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

Physics

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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
State	Published - Nov 10 2016

Keywords

Dysprosium
K isomer
Mid-shell
γ-Ray spectroscopy

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10.1016/j.physletb.2016.09.058

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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

@article{b847285ac4b54b8298af784adfb859aa,

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",

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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

AN - SCOPUS:84991247837

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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Keywords

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