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Ground-state bands of neutron-rich $$^{236}$$Th and $$^{242}$$U nuclei and implication of spherical shell closure at $$N=164$$

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

The ground-state bands of the neutron-rich $$^{236}$$Th and $$^{242}$$U nuclei were established up to spin 10 and 8, respectively, by in-beam $$gamma$$-ray spectroscopy using the ($$^{18}$$O, $$^{20}$$Ne) two-proton pickup reaction with a $$^{238}$$U and a $$^{244}$$Pu target. Deexcitation $$gamma$$ rays in $$^{236}$$Th and $$^{242}$$U were identified by selecting the kinetic energies of $$^{20}$$Ne using Si $$Delta E$$-$$E$$ detectors. The excitation energies of the first 2$$^{+}$$ states in U and Pu isotopes have local minima at $$N simeq 146$$, suggesting the possibility that nuclei with $$Z simeq 92$$ have a spherical shell closure of $$N=164$$. Calculation using the Koura-Yamada single-particle potential gives an energy gap of 1.8 MeV at $$N=164$$ for $$^{256}$$U.

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Category:Physics, Nuclear

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