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Journal Articles

In-beam $$gamma$$-ray spectroscopy of $$^{240}$$U using the ($$^{18}$$O,$$^{16}$$O) reaction

Ishii, Tetsuro; Shigematsu, Soichiro; Asai, Masato; Makishima, Akiyasu*; Matsuda, Makoto; Kaneko, Junichi*; Hossain, I.*; Ichikawa, Shinichi; Kono, Toshiyuki*; Ogawa, Masao*

Physical Review C, 72(2), p.021301_1 - 021301_5, 2005/08

https://doi.org/10.1103/PhysRevC.72.021301
 Times Cited Count：20 Percentile：76.34(Physics, Nuclear)

In the two-neutron-transfer reaction of a 200-MeV $$^{18}$$O beam with a $$^{238}$$U target, deexcitation $$gamma$$ rays in a neutron-rich nucleus of $$^{240}$$U were measured. The $$gamma$$ rays in $$^{240}$$U were identified by taking coincidence with $$^{16}$$O, using Si $$Delta E$$-$$E$$ detectors. The kinetic energies of $$^{16}$$O particles allowed us to select the excitation energies of $$^{240}$$U below the neutron separation energy. The ground-state band and the $$K^{pi}=0^{-}$$ octupole band of $$^{240}$$U were established up to 12$$^{+}$$ and 9$$^{-}$$, respectively. The octupole-band head of $$^{240}$$U is higher than those of $$^{236,238}$$U by about a hundred keV, suggesting that a secondary maximum of octupole correlations exists at $$N=144-146$$ in U isotopes.

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