Publication

Transition Quadrupole Moments of a Large-Deformation Intruder Band in 163Lu

Nuclear physics

Physics Letters B 303 (1993) 230

Authors:

W. Schmitz, H. Hübel, C.X. Yang, G. Baldsiefen, U. Birkental, G. Fröhlingsdorf, D. Mehta, R. Müsseler, M. Neffgen, P. Willsau, J. Gascon, G.B. Hagemann, A. Maj, D. Müller, J. Nyberg, M. Piiparinen, A. Virtanen, R. Wyss

Summary

The publication measures the quadrupole deformation of a superdeformed (SD) band in ¹⁶³Lu using Doppler Shift Attenuation Method (DSAM) and γ-ray spectroscopy following the ¹³⁰Te(³⁷Cl,4nγ) reaction.

Key findings:

  • Quadrupole Moment: The transition quadrupole moment Qₜ = 10.7 ± 0.7 eb confirms a large prolate deformation (β₂ ≈ 0.4), consistent with triaxial superdeformation (γ ≈ ±20°)
  • Alignment Effects: A backbend in the SD band at ℏω ≈ 0.35 MeV aligns with πi₁₃/₂ proton and νh₁₁/₂ neutron orbital alignments, stabilizing triaxiality.
  • Decay Mechanism: Enhanced E1 transitions from the SD band to normal-deformed (ND) states suggest mixing between SD and ND configurations via octupole vibrations or high-j orbital couplings
  • Model Comparisons: Cranked shell model (CSM) calculations predict triaxial SD minima (γ ≈ +20°) with quadrupole moments (Qₜ ≈ 9.9–11.0 eb) close to experimental values

This work established ¹⁶³Lu as a key case for triaxial superdeformation, linking large deformation to intruder orbital dynamics.

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