Δ$\textit{K}=0 \textit{M}1$ Excitation Strength of the Well-Deformed Nucleus 164Dy from $\textit{K}$ Mixing

Beck, T.; Werner, V.; Pietralla, N.; Bhike, M.; Cooper, N.; Friman-Gayer, U.; Isaak, J.; Jolos, R.  V.; Kleemann, J.; Krishichayan, None; 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.

doi:10.1103/physrevlett.125.092501

Title: Δ$$\textit{K}=0 \textit{M}1$$ Excitation Strength of the Well-Deformed Nucleus ¹⁶⁴Dy from $$\textit{K}$$ Mixing

Journal Article · Wed Aug 26 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.092501· OSTI ID:1800747

^[1]; Werner, V. ^[2]; Pietralla, N. ^[1]; Bhike, M. ^[3]; Cooper, N. ^[4]; Friman-Gayer, U. ^[1]; Isaak, J. ^[1]; Jolos, R. V. ^[5]; Kleemann, J. ^[1]; Krishichayan, None ^[3]; Papst, O. ^[1]; Tornow, W. ^[3]; Bernards, C. ^[4]; Crider, B. P. ^[6]; Ilieva, R. S. ^[7]; Löher, B. ^[8]; Mihai, C. ^[9]; Naqvi, F. ^[4]; Pascu, S. ^[9]; Peters, E. E. ^[6] more »

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.

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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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