| Autor: |
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 |
| Rok vydání: |
2020 |
| Zdroj: |
Physical review letters. 125(9) |
| ISSN: |
1079-7114 |
| Popis: |
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 J^{π}=1^{+} states of the nucleus ^{164}Dy 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)μ_{N}^{2} 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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