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Covalent isomeric state in Be12 induced by two-neutron transfers

M. Ito and N. Itagaki
Phys. Rev. C 78, 011602(R) – Published 18 July 2008
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Abstract

The α+He8 low-energy reactions and the exotic structures of Be12 are studied using the generalized two-center cluster (α+α+4N) model. In the two-neutron transfer reactions, α+He8g.s.He6g.s.+He6g.s., a resonant peak with Jπ=0+ appears around E~ 1.3 MeV above the He6g.s.+He6g.s. threshold as the result of the formation of the covalent superdeformation, which has a hybrid structure of covalent and ionic configurations for the valence neutrons. The covalent superdeformation gives rise to an isomeric state with a sharp width of Γ~400 keV, which is smaller by about one order of magnitude than the typical width observed in molecular resonances above the Coulomb barrier. The energy-spin systematics for the two-neutron transfer reactions is investigated, and our calculation predicts a sequence of resonant structures in the range of 3–14 MeV in the center-of-mass energy with spins 08.

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  • Received 8 May 2008

DOI:https://doi.org/10.1103/PhysRevC.78.011602

©2008 American Physical Society

Authors & Affiliations

M. Ito1 and N. Itagaki2

  • 1RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, 351-0198 Saitama, Japan
  • 2Department of Physics, University of Tokyo, Hongo, 113-0033 Tokyo, Japan

See Also

Nuclear Chemistry

Don Monroe
Phys. Rev. Focus 22, 4 (2008)

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Vol. 78, Iss. 1 — July 2008

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