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Observation of high-$$j$$ quasiparticle states in $$^{249}$$Cm by in-beam $$gamma$$-ray spectroscopy using heavy-ion transfer reactions

重イオン核子移行反応を用いたインビーム$$gamma$$線分光による$$^{249}$$Cmにおける高角運動量の準粒子状態の観測

石井 哲朗  ; 牧井 宏之*; 浅井 雅人  ; 塚田 和明  ; 豊嶋 厚史; 松田 誠  ; 牧嶋 章泰*; 重松 宗一郎*; 金子 順一*; 静間 俊行; 當銘 勇人*; Hossain, I.*; 河野 俊之*; 小川 雅生*

Ishii, Tetsuro; Makii, Hiroyuki*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shigematsu, Soichiro*; Kaneko, Junichi*; Shizuma, Toshiyuki; Tome, Hayato*; Hossain, I.*; Kono, Toshiyuki*; Ogawa, Masao*

We have measured deexcitation $$gamma$$ rays in $$^{249}$$Cm populated by one-neutron stripping reactions with a $$^{248}$$Cm target and a 162 MeV $$^{16}$$O, a 162 MeV $$^{18}$$O, and a 120 MeV $$^{13}$$C beams. $$gamma$$ rays in $$^{249}$$Cm were identified by measuring kinetic energies of outgoing particles using Si $$Delta E$$-$$E$$ detectors. It was demonstrated that high-$$j$$ orbitals were selectively populated in the ($$^{16}$$O,$$^{15}$$O) reaction having a large negative $$Q$$ value. We have observed eight quasi-particle states above the deformed shell gap of $$N=152$$. The 1/2$$^{+}$$[620], 1/2$$^{-}$$[750], and 7/2$$^{+}$$[613] bands were extended up to 19/2$$^{+}$$, 19/2$$^{-}$$, and 13/2$$^{+}$$ states, respectively. We have established the 9/2 9/2$$^{+}$$[615] state at 526 keV, the 9/2 9/2$$^{+}$$[604] state with a short life of $$T_{1/2}ll 2$$ ps at 1030 keV, and the 11/2 11/2$$^{-}$$[725] state with $$T_{1/2}=19(1)$$ ns at 375 keV. Furthermore, the 17/2 1/2$$^{+}$$[880] state, having a large component of the $$k_{17/2}$$ spherical single-particle state, has been identified at 1505 keV. We discuss the properties of those quasi-particle states in the framework of a deformed shell model.

使用言語

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English

掲載資料名

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Physical Review C

巻

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78

号

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5

ページ数

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p.054309_1 - 054309_11

発行年月

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2008/11

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevC.78.054309

研究データの公開先DOI

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使用施設

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タンデム加速器  

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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東京工業大学

Access

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- Accesses

InCites™

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パーセンタイル：64.91

分野：Physics, Nuclear

Altmetrics

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