Beck, T. ; Werner, V. ; Pietralla, N. ; Bhike, M. ; Cooper, N. ; Friman-Gayer, U. ; Isaak, J. ; Jolos, R. V. ; Kleemann, J. ; Krishichayan, . ; Papst, O. ; Tornow, W. ; Bernards, C. ; Crider, B. P. ; Ilieva, R. S. ; Löher, B. ; Mihai, C. ; Naqvi, F. ; Pascu, S. ; Peters, E. E. ; Prados-Estevez, F. M. ; Ross, T. J. ; Savran, D. ; Vanhoy, J. R. ; Zilges, A. (2020)
ΔK=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy-164 from K Mixing.
In: Physical Review Letters, 125 (9)
doi: 10.1103/PhysRevLett.125.092501
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

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+1→1+K=0)=0.008(1)μ2N 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 R-symmetry quantum number.

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