Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer

Z. Patel; Zs Podolyák; P. M. Walker; P. H. Regan; P. A. Söderström; H. Watanabe; E. Ideguchi; G. S. Simpson; S. Nishimura; F. Browne; P. Doornenbal; G. Lorusso; S. Rice; L. Sinclair; T. Sumikama; J. Wu; Z. Y. Xu; N. Aoi; H. Baba; F. L. Bello Garrote; G. Benzoni; R. Daido; Zs Dombrádi; Y. Fang; N. Fukuda; G. Gey; S. Go; A. Gottardo; N. Inabe; T. Isobe; D. Kameda; K. Kobayashi; M. Kobayashi; T. Komatsubara; I. Kojouharov; T. Kubo; N. Kurz; I. Kuti; Z. Li; H. L. Liu; M. Matsushita; S. Michimasa; C. B. Moon; H. Nishibata; I. Nishizuka; A. Odahara; E. Şahin; H. Sakurai; H. Schaffner; H. Suzuki; H. Takeda; M. Tanaka; J. Taprogge; Zs Vajta; F. R. Xu; A. Yagi; R. Yokoyama

doi:10.1016/j.physletb.2015.12.026

Decay spectroscopy of ¹⁶⁰Sm: The lightest four-quasiparticle K isomer

Z. Patel, Zs Podolyák, P. M. Walker, P. H. Regan, P. A. Söderström, H. Watanabe, E. Ideguchi, G. S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z. Y. Xu, N. Aoi, H. Baba, F. L. Bello GarroteG. Benzoni, R. Daido, Zs Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, H. L. Liu, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, E. Şahin, H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs Vajta, F. R. Xu, A. Yagi, R. Yokoyama

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Abstract

The decay of a new four-quasiparticle isomeric state in ¹⁶⁰Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π5/2^-[532], π5/2⁺[413], ν5/2^-[523], ν7/2⁺[633] configuration. The half-life of this (11⁺) state is measured to be 1.8(4) μs. The (11⁺) isomer decays into a rotational band structure, based on a (6^-) ν5/2^-[523]⊗ν7/2⁺[633] bandhead, consistent with the g_K-g_R values. This decays to a (5^-) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around ¹⁶⁰Sm. They reveal a significant influence from β₆ deformation and that ¹⁶⁰Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from ¹⁶⁰Sm. The E1 data are found to agree with the existing relationship for E2 transitions.

Original language	English
Pages (from-to)	182-186
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	753
DOIs	https://doi.org/10.1016/j.physletb.2015.12.026
Publication status	Published - Feb 10 2016
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2015.12.026

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Patel, Z., Podolyák, Z., Walker, P. M., Regan, P. H., Söderström, P. A., Watanabe, H., Ideguchi, E., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Lorusso, G., Rice, S., Sinclair, L., Sumikama, T., Wu, J., Xu, Z. Y., Aoi, N., Baba, H., ... Yokoyama, R. (2016). Decay spectroscopy of ¹⁶⁰Sm: The lightest four-quasiparticle K isomer. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 753, 182-186. https://doi.org/10.1016/j.physletb.2015.12.026

Patel, Z, Podolyák, Z, Walker, PM, Regan, PH, Söderström, PA, Watanabe, H, Ideguchi, E, Simpson, GS, Nishimura, S, Browne, F, Doornenbal, P, Lorusso, G, Rice, S, Sinclair, L, Sumikama, T, Wu, J, Xu, ZY, Aoi, N, Baba, H, Bello Garrote, FL, Benzoni, G, Daido, R, Dombrádi, Z, Fang, Y, Fukuda, N, Gey, G, Go, S, Gottardo, A, Inabe, N, Isobe, T, Kameda, D, Kobayashi, K, Kobayashi, M, Komatsubara, T, Kojouharov, I, Kubo, T, Kurz, N, Kuti, I, Li, Z, Liu, HL, Matsushita, M, Michimasa, S, Moon, CB, Nishibata, H, Nishizuka, I, Odahara, A, Şahin, E, Sakurai, H, Schaffner, H, Suzuki, H, Takeda, H, Tanaka, M, Taprogge, J, Vajta, Z, Xu, FR, Yagi, A & Yokoyama, R 2016, 'Decay spectroscopy of ¹⁶⁰Sm: The lightest four-quasiparticle K isomer', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 753, pp. 182-186. https://doi.org/10.1016/j.physletb.2015.12.026

