Structure of the mirror nuclei Be9 and B9 in a microscopic cluster model

K. Arai, Y. Ogawa, Y. Suzuki, and K. Varga
Phys. Rev. C 54, 132 – Published 1 July 1996
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Abstract

The structure of the mirror nuclei Be9 and B9 is studied in a microscopic α+α+n and α+α+p three-cluster model using a fully antisymmetrized nine-nucleon wave function. The two-nucleon interaction includes central and spin-orbit components together with the Coulomb potential. The ground state of Be9 is obtained accurately with the stochastic variational method, while several particle-unbound states of both Be9 and B9 are investigated with the complex scaling method. The calculation for Be9 supports the recent identification for the existence of two broad states around 6.5 MeV, and predicts the 3/22 and 5/22 states at about 4.5 MeV and 8 MeV, respectively. The similarity of the calculated spectra of Be9 and B9 enables one to identify unknown spins and parities of the B9 states. Available data on electromagnetic moments and elastic electron scatterings are reproduced very well. The enhancement of the E1 transition of the first excited state in Be9 is well accounted for. The calculated density of Be9 is found to reproduce the reaction cross section on a carbon target. The analysis of the beta decay of Li9 to Be9 clearly shows that the wave function of Be9 must contain a small component that cannot be described by the simple α+α+n model. This small component can be well accounted for by extending a configuration space to include the distortion of the α particle to t+p and h+n partitions. © 1996 The American Physical Society.

  • Received 4 March 1996

DOI:https://doi.org/10.1103/PhysRevC.54.132

©1996 American Physical Society

Authors & Affiliations

K. Arai, Y. Ogawa, Y. Suzuki, and K. Varga

  • Graduate School of Science and Technology, Niigata University, Niigata 950-21, Japan
  • RIKEN, Hirosawa, Wako, Saitama 351-01 Japan
  • Department of Physics, Niigata University, Niigata 950-21, Japan
  • Institute of Nuclear Research of the Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary

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Vol. 54, Iss. 1 — July 1996

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