K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

P. A. Söderström, P. M. Walker, J. Wu, H. L. Liu, P. H. Regan, H. Watanabe, P. Doornenbal, Z. Korkulu, P. Lee, J. J. Liu, G. Lorusso, S. Nishimura, V. H. Phong, T. Sumikama, F. R. Xu, A. Yagi, G. X. Zhang, D. S. Ahn, T. Alharbi, H. BabaF. Browne, A. M. Bruce, R. J. Carroll, K. Y. Chae, Zs. S. Dombrádi, A. Estrade, N. Fukuda, C. J. Griffin, E. Ideguchi, N. Inabe, T. Isobe, H. Kanaoka, S. Kanaya, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, C. S. Lee, G. Lotay, C. B. Moon, I. Nishizuka, C. R. Niţă, A. Odahara, Z. Patel, Zs Podolyák, O. J. Roberts, H. Sakurai, H. Schaffner, C. M. Shand, H. Suzuki, H. Takeda, S. Terashima, Zs Vajta, J. J. Valiente-Dòbon, Z. Y. Xu

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Abstract

A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2 state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2.

Original languageEnglish
Pages (from-to)404-408
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume762
DOIs
Publication statusPublished - Nov 10 2016

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nuclides
parity
half life
nuclei
isomers
vibration
decay
elementary excitations
ground state
energy
excitation

Keywords

  • Dysprosium
  • K isomer
  • Mid-shell
  • γ-Ray spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy. / Söderström, P. A.; Walker, P. M.; Wu, J.; Liu, H. L.; Regan, P. H.; Watanabe, H.; Doornenbal, P.; Korkulu, Z.; Lee, P.; Liu, J. J.; Lorusso, G.; Nishimura, S.; Phong, V. H.; Sumikama, T.; Xu, F. R.; Yagi, A.; Zhang, G. X.; Ahn, D. S.; Alharbi, T.; Baba, H.; Browne, F.; Bruce, A. M.; Carroll, R. J.; Chae, K. Y.; Dombrádi, Zs. S.; Estrade, A.; Fukuda, N.; Griffin, C. J.; Ideguchi, E.; Inabe, N.; Isobe, T.; Kanaoka, H.; Kanaya, S.; Kojouharov, I.; Kondev, F. G.; Kubo, T.; Kubono, S.; Kurz, N.; Kuti, I.; Lalkovski, S.; Lane, G. J.; Lee, E. J.; Lee, C. S.; Lotay, G.; Moon, C. B.; Nishizuka, I.; Niţă, C. R.; Odahara, A.; Patel, Z.; Podolyák, Zs; Roberts, O. J.; Sakurai, H.; Schaffner, H.; Shand, C. M.; Suzuki, H.; Takeda, H.; Terashima, S.; Vajta, Zs; Valiente-Dòbon, J. J.; Xu, Z. Y.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 762, 10.11.2016, p. 404-408.

