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ΔK=0M1excitation strength of the well-deformed nucleus164Dy fromK-mixing
Physical Review Letters ( IF 8.385 ) Pub Date : 
T. Beck; V. Werner; N. Pietralla; M. Bhike; N. Cooper; U. Friman-Gayer; J. Isaak; R. V. Jolos; J. Kleemann; Krishichayan; O. Papst; W. Tornow; C. Bernards; B. P. Crider; R. S. Ilieva; B. Löher; C. Mihai; F. Naqvi; S. Pascu; E. E. Peters; F. M. Prados-Estevez; T. J. Ross; D. Savran; J. R. Vanhoy; A. Zilges

The size of a ΔK=0 M1 excitation strength has been determined for the first time in a predominantly axially deformed even-even nucleus. It has been obtained from the observation of a rare K-mixing situation between two close-lying Jπ=1+ states of the nucleus 164Dy with components characterized by intrinsic projection quantum numbers K=0 and K=1. Nuclear resonance fluorescence induced by quasimonochromatic linearly polarized γ-ray beams provided evidence for K mixing of the 1+ states at 3159.1(3) and 3173.6(3),keV in excitation energy from their γ-decay branching ratios into the ground-state band. The ΔK=0 transition strength of B(M1;0+1K=0+)=0.008(1)μN2 was inferred from a mixing analysis of their M1 transition rates into the ground-state band. It is in agreement with predictions from the quasiparticle phonon nuclear model. This determination represents first experimental information on the M1 excitation strength of a nuclear quantum state with a negative -symmetry quantum number.
更新日期:2020-07-31

 

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