Isomer spectroscopy of neutron-rich 168Tb103

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

doi:10.1016/j.radphyschem.2016.12.011

Isomer spectroscopy of neutron-rich ¹⁶⁸Tb₁₀₃

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

Physics

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Abstract

In-flight fission of a 345 MeV per nucleon ²³⁸U primary beam on a 2 mm thick ⁹Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus ¹⁷⁰Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr₃) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus ¹⁶⁸Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus ¹⁷⁰Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the ¹⁶⁸Tb ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.

Original language	English
Pages (from-to)	493-496
Number of pages	4
Journal	Radiation Physics and Chemistry
Volume	140
DOIs	https://doi.org/10.1016/j.radphyschem.2016.12.011
State	Published - Nov 2017

Keywords

Gamma-ray spectroscopy and nuclear isomerism
Nuclear energy-level schemes
Possible two-quasiparticle configurations
Structure of neutron-rich Terbium radioisotopes

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10.1016/j.radphyschem.2016.12.011

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Gurgi, L. A., Regan, P. H., Söderström, P. A., Watanabe, H., Walker, P. M., Podolyák, Z., Nishimura, S., Berry, T. A., Doornenbal, P., Lorusso, G., Isobe, T., Baba, H., Xu, Z. Y., Sakurai, H., Sumikama, T., Catford, W. N., Bruce, A. M., Browne, F., Lane, G. J., ... Valiente-Dòbon, J. J. (2017). Isomer spectroscopy of neutron-rich ¹⁶⁸Tb₁₀₃ Radiation Physics and Chemistry, 140, 493-496. https://doi.org/10.1016/j.radphyschem.2016.12.011

@article{cd0b15f192a542aabc0c9b79cacf34f6,

title = "Isomer spectroscopy of neutron-rich 168Tb103 ",

abstract = "In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus 168Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus 170Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the 168Tb ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.",

keywords = "Gamma-ray spectroscopy and nuclear isomerism, Nuclear energy-level schemes, Possible two-quasiparticle configurations, Structure of neutron-rich Terbium radioisotopes",

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

note = "Publisher Copyright: {\textcopyright} 2017 The Authors",

year = "2017",

month = nov,

doi = "10.1016/j.radphyschem.2016.12.011",

language = "English",

volume = "140",

pages = "493--496",

journal = "Radiation Physics and Chemistry",

issn = "0969-806X",

publisher = "Radiation Physics and Chemistry",

}

Gurgi, LA, Regan, PH, Söderström, PA, Watanabe, H, Walker, PM, Podolyák, Z, Nishimura, S, Berry, TA, Doornenbal, P, Lorusso, G, Isobe, T, Baba, H, Xu, ZY, Sakurai, H, Sumikama, T, Catford, WN, Bruce, AM, Browne, F, Lane, GJ, Kondev, FG, Odahara, A, Wu, J, Liu, HL, Xu, FR, Korkulu, Z, Lee, P, Liu, JJ, Phong, VH, Yag, A, Zhang, GX, Alharbi, T, Carroll, RJ, Chae, KY, Dombradi, Z, Estrade, A, Fukuda, N, Griffin, C, Ideguchi, E, Inabe, N, Kanaoka, H, Kojouharov, I, Kubo, T, Kubono, S, Kurz, N, Kuti, I, Lalkovski, S, Lee, EJ, Lee, CS, Lotay, G, Moon, CB, Nishizuka, I, Nita, CR, Patel, Z, Roberts, OJ, Schaffner, H, Shand, CM, Suzuki, H, Takeda, H, Terashima, S, Vajta, Z, Yoshida, S & Valiente-Dòbon, JJ 2017, 'Isomer spectroscopy of neutron-rich ¹⁶⁸Tb₁₀₃ ', Radiation Physics and Chemistry, vol. 140, pp. 493-496. https://doi.org/10.1016/j.radphyschem.2016.12.011

TY - JOUR

T1 - Isomer spectroscopy of neutron-rich 168Tb103

AU - Gurgi, L. A.

AU - Regan, P. H.

AU - Söderström, P. A.

AU - Watanabe, H.

AU - Walker, P. M.

AU - Podolyák, Zs

AU - Nishimura, S.

AU - Berry, T. A.

AU - Doornenbal, P.

AU - Lorusso, G.

AU - Isobe, T.

AU - Baba, H.

AU - Xu, Z. Y.

AU - Sakurai, H.

AU - Sumikama, T.

AU - Catford, W. N.

AU - Bruce, A. M.

AU - Browne, F.

AU - Lane, G. J.

AU - Kondev, F. G.

AU - Odahara, A.

AU - Wu, J.

AU - Liu, H. L.

AU - Xu, F. R.

AU - Korkulu, Z.

AU - Lee, P.

AU - Liu, J. J.

AU - Phong, V. H.

AU - Yag, A.

AU - Zhang, G. X.

AU - Alharbi, T.

AU - Carroll, R. J.

AU - Chae, K. Y.

AU - Dombradi, Zs

AU - Estrade, A.

AU - Fukuda, N.

AU - Griffin, C.

AU - Ideguchi, E.

AU - Inabe, N.

AU - Kanaoka, H.

AU - Kojouharov, I.

AU - Kubo, T.

AU - Kubono, S.

AU - Kurz, N.

AU - Kuti, I.

AU - Lalkovski, S.

AU - Lee, E. J.

AU - Lee, C. S.

AU - Lotay, G.

AU - Moon, C. B.

AU - Nishizuka, I.

AU - Nita, C. R.

AU - Patel, Z.

AU - Roberts, O. J.

AU - Schaffner, H.

AU - Shand, C. M.

AU - Suzuki, H.

AU - Takeda, H.

AU - Terashima, S.

AU - Vajta, Zs

AU - Yoshida, S.

AU - Valiente-Dòbon, J. J.

PY - 2017/11

Y1 - 2017/11

N2 - In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus 168Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus 170Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the 168Tb ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.

AB - In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event-by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus 168Tb, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus 170Dy. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the 168Tb ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.

KW - Gamma-ray spectroscopy and nuclear isomerism

KW - Nuclear energy-level schemes

KW - Possible two-quasiparticle configurations

KW - Structure of neutron-rich Terbium radioisotopes

UR - http://www.scopus.com/inward/record.url?scp=85009177515&partnerID=8YFLogxK

U2 - 10.1016/j.radphyschem.2016.12.011

DO - 10.1016/j.radphyschem.2016.12.011

M3 - Article

AN - SCOPUS:85009177515

SN - 0969-806X

VL - 140

SP - 493

EP - 496

JO - Radiation Physics and Chemistry

JF - Radiation Physics and Chemistry

ER -

Isomer spectroscopy of neutron-rich ¹⁶⁸Tb₁₀₃

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