A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei

J. F. Sharpey-Schafer; R. A. Bark; S. P. Bvumbi; E. A. Lawrie; J. J. Lawrie; T. E. Madiba; S. N.T. Majola; A. Minkova; S. M. Mullins; P. Papka; D. G. Roux; J. Timár

doi:10.1016/j.nuclphysa.2010.01.014

A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei

J. F. Sharpey-Schafer, R. A. Bark, S. P. Bvumbi, E. A. Lawrie, J. J. Lawrie, T. E. Madiba, S. N.T. Majola, A. Minkova, S. M. Mullins, P. Papka, D. G. Roux, J. Timár

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Abstract

We have used the AFRODITE γ-ray spectrometer to measure yrare structures in ^152,154,155Gd using (α,xn) reactions. The measurements on ^152,154Gd have shown that there is no convincing evidence that the lowest excited 0₂⁺ states are β-vibrations based on the 0₁⁺ ground state. Rather these levels may be regarded as a "second vacuum" each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core 0₂⁺ state in ¹⁵⁴Gd to the [505] 11 / 2^- single-particle quasi-neutron orbital in ¹⁵⁵Gd. The coupling of this orbital to the 2⁺ γ-vibration is observed since this coupling is not Pauli-blocked.

Original language	English
Pages (from-to)	45c-49c
Journal	Nuclear Physics A
Volume	834
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2010.01.014
Publication status	Published - 1 Mar 2010
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.nuclphysa.2010.01.014

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Sharpey-Schafer, J. F., Bark, R. A., Bvumbi, S. P., Lawrie, E. A., Lawrie, J. J., Madiba, T. E., Majola, S. N. T., Minkova, A., Mullins, S. M., Papka, P., Roux, D. G., & Timár, J. (2010). A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei. Nuclear Physics A, 834(1-4), 45c-49c. https://doi.org/10.1016/j.nuclphysa.2010.01.014

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title = "A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei",

abstract = "We have used the AFRODITE γ-ray spectrometer to measure yrare structures in 152,154,155Gd using (α,xn) reactions. The measurements on 152,154Gd have shown that there is no convincing evidence that the lowest excited 02+ states are β-vibrations based on the 01+ ground state. Rather these levels may be regarded as a {"}second vacuum{"} each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core 02+ state in 154Gd to the [505] 11 / 2- single-particle quasi-neutron orbital in 155Gd. The coupling of this orbital to the 2+ γ-vibration is observed since this coupling is not Pauli-blocked.",

author = "Sharpey-Schafer, {J. F.} and Bark, {R. A.} and Bvumbi, {S. P.} and Lawrie, {E. A.} and Lawrie, {J. J.} and Madiba, {T. E.} and Majola, {S. N.T.} and A. Minkova and Mullins, {S. M.} and P. Papka and Roux, {D. G.} and J. Tim{\'a}r",

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doi = "10.1016/j.nuclphysa.2010.01.014",

language = "English",

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Sharpey-Schafer, JF, Bark, RA, Bvumbi, SP, Lawrie, EA, Lawrie, JJ, Madiba, TE, Majola, SNT, Minkova, A, Mullins, SM, Papka, P, Roux, DG & Timár, J 2010, 'A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei', Nuclear Physics A, vol. 834, no. 1-4, pp. 45c-49c. https://doi.org/10.1016/j.nuclphysa.2010.01.014

TY - JOUR

T1 - A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei

T2 - Band structure of N = 88 to N = 91 Nuclei

AU - Sharpey-Schafer, J. F.

AU - Bark, R. A.

AU - Bvumbi, S. P.

AU - Lawrie, E. A.

AU - Lawrie, J. J.

AU - Madiba, T. E.

AU - Majola, S. N.T.

AU - Minkova, A.

AU - Mullins, S. M.

AU - Papka, P.

AU - Roux, D. G.

AU - Timár, J.

PY - 2010/3/1

Y1 - 2010/3/1

N2 - We have used the AFRODITE γ-ray spectrometer to measure yrare structures in 152,154,155Gd using (α,xn) reactions. The measurements on 152,154Gd have shown that there is no convincing evidence that the lowest excited 02+ states are β-vibrations based on the 01+ ground state. Rather these levels may be regarded as a "second vacuum" each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core 02+ state in 154Gd to the [505] 11 / 2- single-particle quasi-neutron orbital in 155Gd. The coupling of this orbital to the 2+ γ-vibration is observed since this coupling is not Pauli-blocked.

AB - We have used the AFRODITE γ-ray spectrometer to measure yrare structures in 152,154,155Gd using (α,xn) reactions. The measurements on 152,154Gd have shown that there is no convincing evidence that the lowest excited 02+ states are β-vibrations based on the 01+ ground state. Rather these levels may be regarded as a "second vacuum" each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core 02+ state in 154Gd to the [505] 11 / 2- single-particle quasi-neutron orbital in 155Gd. The coupling of this orbital to the 2+ γ-vibration is observed since this coupling is not Pauli-blocked.

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SN - 0375-9474

VL - 834

SP - 45c-49c

JO - Nuclear Physics A

JF - Nuclear Physics A

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A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei

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