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$$alpha$$-$$gamma$$(e) spectroscopy of $$^{261}$$Rf and $$^{257}$$No

$$^{261}$$Rf, $$^{257}$$Noの$$alpha$$-$$gamma$$(e)核分光

浅井 雅人  

Asai, Masato

$$^{261}$$Rf,$$^{257}$$Noの$$alpha$$崩壊に伴う$$gamma$$線及び内部転換電子を$$alpha$$-$$gamma$$, $$alpha$$-e同時計数法により測定することで、準位のスピン・パリティを決定し、超重核の殻構造に関する情報を得た。$$^{257}$$Noの基底状態及び$$^{253}$$Fmの124.1keV準位の中性子軌道配位を3/2[622]と同定し、$$^{257}$$Noの基底状態の配位が同じ中性子数155の軽い核の配位と異なることを明らかにした。$$^{261}$$Rfの基底状態の配位についても、$$alpha$$-$$gamma$$同時計数測定の結果をもとに議論した。

$$alpha$$-$$gamma$$ and $$alpha$$-electron coincidence spectroscopy for the $$alpha$$ decay of $$^{261}$$Rf and $$^{257}$$No has been performed to study shell structure of superheavy nuclei through experimental spin-parity assignments. The neutron single-particle configuration of 3/2[622] has been assigned to the ground state of $$^{257}$$No as well as to the 124.1 keV level in $$^{253}$$Fm. It was found that the ground state configuration of $$^{257}$$No is different from that of lighter N=155 isotones. The ground state configuration of $$^{261}$$Rf is also discussed on the basis of the $$alpha$$-$$gamma$$ coincidence results for $$^{261}$$Rf.

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