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In-beam $$gamma$$-ray spectroscopy of more neutron-rich nuclei than the $$beta$$-stability line in the U region; $$^{236}$$Th, $$^{240,242}$$U, $$^{246}$$Pu, $$^{250}$$Cm

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

The ground-state bands of $$^{236}$$Th,$$^{240,242}$$U, $$^{246}$$Pu and $$^{250}$$Cm were established by measuring deexcitation $$gamma$$ rays. These nuclei were produced by the ($$^{18}$$O, $$^{16}$$O) and ($$^{18}$$O, $$^{20}$$Ne) two-nucleon transfer reactions with $$^{238}$$U, $$^{244}$$Pu and $$^{248}$$Cm targets. The $$gamma$$ rays in residual nuclei were identified by taking coincidence with scattering particles using high-resolution Si $$Delta E$$-$$E$$ detectors. By extending the systematics of the 2$$_{1}^{+}$$ energies into neutron-rich nuclei, we have found that the $$N=152$$ deformed shell gap disappears at $$_{94}$$Pu isotopes and that U and Pu isotopes have the possibility of the spherical shell closure at $$N=164$$.

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English

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Meeting title

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3rd International Conference on the Chemistry and Physics of the Transactinide Elements (TAN '07)

Held date

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2007/09

Location (city)

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Davos

Location (country)

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Switzerland

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DOI for research data

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Keywords

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no keyword

Research Facility

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タンデム加速器  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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東京工業大学

Accesses

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- Accesses

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