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$$alpha$$-$$gamma$$ coincidence spectroscopy of $$^{259}$$Rf using a mixed Cf target

Asai, Masato  ; Tsukada, Kazuaki  ; Kasamatsu, Yoshitaka*; Sato, Tetsuya   ; Toyoshima, Atsushi; Ishii, Yasuo; Takahashi, Ryuta; Nagame, Yuichiro ; Ishii, Tetsuro  ; Nishinaka, Ichiro; Kaji, Daiya*; Morimoto, Koji*; Kojima, Yasuaki*

$$gamma$$ rays following the $$alpha$$ decay of $$^{259}$$Rf have been observed for the first time by means of $$alpha$$-$$gamma$$ coincidence spectroscopy. $$^{259}$$Rf was produced via the $$^{251}$$Cf($$^{12}$$C,4n)$$^{259}$$Rf reaction at the JAEA tandem accelerator. Two $$gamma$$ lines were observed at 97.3 and 146.7 keV in coincidence with the 8770 keV $$alpha$$ transition of $$^{259}$$Rf. The energy differences and intensities of these $$gamma$$ transitions, which are very similar to those in the $$alpha$$ decay of $$^{257}$$No with the same neutron number N = 155, allow us to assign the 3/2$$^{+}$$[622] configuration to the 146.7 keV level in $$^{255}$$No as well as to the ground state of $$^{259}$$Rf. This result indicates that the order of neutron orbitals should be inverted between $$^{255}$$Fm and $$^{257}$$No in $$N=155$$ isotones.

Language

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English

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3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (Hawaii 2009)

Held date

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2009/10

Location (city)

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Waikoloa

Location (country)

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U.S.A.

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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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広島大学; 理化学研究所

Accesses

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- Accesses

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