340:4(1991), pp. 351-362. [10.1007/BF01290322]

Interaction strength and shape difference for the h9/2 and h11/2 configurations in163Tm

A. Bracco
Membro del Collaboration Group
;
S. Leoni
Membro del Collaboration Group
;
1991

Abstract

The strongly shape driving πh9/2[541]l/2- configuration with α=+1/2 exhibits some anomalous, and so far unexplained, features concerning the crossing frequency, h{combining short stroke overlay}ωc, the aligned angular momentum, ix, and interaction strength, at the alignment of the first pair of i13/2 quasineutrons in several odd-Z rare earth-nuclei. The h9/2[541]1/2- and h11/2[523]7/2- bands have been studied in the stably deformed rare-earth nucleus163Tm to investigate these features. A difference in band crossing frequency of ∼ 80 keV between the two bands is found. Rotational bands built on these two configurations have been found to cross in the spin range I=25/2-29/2 h{combining short stroke overlay}. The γ-decay pattern between the two bands is established in the crossing region and analysed in terms of a moderate shape difference between them. A theoretical estimate of the size of the interaction strength between the two bands is presented and compared to the experimental value. The observed band structure in163Tm is very similar to that of167Lu which has 2 protons and 2 neutrons in addition. This observation is discussed in relation to the similarity of the yrast bands of the two even-even "core" nuclei162Er and166Yb, for which the γ-transition energies are identical within ∼0.2 keV below the vi13/2 crossing. © 1991 Springer-Verlag.
Rare-earth nuclei; high-spin; states; bands; model
Settore FIS/04 - Fisica Nucleare e Subnucleare
1991
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/798286
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