High-spin states in Ce136: Systematics of collective oblate rotation

E. S. Paul; D. B. Fossan; Y. Liang; R. Ma; N. Xu; R. Wadsworth; I. Jenkins; P. J. Nolan

doi:10.1103/PhysRevC.41.1576

High-spin states in Ce136: Systematics of collective oblate rotation

E. S. Paul^*, D. B. Fossan, Y. Liang, R. Ma, N. Xu, R. Wadsworth, I. Jenkins, P. J. Nolan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The level structure of the transitional even-even Ce136 nucleus has been investigated using the Sn122(18O, 4n) reaction. The prominent structure observed at high spin is a I=1 rotational band, populated with 25% intensity of the 2+0+ transition, which has a low dynamic moment of inertia <20Latin small letter h with stroke2 MeV-1 for frequencies below Latin small letter h with stroke=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating =-60° oblate shape, and is related to the oblate h11/2[h11/2]2 configuration seen in several nearby odd-Z nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other I=2 bands, built on states including h11/2 quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band (<2% intensity), showing an enhanced dynamic moment of inertia 57Latin small letter h with stroke2 MeV-1, built on the highly deformed [i13/2]2 prolate configuration.

Original language	English
Pages (from-to)	1576-1583
Number of pages	8
Journal	Physical Review C
Volume	41
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.41.1576
Publication status	Published - 1 Jan 1990

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title = "High-spin states in Ce136: Systematics of collective oblate rotation",

abstract = "The level structure of the transitional even-even Ce136 nucleus has been investigated using the Sn122(18O, 4n) reaction. The prominent structure observed at high spin is a I=1 rotational band, populated with 25% intensity of the 2+0+ transition, which has a low dynamic moment of inertia <20Latin small letter h with stroke2 MeV-1 for frequencies below Latin small letter h with stroke=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating =-60° oblate shape, and is related to the oblate h11/2[h11/2]2 configuration seen in several nearby odd-Z nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other I=2 bands, built on states including h11/2 quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band (<2% intensity), showing an enhanced dynamic moment of inertia 57Latin small letter h with stroke2 MeV-1, built on the highly deformed [i13/2]2 prolate configuration.",

author = "Paul, {E. S.} and Fossan, {D. B.} and Y. Liang and R. Ma and N. Xu and R. Wadsworth and I. Jenkins and Nolan, {P. J.}",

year = "1990",

month = jan,

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doi = "10.1103/PhysRevC.41.1576",

language = "English",

volume = "41",

pages = "1576--1583",

journal = "Physical Review C",

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T1 - High-spin states in Ce136

T2 - Systematics of collective oblate rotation

AU - Paul, E. S.

AU - Fossan, D. B.

AU - Liang, Y.

AU - Ma, R.

AU - Xu, N.

AU - Wadsworth, R.

AU - Jenkins, I.

AU - Nolan, P. J.

PY - 1990/1/1

Y1 - 1990/1/1

N2 - The level structure of the transitional even-even Ce136 nucleus has been investigated using the Sn122(18O, 4n) reaction. The prominent structure observed at high spin is a I=1 rotational band, populated with 25% intensity of the 2+0+ transition, which has a low dynamic moment of inertia <20Latin small letter h with stroke2 MeV-1 for frequencies below Latin small letter h with stroke=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating =-60° oblate shape, and is related to the oblate h11/2[h11/2]2 configuration seen in several nearby odd-Z nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other I=2 bands, built on states including h11/2 quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band (<2% intensity), showing an enhanced dynamic moment of inertia 57Latin small letter h with stroke2 MeV-1, built on the highly deformed [i13/2]2 prolate configuration.

AB - The level structure of the transitional even-even Ce136 nucleus has been investigated using the Sn122(18O, 4n) reaction. The prominent structure observed at high spin is a I=1 rotational band, populated with 25% intensity of the 2+0+ transition, which has a low dynamic moment of inertia <20Latin small letter h with stroke2 MeV-1 for frequencies below Latin small letter h with stroke=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating =-60° oblate shape, and is related to the oblate h11/2[h11/2]2 configuration seen in several nearby odd-Z nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other I=2 bands, built on states including h11/2 quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band (<2% intensity), showing an enhanced dynamic moment of inertia 57Latin small letter h with stroke2 MeV-1, built on the highly deformed [i13/2]2 prolate configuration.

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DO - 10.1103/PhysRevC.41.1576

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JO - Physical Review C

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High-spin states in Ce136: Systematics of collective oblate rotation

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