Research output: Contribution to journalArticle

Söderström, PA, Walker, PM, Wu, J, Liu, HL, Regan, PH, Watanabe, H, Doornenbal, P, Korkulu, Z, Lee, P, Liu, JJ, Lorusso, G, Nishimura, S, Phong, VH, Sumikama, T, Xu, FR, Yagi, A, Zhang, GX, Ahn, DS, Alharbi, T, Baba, H, Browne, F, Bruce, AM, Carroll, RJ, Chae, KY, Dombrádi, ZS, Estrade, A, Fukuda, N, Griffin, CJ, Ideguchi, E, Inabe, N, Isobe, T, Kanaoka, H, Kanaya, S, Kojouharov, I, Kondev, FG, Kubo, T, Kubono, S, Kurz, N, Kuti, I, Lalkovski, S, Lane, GJ, Lee, EJ, Lee, CS, Lotay, G, Moon, CB, Nishizuka, I, Niţă, CR, Odahara, A, Patel, Z, Podolyák, Z, Roberts, OJ, Sakurai, H, Schaffner, H, Shand, CM, Suzuki, H, Takeda, H, Terashima, S, Vajta, Z, Valiente-Dòbon, JJ & Xu, ZY 2016, 'K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 762, pp. 404-408. https://doi.org/10.1016/j.physletb.2016.09.058
Söderström, P. A. ; Walker, P. M. ; Wu, J. ; Liu, H. L. ; Regan, P. H. ; Watanabe, H. ; Doornenbal, P. ; Korkulu, Z. ; Lee, P. ; Liu, J. J. ; Lorusso, G. ; Nishimura, S. ; Phong, V. H. ; Sumikama, T. ; Xu, F. R. ; Yagi, A. ; Zhang, G. X. ; Ahn, D. S. ; Alharbi, T. ; Baba, H. ; Browne, F. ; Bruce, A. M. ; Carroll, R. J. ; Chae, K. Y. ; Dombrádi, Zs. S. ; Estrade, A. ; Fukuda, N. ; Griffin, C. J. ; Ideguchi, E. ; Inabe, N. ; Isobe, T. ; Kanaoka, H. ; Kanaya, S. ; Kojouharov, I. ; Kondev, F. G. ; Kubo, T. ; Kubono, S. ; Kurz, N. ; Kuti, I. ; Lalkovski, S. ; Lane, G. J. ; Lee, E. J. ; Lee, C. S. ; Lotay, G. ; Moon, C. B. ; Nishizuka, I. ; Niţă, C. R. ; Odahara, A. ; Patel, Z. ; Podolyák, Zs ; Roberts, O. J. ; Sakurai, H. ; Schaffner, H. ; Shand, C. M. ; Suzuki, H. ; Takeda, H. ; Terashima, S. ; Vajta, Zs ; Valiente-Dòbon, J. J. ; Xu, Z. Y. / K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2016 ; Vol. 762. pp. 404-408.
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abstract = "A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−.",
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TY - JOUR

T1 - K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

AU - Söderström, P. A.

AU - Walker, P. M.

AU - Wu, J.

AU - Liu, H. L.

AU - Regan, P. H.

AU - Watanabe, H.

AU - Doornenbal, P.

AU - Korkulu, Z.

AU - Lee, P.

AU - Liu, J. J.

AU - Lorusso, G.

AU - Nishimura, S.

AU - Phong, V. H.

AU - Sumikama, T.

AU - Xu, F. R.

AU - Yagi, A.

AU - Zhang, G. X.

AU - Ahn, D. S.

AU - Alharbi, T.

AU - Baba, H.

AU - Browne, F.

AU - Bruce, A. M.

AU - Carroll, R. J.

AU - Chae, K. Y.

AU - Dombrádi, Zs. S.

AU - Estrade, A.

AU - Fukuda, N.

AU - Griffin, C. J.

AU - Ideguchi, E.

AU - Inabe, N.

AU - Isobe, T.

AU - Kanaoka, H.

AU - Kanaya, S.

AU - Kojouharov, I.

AU - Kondev, F. G.

AU - Kubo, T.

AU - Kubono, S.

AU - Kurz, N.

AU - Kuti, I.

AU - Lalkovski, S.

AU - Lane, G. J.

AU - Lee, E. J.

AU - Lee, C. S.

AU - Lotay, G.

AU - Moon, C. B.

AU - Nishizuka, I.

AU - Niţă, C. R.

AU - Odahara, A.

AU - Patel, Z.

AU - Podolyák, Zs

AU - Roberts, O. J.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Shand, C. M.

AU - Suzuki, H.

AU - Takeda, H.

AU - Terashima, S.

AU - Vajta, Zs

AU - Valiente-Dòbon, J. J.

AU - Xu, Z. Y.

PY - 2016/11/10

Y1 - 2016/11/10

N2 - A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−.

AB - A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−.

KW - Dysprosium

KW - K isomer

KW - Mid-shell

KW - γ-Ray spectroscopy

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U2 - 10.1016/j.physletb.2016.09.058

DO - 10.1016/j.physletb.2016.09.058

M3 - Article

AN - SCOPUS:84991247837

VL - 762

SP - 404

EP - 408

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -