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Triaxial deformation in 10Be

N. Itagaki1,*, S. Hirose1, T. Otsuka1,2, S. Okabe3, and K. Ikeda2

  • 1Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
  • 2The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
  • 3Center for Information and Multimedia Studies, Hokkaido University, Sapporo 060-0810, Japan

  • *Electronic address: itagaki@phys.s.u-tokyo.ac.jp
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Phys. Rev. C 65, 044302 – Published 11 March, 2002

DOI: https://doi.org/10.1103/PhysRevC.65.044302

Abstract

The triaxial deformation in 10Be is investigated using a microscopic α+α+n+n model. The states of two valence neutrons are classified based on the molecular-orbit (MO) model, and the π orbit is introduced about the axis connecting the two α clusters for the description of the rotational bands. There appear two rotational bands comprised mainly of Kπ=0+ and Kπ=2+, respectively, at low excitation energy, where the two valence neutrons occupy Kπ=3/2− or Kπ=1/2− orbits. The triaxiality and the K mixing are discussed in connection to the molecular structure, particularly to the spin-orbit splitting. The extent of the triaxial deformation is evaluated in terms of the electromagnetic transition matrix elements (Davydov-Filippov model, Q-invariant model) and density distribution in the intrinsic frame. The obtained values turned out to be γ=15°–20°.

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Phys. Rev. C 65, 044302– Published 11 March, 2002
  • Received 15 September 2001

© 2002 American Physical Society

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