Elsevier

Nuclear Physics A

Volume 431, Issue 3, 24 December 1984, Pages 511-544
Nuclear Physics A

Experimental estimates of quasiparticle interactions for rotational nuclei

https://doi.org/10.1016/0375-9474(84)90121-0Get rights and content

Abstract

Previously presented data on rotationally aligned quasiparticle bands in 160,161,162,163Yb are analyzed to give experimental values of the quasiparticle interactions Vμν as a function of rotational frequency. The measured level energies are converted to the rotating frame of reference and expressed as routhians. The routhian of a multi-quasiparticle band is compared to the sum of the routhians of the component quasiparticles at a given frequency, the difference being the quasiparticle interaction. The experimental spectra of bands in these nuclei are consistent with the assumption of a binary interaction between the rotating quasiparticles, where most of the Vμν are in the range −0.3 to −0.1 MeV. Analysis of the shift in the observed crossing frequencies for bands of different quasiparticle number yields similar values. The extracted Vμν are found to have a frequency dependence, which is associated with the loss of alignment of a multi-quasiparticle state. An equidistant-level model is used to estimate the contributions to the quasiparticle interactions by polarization of the collective degrees of freedom. This model yields typical Vμν values of −0.15 MeV, which is only half of some values extracted from experiment. This suggests that the extracted Vμν contain a significant amount of nuclear-structure information.

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    Central Institute for Nuclear Research, Rossendorf, 8051 Dresden PB 19, GDR.

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