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$$alpha$$-$$gamma$$ spectroscopy of $$^{255}$$No

Asai, Masato  ; Tsukada, Kazuaki  ; Haba, Hiromitsu*; Toyoshima, Atsushi; Ishii, Tetsuro  ; Nagame, Yuichiro ; Nishinaka, Ichiro; Ichikawa, Takatoshi*; Kojima, Yasuaki*; Sueki, Keisuke*

$$gamma$$ rays following the $$alpha$$ decay of $$^{255}$$No have been measured by means of $$alpha$$-$$gamma$$ coincidence spectroscopy to establish neutron single-particle states in odd-mass superheavy nuclei. Seven $$gamma$$ transitions were observed, and excitation energies of the daughter nucleus $$^{251}$$Fm were determined. Spin-parities and neutron single-particle configurations of the excited states in $$^{251}$$Fm as well as the ground state of $$^{255}$$No were identified, and energy spacings and order of neutron single-particle states in N=151 isotones were established. It was found that the N=152 deformed neutron shell gap is larger in Fm and No nuclei than in lighter nuclei of Cf, Cm and Pu, which provides important information to clarify the shell structure of superheavy nuclei.

Language

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Japanese

Journal

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日本物理学会2006年秋季大会(理論核物理,実験核物理,宇宙線・宇宙物理)

Held date

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2006/09

Location (city)

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奈良

Location (country)

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日本

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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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筑波大学

Accesses

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- Accesses

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