E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state

T. Beck, J. Beller, N. Pietralla, M. Bhike, Johnny Birkhan, V. Derya, U. Gayer, A. Hennig, J. Isaak, B. Loeher, V. Yu. Ponomarev, A Richter, C. Romig, D. Savran, Marcus Scheck, W. Tornow, V. Werner, A. Zilges, M. Zweidinger

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Abstract

The E2/M1 multipole mixing ratio δ1→2 of the 1+sc→2+γ-ray decay in 156Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched 156Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying Jπ=2+ member of the rotational band of states on top of the 1+ band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.
Original languageEnglish
Article number212502
JournalPhysical Review Letters
Volume118
DOIs
Publication statusPublished - 26 May 2017

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rotational states
rays
decay
nuclear models
mixing ratios
multipoles
angular distribution
bosons
quadrupoles
signatures
neutrons
nuclei
protons
energy

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Beck, T., Beller, J., Pietralla, N., Bhike, M., Birkhan, J., Derya, V., ... Zweidinger, M. (2017). E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state. Physical Review Letters, 118, [212502 ]. https://doi.org/10.1103/PhysRevLett.118.212502
Beck, T. ; Beller, J. ; Pietralla, N. ; Bhike, M. ; Birkhan, Johnny ; Derya, V. ; Gayer, U. ; Hennig, A. ; Isaak, J. ; Loeher, B. ; Ponomarev, V. Yu. ; Richter, A ; Romig, C. ; Savran, D. ; Scheck, Marcus ; Tornow, W. ; Werner, V. ; Zilges, A. ; Zweidinger, M. / E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state. In: Physical Review Letters. 2017 ; Vol. 118.
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abstract = "The E2/M1 multipole mixing ratio δ1→2 of the 1+sc→2+1 γ-ray decay in 156Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched 156Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying Jπ=2+ member of the rotational band of states on top of the 1+ band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.",
author = "T. Beck and J. Beller and N. Pietralla and M. Bhike and Johnny Birkhan and V. Derya and U. Gayer and A. Hennig and J. Isaak and B. Loeher and Ponomarev, {V. Yu.} and A Richter and C. Romig and D. Savran and Marcus Scheck and W. Tornow and V. Werner and A. Zilges and M. Zweidinger",
year = "2017",
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language = "English",
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Beck, T, Beller, J, Pietralla, N, Bhike, M, Birkhan, J, Derya, V, Gayer, U, Hennig, A, Isaak, J, Loeher, B, Ponomarev, VY, Richter, A, Romig, C, Savran, D, Scheck, M, Tornow, W, Werner, V, Zilges, A & Zweidinger, M 2017, 'E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state' Physical Review Letters, vol. 118, 212502 . https://doi.org/10.1103/PhysRevLett.118.212502

E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state. / Beck, T.; Beller, J.; Pietralla, N.; Bhike, M.; Birkhan, Johnny; Derya, V.; Gayer, U.; Hennig, A.; Isaak, J.; Loeher, B.; Ponomarev, V. Yu.; Richter, A; Romig, C.; Savran, D.; Scheck, Marcus; Tornow, W.; Werner, V.; Zilges, A.; Zweidinger, M.

In: Physical Review Letters, Vol. 118, 212502 , 26.05.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - E2 decay strength of the M1 scissors mode of 156Gd and its first excited rotational state

AU - Beck, T.

AU - Beller, J.

AU - Pietralla, N.

AU - Bhike, M.

AU - Birkhan, Johnny

AU - Derya, V.

AU - Gayer, U.

AU - Hennig, A.

AU - Isaak, J.

AU - Loeher, B.

AU - Ponomarev, V. Yu.

AU - Richter, A

AU - Romig, C.

AU - Savran, D.

AU - Scheck, Marcus

AU - Tornow, W.

AU - Werner, V.

AU - Zilges, A.

AU - Zweidinger, M.

PY - 2017/5/26

Y1 - 2017/5/26

N2 - The E2/M1 multipole mixing ratio δ1→2 of the 1+sc→2+1 γ-ray decay in 156Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched 156Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying Jπ=2+ member of the rotational band of states on top of the 1+ band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.

AB - The E2/M1 multipole mixing ratio δ1→2 of the 1+sc→2+1 γ-ray decay in 156Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched 156Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying Jπ=2+ member of the rotational band of states on top of the 1+ band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.

U2 - 10.1103/PhysRevLett.118.212502

DO - 10.1103/PhysRevLett.118.212502

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JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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