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Evidence for second-phonon nuclear wobbling.

D R Jensen1, G B Hagemann, I Hamamoto

  • 1The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.

Physical Review Letters
|October 9, 2002
PubMed
Summary
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Researchers observed triaxial, strongly deformed (TSD) bands in the 163Lu nucleus. Evidence suggests a two-phonon wobbling excitation, consistent with particle-rotor model predictions.

Area of Science:

  • Nuclear Physics
  • High-Energy Physics
  • Spectroscopy

Background:

  • Triaxial, strongly deformed (TSD) nuclear structures offer insights into complex nuclear shapes.
  • Wobbling excitations are characteristic phenomena in certain deformed nuclei.

Purpose of the Study:

  • To investigate the nuclear structure of 163Lu populated via the 139La(29Si,5n) reaction.
  • To identify and characterize triaxial, strongly deformed (TSD) bands and their excitations.

Main Methods:

  • Nuclear reaction: 139La(29Si,5n) at 157 MeV beam energy.
  • Spectroscopic analysis of emitted radiation to identify nuclear bands.
  • Comparison of experimental data with particle-rotor model calculations.

Main Results:

Related Experiment Videos

  • Three TSD bands with similar rotational properties were observed in 163Lu.
  • The first excited TSD band was confirmed as a one-phonon wobbling excitation.
  • Experimental B(E2) ratios support the assignment of a two-phonon wobbling excitation between TSD bands.

Conclusions:

  • The observed TSD bands in 163Lu exhibit characteristics of wobbling excitations.
  • The findings provide evidence for a two-phonon wobbling mode in this nucleus.
  • The results validate the predictive power of the particle-rotor model for complex nuclear excitations.