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Energies of the first-excited 2$$^{+}$$ states in even-even actinide nuclei

Asai, Masato  ; Tsukada, Kazuaki  ; Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Sato, Tetsuya   ; Nagame, Yuichiro ; Sato, Nozomi; Ishii, Tetsuro  

Energies of the first-excited states in even-even actinide nuclei were determined precisely through high-resolution $$alpha$$-particle measurements and $$alpha$$-$$gamma$$ coincidence measurements. Those energies were measured for a total of 8 isotopes in Pu, Cm, Cf and Fm, and dependences of those energies on the proton and neutron numbers were systematically clarified. It was found that the energy of the first-excited state takes the minimum around Cm and Cf isotopes, and increases with increasing atomic number. This trend was qualitatively explained by taking account of the existence of the spherical closed shell at the proton number $$Z=114$$. It was also found that the first-excited state takes the local minimum at $$^{252}$$Fm, which clearly indicates the existence of the doubly deformed shell gaps at $$Z=100$$ and $$N=152$$.

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