Octupole correlations in N=88 Dy 154: Octupole vibration versus stable deformation

G. L. Zimba; J. F. Sharpey-Schafer; P. Jones; S. P. Bvumbi; L. P. Masiteng; S. N.T. Majola; T. S. Dinoko; E. A. Lawrie; J. J. Lawrie; D. Negi; P. Papka; D. Roux; O. Shirinda; J. E. Easton; N. A. Khumalo

doi:10.1103/PhysRevC.94.054303

Octupole correlations in N=88 Dy 154: Octupole vibration versus stable deformation

G. L. Zimba, J. F. Sharpey-Schafer, P. Jones, S. P. Bvumbi, L. P. Masiteng, S. N.T. Majola, T. S. Dinoko, E. A. Lawrie, J. J. Lawrie, D. Negi, P. Papka, D. Roux, O. Shirinda, J. E. Easton, N. A. Khumalo

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Abstract

We report on low-spin states of Dy154 populated via the reaction Gd155 (He3,4n) with a beam energy of 37.5 MeV from the Separated Sector Cyclotron at iThemba Laboratory. The AFRODITE γ-ray spectrometer was used to establish new E1 transitions between bands of opposite parity. The measurements broaden the N=88 systematics on the relationship between the first excited positive-parity pairing isomer band and the lowest-lying negative-parity band as the nuclear quadrupole deformation decreases with increasing proton number. In a region of strong octupole correlations the data suggest that the spectroscopy of N=88 nuclei is driven by stable octupole deformations and not by vibrations.

Original language	English
Article number	054303
Journal	Physical Review C
Volume	94
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.94.054303
Publication status	Published - 4 Nov 2016
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.94.054303

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Zimba, G. L., Sharpey-Schafer, J. F., Jones, P., Bvumbi, S. P., Masiteng, L. P., Majola, S. N. T., Dinoko, T. S., Lawrie, E. A., Lawrie, J. J., Negi, D., Papka, P., Roux, D., Shirinda, O., Easton, J. E., & Khumalo, N. A. (2016). Octupole correlations in N=88 Dy 154: Octupole vibration versus stable deformation. Physical Review C, 94(5), Article 054303. https://doi.org/10.1103/PhysRevC.94.054303

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title = "Octupole correlations in N=88 Dy 154: Octupole vibration versus stable deformation",

abstract = "We report on low-spin states of Dy154 populated via the reaction Gd155 (He3,4n) with a beam energy of 37.5 MeV from the Separated Sector Cyclotron at iThemba Laboratory. The AFRODITE γ-ray spectrometer was used to establish new E1 transitions between bands of opposite parity. The measurements broaden the N=88 systematics on the relationship between the first excited positive-parity pairing isomer band and the lowest-lying negative-parity band as the nuclear quadrupole deformation decreases with increasing proton number. In a region of strong octupole correlations the data suggest that the spectroscopy of N=88 nuclei is driven by stable octupole deformations and not by vibrations.",

author = "Zimba, {G. L.} and Sharpey-Schafer, {J. F.} and P. Jones and Bvumbi, {S. P.} and Masiteng, {L. P.} and Majola, {S. N.T.} and Dinoko, {T. S.} and Lawrie, {E. A.} and Lawrie, {J. J.} and D. Negi and P. Papka and D. Roux and O. Shirinda and Easton, {J. E.} and Khumalo, {N. A.}",

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T1 - Octupole correlations in N=88 Dy 154

T2 - Octupole vibration versus stable deformation

AU - Zimba, G. L.

AU - Sharpey-Schafer, J. F.

AU - Jones, P.

AU - Bvumbi, S. P.

AU - Masiteng, L. P.

AU - Majola, S. N.T.

AU - Dinoko, T. S.

AU - Lawrie, E. A.

AU - Lawrie, J. J.

AU - Negi, D.

AU - Papka, P.

AU - Roux, D.

AU - Shirinda, O.

AU - Easton, J. E.

AU - Khumalo, N. A.

PY - 2016/11/4

Y1 - 2016/11/4

N2 - We report on low-spin states of Dy154 populated via the reaction Gd155 (He3,4n) with a beam energy of 37.5 MeV from the Separated Sector Cyclotron at iThemba Laboratory. The AFRODITE γ-ray spectrometer was used to establish new E1 transitions between bands of opposite parity. The measurements broaden the N=88 systematics on the relationship between the first excited positive-parity pairing isomer band and the lowest-lying negative-parity band as the nuclear quadrupole deformation decreases with increasing proton number. In a region of strong octupole correlations the data suggest that the spectroscopy of N=88 nuclei is driven by stable octupole deformations and not by vibrations.

AB - We report on low-spin states of Dy154 populated via the reaction Gd155 (He3,4n) with a beam energy of 37.5 MeV from the Separated Sector Cyclotron at iThemba Laboratory. The AFRODITE γ-ray spectrometer was used to establish new E1 transitions between bands of opposite parity. The measurements broaden the N=88 systematics on the relationship between the first excited positive-parity pairing isomer band and the lowest-lying negative-parity band as the nuclear quadrupole deformation decreases with increasing proton number. In a region of strong octupole correlations the data suggest that the spectroscopy of N=88 nuclei is driven by stable octupole deformations and not by vibrations.

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U2 - 10.1103/PhysRevC.94.054303

DO - 10.1103/PhysRevC.94.054303

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JO - Physical Review C

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ER -

Octupole correlations in N=88 Dy 154: Octupole vibration versus stable deformation

Abstract

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