Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156

S. N.T. Majola; D. J. Hartley; L. L. Riedinger; J. F. Sharpey-Schafer; J. M. Allmond; C. Beausang; M. P. Carpenter; C. J. Chiara; N. Cooper; D. Curien; B. J.P. Gall; P. E. Garrett; R. V.F. Janssens; F. G. Kondev; W. D. Kulp; T. Lauritsen; E. A. McCutchan; D. Miller; J. Piot; N. Redon; M. A. Riley; J. Simpson; I. Stefanescu; V. Werner; X. Wang; J. L. Wood; C. H. Yu; S. Zhu

doi:10.1103/PhysRevC.91.034330

Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156

S. N.T. Majola, D. J. Hartley, L. L. Riedinger, J. F. Sharpey-Schafer, J. M. Allmond, C. Beausang, M. P. Carpenter, C. J. Chiara, N. Cooper, D. Curien, B. J.P. Gall, P. E. Garrett, R. V.F. Janssens, F. G. Kondev, W. D. Kulp, T. Lauritsen, E. A. McCutchan, D. Miller, J. Piot, N. RedonM. A. Riley, J. Simpson, I. Stefanescu, V. Werner, X. Wang, J. L. Wood, C. H. Yu, S. Zhu

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23 Citations (Scopus)

Abstract

The exact nature of the lowest Kπ=2+ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the γ degree of freedom perpendicular to the nuclear symmetry axis. Very few such γ bands have been traced past the usual backbending rotational alignments of high-j nucleons. We have investigated the structure of positive-parity bands in the N=90 nucleus Dy156, using the Nd148(C12,4n)Dy156 reaction at 65 MeV, observing the resulting γ-ray transitions with the Gammasphere array. The even- and odd-spin members of the Kπ=2+γ band are observed up to 32+ and 31+, respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible γ vibration built on the aligned yrast S band are observed up to spins 28+ and 27+. An even-spin positive-parity band, observed up to spin 24+, is a candidate for an aligned S band built on the seniority-zero configuration of the 02+ state at 676 keV. The crossing of this band with the 02+ band is at ?ωc=0.28(1)MeV and is consistent with the configuration of the 02+ band not producing any blocking of the monopole pairing.

Original language	English
Article number	034330
Journal	Physical Review C - Nuclear Physics
Volume	91
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.91.034330
Publication status	Published - 26 Mar 2015
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.91.034330

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Majola, S. N. T., Hartley, D. J., Riedinger, L. L., Sharpey-Schafer, J. F., Allmond, J. M., Beausang, C., Carpenter, M. P., Chiara, C. J., Cooper, N., Curien, D., Gall, B. J. P., Garrett, P. E., Janssens, R. V. F., Kondev, F. G., Kulp, W. D., Lauritsen, T., McCutchan, E. A., Miller, D., Piot, J., ... Zhu, S. (2015). Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156. Physical Review C - Nuclear Physics, 91(3), Article 034330. https://doi.org/10.1103/PhysRevC.91.034330

@article{ecc171a650dc435f9de9bdb2f36b818d,

title = "Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156",

abstract = "The exact nature of the lowest Kπ=2+ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the γ degree of freedom perpendicular to the nuclear symmetry axis. Very few such γ bands have been traced past the usual backbending rotational alignments of high-j nucleons. We have investigated the structure of positive-parity bands in the N=90 nucleus Dy156, using the Nd148(C12,4n)Dy156 reaction at 65 MeV, observing the resulting γ-ray transitions with the Gammasphere array. The even- and odd-spin members of the Kπ=2+γ band are observed up to 32+ and 31+, respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible γ vibration built on the aligned yrast S band are observed up to spins 28+ and 27+. An even-spin positive-parity band, observed up to spin 24+, is a candidate for an aligned S band built on the seniority-zero configuration of the 02+ state at 676 keV. The crossing of this band with the 02+ band is at ?ωc=0.28(1)MeV and is consistent with the configuration of the 02+ band not producing any blocking of the monopole pairing.",

