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. Baba; F. Browne; A. M. Bruce; R. J. Carroll; K. Y. Chae; Zs Dombradi; 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

doi:10.1016/j.physletb.2016.09.058

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 Dombradi, 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

^*Corresponding author for this work

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

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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 J^π=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 K^π=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 N_pN_n 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 language	English
Pages (from-to)	404-408
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	762
DOIs	https://doi.org/10.1016/j.physletb.2016.09.058
Publication status	Published - 10 Nov 2016

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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., ... Xu, Z. Y. (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, 762, 404-408. https://doi.org/10.1016/j.physletb.2016.09.058

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

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−.",

keywords = "Dysprosium, K isomer, Mid-shell, γ-Ray spectroscopy",

author = "S{\"o}derstr{\"o}m, {P. A.} and Walker, {P. M.} and J. Wu and Liu, {H. L.} and Regan, {P. H.} and H. Watanabe and P. Doornenbal and Z. Korkulu and P. Lee and Liu, {J. J.} and G. Lorusso and S. Nishimura and Phong, {V. H.} and T. Sumikama and Xu, {F. R.} and A. Yagi and Zhang, {G. X.} and Ahn, {D. S.} and T. Alharbi and H. Baba and F. Browne and Bruce, {A. M.} and Carroll, {R. J.} and Chae, {K. Y.} and Zs Dombradi and A. Estrade and N. Fukuda and Griffin, {C. J.} and E. Ideguchi and N. Inabe and T. Isobe and H. Kanaoka and S. Kanaya and I. Kojouharov and Kondev, {F. G.} and T. Kubo and S. Kubono and N. Kurz and I. Kuti and S. Lalkovski and Lane, {G. J.} and Lee, {E. J.} and Lee, {C. S.} and G. Lotay and Moon, {C. B.} and I. Nishizuka and Ni{\c t}{\u a}, {C. R.} and A. Odahara and Z. Patel and Zs Podoly{\'a}k and Roberts, {O. J.} and H. Sakurai and H. Schaffner and Shand, {C. M.} and H. Suzuki and H. Takeda and S. Terashima and Zs Vajta and Valiente-D{\`o}bon, {J. J.} and Xu, {Z. Y.}",

note = "Publisher Copyright: {\textcopyright} 2016 The Author(s)",

year = "2016",

month = nov,

day = "10",

doi = "10.1016/j.physletb.2016.09.058",

language = "English",

volume = "762",

pages = "404--408",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

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, Dombradi, Z, 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

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 - Dombradi, Zs

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

UR - http://www.scopus.com/inward/record.url?scp=84991247837&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.09.058

DO - 10.1016/j.physletb.2016.09.058

M3 - Article

SN - 0370-2693

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

ER -

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

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