Δ$$\textit{K}=0 \textit{M}1$$ Excitation Strength of the Well-Deformed Nucleus 164Dy from $$\textit{K}$$ Mixing
- Technische Univ. Darmstadt (Germany)
- Technische Univ. Darmstadt (Germany); Yale Univ., New Haven, CT (United States)
- Duke Univ., Durham, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
- Yale Univ., New Haven, CT (United States)
- Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); Dubna State University (Russia)
- Univ. of Kentucky, Lexington, KY (United States)
- Yale Univ., New Haven, CT (United States); Univ. of Surrey, Guildford (United Kingdom)
- GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
- Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest (Romania)
- US Naval Academy, Annapolis, MD (United States)
- Univ. zu Koln (Germany)
We report the size of a Δ$$\textit{K}=0 \textit{M}1$$ 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 $$\textit{K}$$-mixing situation between two close-lying $J^π = 1^+$ states of the nucleus 164Dy with components characterized by intrinsic projection quantum numbers $$\textit{K}$$ = 0 and $$\textit{K}$$ = 1. Nuclear resonance fluorescence induced by quasimonochromatic linearly polarized γ-ray beams provided evidence for $$\textit{K}$$ 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 Δ$$\textit{K}$$ = 0 transition strength of $$B(M1; 0^+_1 → 1^+_{K=0}) = 0.008(1)μ^2_N$$ was inferred from a mixing analysis of their $$\textit{M}$$1 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 $$\textit{M}$$1 excitation strength of a nuclear quantum state with a negative $$\mathcal{R}$$-symmetry quantum number.
- Research Organization:
- Yale Univ., New Haven, CT (United States); Duke Univ., Durham, NC (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Federal Ministry of Education and Research (BMBF); State of Hesse; German Research Foundation (DFG); National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-91ER40609; FG02-97ER41033; 05P18RDEN9; 05P18RDFN1/9; 05P18PKEN9; SFB 1245; PHY-1913028
- OSTI ID:
- 1800747
- Journal Information:
- Physical Review Letters, Vol. 125, Issue 9; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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