author = "Majola, {S. N.T.} and Hartley, {D. J.} and Riedinger, {L. L.} and Sharpey-Schafer, {J. F.} and Allmond, {J. M.} and C. Beausang and Carpenter, {M. P.} and Chiara, {C. J.} and N. Cooper and D. Curien and Gall, {B. J.P.} and Garrett, {P. E.} and Janssens, {R. V.F.} and Kondev, {F. G.} and Kulp, {W. D.} and T. Lauritsen and McCutchan, {E. A.} and D. Miller and J. Piot and N. Redon and Riley, {M. A.} and J. Simpson and I. Stefanescu and V. Werner and X. Wang and Wood, {J. L.} and Yu, {C. H.} and S. Zhu",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = mar,

day = "26",

doi = "10.1103/PhysRevC.91.034330",

language = "English",

volume = "91",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

Majola, SNT, Hartley, DJ, Riedinger, LL, Sharpey-Schafer, JF, Allmond, JM, Beausang, C, Carpenter, MP, Chiara, CJ, Cooper, N, Curien, D, Gall, BJP, Garrett, PE, Janssens, RVF, Kondev, FG, Kulp, WD, Lauritsen, T, McCutchan, EA, Miller, D, Piot, J, Redon, N, Riley, MA, Simpson, J, Stefanescu, I, Werner, V, Wang, X, Wood, JL, Yu, CH & Zhu, S 2015, 'Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156', Physical Review C - Nuclear Physics, vol. 91, no. 3, 034330. https://doi.org/10.1103/PhysRevC.91.034330

TY - JOUR

T1 - Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156

AU - Majola, S. N.T.

AU - Hartley, D. J.

AU - Riedinger, L. L.

AU - Sharpey-Schafer, J. F.

AU - Allmond, J. M.

AU - Beausang, C.

AU - Carpenter, M. P.

AU - Chiara, C. J.

AU - Cooper, N.

AU - Curien, D.

AU - Gall, B. J.P.

AU - Garrett, P. E.

AU - Janssens, R. V.F.

AU - Kondev, F. G.

AU - Kulp, W. D.

AU - Lauritsen, T.

AU - McCutchan, E. A.

AU - Miller, D.

AU - Piot, J.

AU - Redon, N.

AU - Riley, M. A.

AU - Simpson, J.

AU - Stefanescu, I.

AU - Werner, V.

AU - Wang, X.

AU - Wood, J. L.

AU - Yu, C. H.

AU - Zhu, S.

PY - 2015/3/26

Y1 - 2015/3/26

N2 - The exact nature of the lowest Kπ=2+ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the γ degree of freedom perpendicular to the nuclear symmetry axis. Very few such γ bands have been traced past the usual backbending rotational alignments of high-j nucleons. We have investigated the structure of positive-parity bands in the N=90 nucleus Dy156, using the Nd148(C12,4n)Dy156 reaction at 65 MeV, observing the resulting γ-ray transitions with the Gammasphere array. The even- and odd-spin members of the Kπ=2+γ band are observed up to 32+ and 31+, respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible γ vibration built on the aligned yrast S band are observed up to spins 28+ and 27+. An even-spin positive-parity band, observed up to spin 24+, is a candidate for an aligned S band built on the seniority-zero configuration of the 02+ state at 676 keV. The crossing of this band with the 02+ band is at ?ωc=0.28(1)MeV and is consistent with the configuration of the 02+ band not producing any blocking of the monopole pairing.

AB - The exact nature of the lowest Kπ=2+ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the γ degree of freedom perpendicular to the nuclear symmetry axis. Very few such γ bands have been traced past the usual backbending rotational alignments of high-j nucleons. We have investigated the structure of positive-parity bands in the N=90 nucleus Dy156, using the Nd148(C12,4n)Dy156 reaction at 65 MeV, observing the resulting γ-ray transitions with the Gammasphere array. The even- and odd-spin members of the Kπ=2+γ band are observed up to 32+ and 31+, respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible γ vibration built on the aligned yrast S band are observed up to spins 28+ and 27+. An even-spin positive-parity band, observed up to spin 24+, is a candidate for an aligned S band built on the seniority-zero configuration of the 02+ state at 676 keV. The crossing of this band with the 02+ band is at ?ωc=0.28(1)MeV and is consistent with the configuration of the 02+ band not producing any blocking of the monopole pairing.

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U2 - 10.1103/PhysRevC.91.034330

DO - 10.1103/PhysRevC.91.034330

M3 - Article

AN - SCOPUS:84926049777

SN - 0556-2813

VL - 91

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 3

M1 - 034330

ER -

Observation of γ vibrations and alignments built on non-ground-state configurations in Dy 156

Abstract

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