New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes

M. Rosenbusch; Y. Ito; P. Schury; M. Wada; D. Kaji; K. Morimoto; H. Haba; S. Kimura; H. Koura; M. MacCormick; H. Miyatake; J. Y. Moon; Kosuke Morita; I. Murray; T. Niwase; A. Ozawa; M. Reponen; A. Takamine; T. Tanaka; H. Wollnik

doi:10.1103/PhysRevC.97.064306

New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes

M. Rosenbusch, Y. Ito, P. Schury, M. Wada, D. Kaji, K. Morimoto, H. Haba, S. Kimura, H. Koura, M. MacCormick, H. Miyatake, J. Y. Moon, Kosuke Morita, I. Murray, T. Niwase, A. Ozawa, M. Reponen, A. Takamine, T. Tanaka, H. Wollnik

Experimental Particle Physics

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23 Citations (Scopus)

Abstract

The masses of the exotic isotopes Ac210-214 and Ra210-214 have been measured with a multireflection time-of-flight mass spectrograph. These isotopes were obtained in flight as fusion-evaporation products behind the gas-filled recoil ion separator GARIS-II at RIKEN. The new direct mass measurements serve as an independent and direct benchmark for existing α-γ spectroscopy data in this mass region. Further, new mass anchor points are set for U and Np nuclei close to the N=126 shell closure for a future benchmark of the Z=92 subshell for neutron-deficient heavy isotopes. Our mass results are in general in good agreement with the previously indirectly determined mass values. Together with the measurement data, reasons for possible mass ambiguities from decay-data links between ground states are discussed.

Original language	English
Article number	064306
Journal	Physical Review C
Volume	97
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.97.064306
Publication status	Published - Jun 8 2018

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.97.064306

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Rosenbusch, M., Ito, Y., Schury, P., Wada, M., Kaji, D., Morimoto, K., Haba, H., Kimura, S., Koura, H., MacCormick, M., Miyatake, H., Moon, J. Y., Morita, K., Murray, I., Niwase, T., Ozawa, A., Reponen, M., Takamine, A., Tanaka, T., & Wollnik, H. (2018). New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes. Physical Review C, 97(6), Article 064306. https://doi.org/10.1103/PhysRevC.97.064306

Rosenbusch, M, Ito, Y, Schury, P, Wada, M, Kaji, D, Morimoto, K, Haba, H, Kimura, S, Koura, H, MacCormick, M, Miyatake, H, Moon, JY, Morita, K, Murray, I, Niwase, T, Ozawa, A, Reponen, M, Takamine, A, Tanaka, T & Wollnik, H 2018, 'New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes', Physical Review C, vol. 97, no. 6, 064306. https://doi.org/10.1103/PhysRevC.97.064306

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title = "New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes",

abstract = "The masses of the exotic isotopes Ac210-214 and Ra210-214 have been measured with a multireflection time-of-flight mass spectrograph. These isotopes were obtained in flight as fusion-evaporation products behind the gas-filled recoil ion separator GARIS-II at RIKEN. The new direct mass measurements serve as an independent and direct benchmark for existing α-γ spectroscopy data in this mass region. Further, new mass anchor points are set for U and Np nuclei close to the N=126 shell closure for a future benchmark of the Z=92 subshell for neutron-deficient heavy isotopes. Our mass results are in general in good agreement with the previously indirectly determined mass values. Together with the measurement data, reasons for possible mass ambiguities from decay-data links between ground states are discussed.",

author = "M. Rosenbusch and Y. Ito and P. Schury and M. Wada and D. Kaji and K. Morimoto and H. Haba and S. Kimura and H. Koura and M. MacCormick and H. Miyatake and Moon, {J. Y.} and Kosuke Morita and I. Murray and T. Niwase and A. Ozawa and M. Reponen and A. Takamine and T. Tanaka and H. Wollnik",

note = "Funding Information: We express our gratitude to the RIKEN Nishina Center for Accelerator-based Science and the Center for Nuclear Science at Tokyo University for their support of online measurements. We thank S. Naimi for helpful discussions about the previously measured data. This work was supported by the Japan Society for the Promotion of Science KAKENHI (Grants No. 2200823, No. 24224008, No. 24740142, No. 15H02096, No. 15K05116, No. 17H01081, and No. 17H06090). Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

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AU - Rosenbusch, M.

AU - Ito, Y.

AU - Schury, P.

AU - Wada, M.

AU - Kaji, D.

AU - Morimoto, K.

AU - Haba, H.

AU - Kimura, S.

AU - Koura, H.

AU - MacCormick, M.

AU - Miyatake, H.

AU - Moon, J. Y.

AU - Morita, Kosuke

AU - Murray, I.

AU - Niwase, T.

AU - Ozawa, A.

AU - Reponen, M.

AU - Takamine, A.

AU - Tanaka, T.

AU - Wollnik, H.

N1 - Funding Information: We express our gratitude to the RIKEN Nishina Center for Accelerator-based Science and the Center for Nuclear Science at Tokyo University for their support of online measurements. We thank S. Naimi for helpful discussions about the previously measured data. This work was supported by the Japan Society for the Promotion of Science KAKENHI (Grants No. 2200823, No. 24224008, No. 24740142, No. 15H02096, No. 15K05116, No. 17H01081, and No. 17H06090). Publisher Copyright: © 2018 American Physical Society.

PY - 2018/6/8

Y1 - 2018/6/8

N2 - The masses of the exotic isotopes Ac210-214 and Ra210-214 have been measured with a multireflection time-of-flight mass spectrograph. These isotopes were obtained in flight as fusion-evaporation products behind the gas-filled recoil ion separator GARIS-II at RIKEN. The new direct mass measurements serve as an independent and direct benchmark for existing α-γ spectroscopy data in this mass region. Further, new mass anchor points are set for U and Np nuclei close to the N=126 shell closure for a future benchmark of the Z=92 subshell for neutron-deficient heavy isotopes. Our mass results are in general in good agreement with the previously indirectly determined mass values. Together with the measurement data, reasons for possible mass ambiguities from decay-data links between ground states are discussed.

AB - The masses of the exotic isotopes Ac210-214 and Ra210-214 have been measured with a multireflection time-of-flight mass spectrograph. These isotopes were obtained in flight as fusion-evaporation products behind the gas-filled recoil ion separator GARIS-II at RIKEN. The new direct mass measurements serve as an independent and direct benchmark for existing α-γ spectroscopy data in this mass region. Further, new mass anchor points are set for U and Np nuclei close to the N=126 shell closure for a future benchmark of the Z=92 subshell for neutron-deficient heavy isotopes. Our mass results are in general in good agreement with the previously indirectly determined mass values. Together with the measurement data, reasons for possible mass ambiguities from decay-data links between ground states are discussed.

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New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes

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