@article{3b626514148f4704ba82af1972801912,

title = "Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer",

abstract = "The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π5/2-[532], π5/2+[413], ν5/2-[523], ν7/2+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6-) ν5/2-[523]⊗ν7/2+[633] bandhead, consistent with the gK-gR values. This decays to a (5-) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.",

author = "Z. Patel and Zs Podoly{\'a}k and Walker, {P. M.} and Regan, {P. H.} and S{\"o}derstr{\"o}m, {P. A.} and H. Watanabe and E. Ideguchi and Simpson, {G. S.} and S. Nishimura and F. Browne and P. Doornenbal and G. Lorusso and S. Rice and L. Sinclair and T. Sumikama and J. Wu and Xu, {Z. Y.} and N. Aoi and H. Baba and {Bello Garrote}, {F. L.} and G. Benzoni and R. Daido and Zs Dombr{\'a}di and Y. Fang and N. Fukuda and G. Gey and S. Go and A. Gottardo and N. Inabe and T. Isobe and D. Kameda and K. Kobayashi and M. Kobayashi and T. Komatsubara and I. Kojouharov and T. Kubo and N. Kurz and I. Kuti and Z. Li and Liu, {H. L.} and M. Matsushita and S. Michimasa and Moon, {C. B.} and H. Nishibata and I. Nishizuka and A. Odahara and E. {\c S}ahin and H. Sakurai and H. Schaffner and H. Suzuki and H. Takeda and M. Tanaka and J. Taprogge and Zs Vajta and Xu, {F. R.} and A. Yagi and R. Yokoyama",

note = "Funding Information: This work was carried out at the RIBF operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. All UK authors are supported by STFC . P.H.R. and G.L. are partially supported by the UK National Measurement Office (NMO). P.-A.S. was financed by JSPS Grant Number 23.01752 and the RIKEN Foreign Postdoctoral Researcher Program. J.T. was financed by Spanish Ministerio de Ciencia e Innovaci{\'o}n under Contracts No. FPA2009-13377-C02 and No. FPA2011-29854-C04 . Zs.D., I.K., and Zs.V. were supported by OTKA contract number K100835 . We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by JSPS KAKENHI Grant No. 25247045 . Publisher Copyright: {\textcopyright} 2015 .",

year = "2016",

month = feb,

day = "10",

doi = "10.1016/j.physletb.2015.12.026",

language = "English",

volume = "753",

pages = "182--186",

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

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Decay spectroscopy of 160Sm

T2 - The lightest four-quasiparticle K isomer

AU - Patel, Z.

AU - Podolyák, Zs

AU - Walker, P. M.

AU - Regan, P. H.

AU - Söderström, P. A.

AU - Watanabe, H.

AU - Ideguchi, E.

AU - Simpson, G. S.

AU - Nishimura, S.

AU - Browne, F.

AU - Doornenbal, P.

AU - Lorusso, G.

AU - Rice, S.

AU - Sinclair, L.

AU - Sumikama, T.

AU - Wu, J.

AU - Xu, Z. Y.

AU - Aoi, N.

AU - Baba, H.

AU - Bello Garrote, F. L.

AU - Benzoni, G.

AU - Daido, R.

AU - Dombrádi, Zs

AU - Fang, Y.

AU - Fukuda, N.

AU - Gey, G.

AU - Go, S.

AU - Gottardo, A.

AU - Inabe, N.

AU - Isobe, T.

AU - Kameda, D.

AU - Kobayashi, K.

AU - Kobayashi, M.

AU - Komatsubara, T.

AU - Kojouharov, I.

AU - Kubo, T.

AU - Kurz, N.

AU - Kuti, I.

AU - Li, Z.

AU - Liu, H. L.

AU - Matsushita, M.

AU - Michimasa, S.

AU - Moon, C. B.

AU - Nishibata, H.

AU - Nishizuka, I.

AU - Odahara, A.

AU - Şahin, E.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Suzuki, H.

AU - Takeda, H.

AU - Tanaka, M.

AU - Taprogge, J.

AU - Vajta, Zs

AU - Xu, F. R.

AU - Yagi, A.

AU - Yokoyama, R.

N1 - Funding Information: This work was carried out at the RIBF operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. All UK authors are supported by STFC . P.H.R. and G.L. are partially supported by the UK National Measurement Office (NMO). P.-A.S. was financed by JSPS Grant Number 23.01752 and the RIKEN Foreign Postdoctoral Researcher Program. J.T. was financed by Spanish Ministerio de Ciencia e Innovación under Contracts No. FPA2009-13377-C02 and No. FPA2011-29854-C04 . Zs.D., I.K., and Zs.V. were supported by OTKA contract number K100835 . We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by JSPS KAKENHI Grant No. 25247045 . Publisher Copyright: © 2015 .

PY - 2016/2/10

Y1 - 2016/2/10

N2 - The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π5/2-[532], π5/2+[413], ν5/2-[523], ν7/2+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6-) ν5/2-[523]⊗ν7/2+[633] bandhead, consistent with the gK-gR values. This decays to a (5-) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.

AB - The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π5/2-[532], π5/2+[413], ν5/2-[523], ν7/2+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6-) ν5/2-[523]⊗ν7/2+[633] bandhead, consistent with the gK-gR values. This decays to a (5-) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.

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U2 - 10.1016/j.physletb.2015.12.026

DO - 10.1016/j.physletb.2015.12.026

M3 - Article

AN - SCOPUS:84949894960

SN - 0370-2693

VL - 753

SP - 182

EP - 186

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 -

Decay spectroscopy of ¹⁶⁰Sm: The lightest four-quasiparticle K isomer

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