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Discovery of $$^{234m}$$Np isomer

Kamada, Hiroki*; Asai, Masato  ; Tsukada, Kazuaki  ; Sato, Tetsuya   ; Toyoshima, Atsushi; Nagame, Yuichiro ; Mitsukai, Akina; Tomitsuka, Tomohiro*; Andreyev, A. N.; Nishio, Katsuhisa   ; Makii, Hiroyuki   ; Hirose, Kentaro  ; Orlandi, R.  ; Osa, Akihiko  ; Shibata, Michihiro*; Sakama, Minoru*; Sato, Daisuke*

Existence of the previously unknown isomer $$^{234m}$$Np was discovered for the first time. $$^{234m}$$Np was produced by using the JAEA tandem accelerator. Short-lived reaction products were mass-separated by the on-line isotope separator ISOL, and $$gamma$$ and X rays originating from the decay of $$^{234m}$$Np were observed. The half-life of $$^{234m}$$Np was determined to be approximately 9 min, and $$^{234m}$$Np was found to decay via the EC decay as well as the isomeric transition. On the basis of the observed $$gamma$$ and X rays and the half-life value, we have evaluated level energy, spin-parity, and proton-neutron configuration of $$^{234m}$$Np.

Language

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Japanese

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Volume

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Number

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Publication Year/Month

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Meeting title

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日本物理学会第73回年次大会

Held date

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2018/03

Location (city)

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野田

Location (country)

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日本

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Keywords

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Np-234; 核異性体; オンライン同位体分離装置

Research Facility

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タンデム加速器  ;第4研究棟  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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名古屋大学; 徳島大学

Accesses

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- Accesses

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