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In-beam $$gamma$$-ray spectroscopy of neutron-rich $$^{245,246}$$Pu and properties of $$N = 152$$ deformed shell closure

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

We have measured in-beam $$gamma$$ rays in the neutron-rich $$^{246}$$Pu$$_{152}$$ and $$^{245}$$Pu$$_{151}$$ nuclei by means of $$^{244}$$Pu($$^{18}$$O, $$^{16}$$O)$$^{246}$$Pu and $$^{244}$$Pu($$^{18}$$O, $$^{17}$$O)$$^{245}$$Pu neutron transfer reactions, respectively. The ground-state band of $$^{246}$$Pu was established up to the $$12^+$$ state. The systematics of the 2$$^+$$ energies for the ground-state bands of Pu isotopes suggests that the $$N = 152$$ deformed shell closure disappears in Pu. The measurement of deexcitation $$gamma$$ rays in $$^{245}$$Pu shows a small energy spacing between the neutron orbitals at $$N = 152$$, which explains the disappearance of the shell closure.

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