Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

T. Ishii, H. Makii, M. Asai, H. Koura, S. Shigematsu, K. Tsukada, A. Toyoshima, M. Matsuda, A. Makishima, J. Kaneko, H. Toume, I. Hossain, T. Shizuma, S. Ichikawa, T. Kohno, M. Ogawa

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Abstract

The ground-state bands of the neutron-rich Th236 and U242 nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the (O18, Ne20) two-proton pickup reaction with a U238 and a Pu244 target. Deexcitation γ rays in Th236 and U242 were identified by selecting the kinetic energies of Ne20 using Si ΔE-E detectors. The excitation energies of the first 2+ states in U and Pu isotopes have local minima at N 146, suggesting the possibility that nuclei with Z 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 U256.

Original languageEnglish
Article number011303
JournalPhysical Review C - Nuclear Physics
Volume76
Issue number1
DOIs
Publication statusPublished - Jul 10 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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