Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing

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

doi:10.1103/PhysRevLett.125.092501

Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing

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. PetersF. M. Prados-Estevez, T. J. Ross, D. Savran, J. R. Vanhoy, A. Zilges

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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 Dy164 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;01+→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 R-symmetry quantum number.

Original language	English
Article number	092501
Journal	Physical Review Letters
Volume	125
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.125.092501
State	Published - Aug 28 2020

Bibliographical note

Publisher Copyright:
© 2020 American Physical Society.

Funding

The authors thank the accelerator crew for providing excellent experimental conditions and A. Leviatan for stimulating discussions. This work was supported by the BMBF under Grants No. 05P18RDEN9, No. 05P18RDFN1/9, and No. 05P18PKEN9, by the State of Hesse under the grant “Nuclear Photonics” within the LOEWE program, by the Deutsche Forschungsgemeinschaft (DFG) under Grant No. SFB 1245 (Project ID 279384907), and by the U.S. DOE Grants No. DE-FG02-91ER-40609 and No. DE-FG02-97ER-41033. T. B., U. F. G., J. K., and O. P. acknowledge support by the Helmholtz Graduate School for Hadron and Ion Research of the Helmholtz Association. The authors are thankful to the former Wright Nuclear Structure Laboratory, Yale University, and the Institute for Nuclear Physics, University of Cologne, for providing the targets. This material is based upon work supported by the U.S. National Science Foundation under Grant No. PHY-1913028.

Funders	Funder number
National Science Foundation Arctic Social Science Program	PHY-1913028
U.S. Department of Energy EPSCoR	DE-FG02-97ER-41033, DE-FG02-91ER-40609
Deutsche Forschungsgemeinschaft	279384907, SFB 1245
Bundesministerium für Bildung und Forschung	05P18RDFN1/9, 05P18PKEN9, 05P18RDEN9
Max Delbrück Center for Molecular Medicine in the Helmholtz Association

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General Physics and Astronomy

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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., ... Zilges, A. (2020). Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing. Physical Review Letters, 125(9), Article 092501. https://doi.org/10.1103/PhysRevLett.125.092501

@article{10d8d9b219ae49c0887574f66b4c870c,

title = "Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing",

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 Dy164 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;01+→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 R-symmetry quantum number.",

author = "T. Beck and V. Werner and N. Pietralla and M. Bhike and N. Cooper and U. Friman-Gayer and J. Isaak and Jolos, \{R. V.\} and J. Kleemann and Krishichayan and O. Papst and W. Tornow and C. Bernards and Crider, \{B. P.\} and Ilieva, \{R. S.\} and B. L{\"o}her and C. Mihai and F. Naqvi and S. Pascu and Peters, \{E. E.\} and Prados-Estevez, \{F. M.\} and Ross, \{T. J.\} and D. Savran and Vanhoy, \{J. R.\} and A. Zilges",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = aug,

day = "28",

doi = "10.1103/PhysRevLett.125.092501",

language = "English",

volume = "125",

number = "9",

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Beck, T, Werner, V, Pietralla, N, Bhike, M, Cooper, N, Friman-Gayer, U, Isaak, J, Jolos, RV, Kleemann, J, Krishichayan, Papst, O, Tornow, W, Bernards, C, Crider, BP, Ilieva, RS, Löher, B, Mihai, C, Naqvi, F, Pascu, S, Peters, EE, Prados-Estevez, FM, Ross, TJ, Savran, D, Vanhoy, JR & Zilges, A 2020, 'Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing', Physical Review Letters, vol. 125, no. 9, 092501. https://doi.org/10.1103/PhysRevLett.125.092501

TY - JOUR

T1 - Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing

AU - Beck, T.

AU - Werner, V.

AU - Pietralla, N.

AU - Bhike, M.

AU - Cooper, N.

AU - Friman-Gayer, U.

AU - Isaak, J.

AU - Jolos, R. V.

AU - Kleemann, J.

AU - Krishichayan,

AU - Papst, O.

AU - Tornow, W.

AU - Bernards, C.

AU - Crider, B. P.

AU - Ilieva, R. S.

AU - Löher, B.

AU - Mihai, C.

AU - Naqvi, F.

AU - Pascu, S.

AU - Peters, E. E.

AU - Prados-Estevez, F. M.

AU - Ross, T. J.

AU - Savran, D.

AU - Vanhoy, J. R.

AU - Zilges, A.

PY - 2020/8/28

Y1 - 2020/8/28

N2 - 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 Dy164 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;01+→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 R-symmetry quantum number.

AB - 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 Dy164 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;01+→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 R-symmetry quantum number.

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DO - 10.1103/PhysRevLett.125.092501

M3 - Article

C2 - 32915599

AN - SCOPUS:85090873513

SN - 0031-9007

VL - 125

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 092501

ER -

Δk=0 M1 Excitation Strength of the Well-Deformed Nucleus Dy 164 from K Mixing

Abstract

Bibliographical note

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