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Structure of 12Be: intruder d-wave strength at N=8

S. D. Pain·W. N. Catford·N. A. Orr·J. C. Angelique·N. I. Ashwood·V. Bouchat·N. M. Clarke·N. Curtis·M. Freer·B. R. Fulton·F. Hanappe·M. Labiche·J. L. Lecouey·R. C. Lemmon·D. Mahboub·A. Ninane·G. Normand·N. Soic·L. Stuttge·C. N. Timis·J. A. Tostevin·J. S. Winfield·V. Ziman·.
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Abstract

The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the 0 hbar omega neutron p1/2-orbital and the 1 hbar omega, neutron d5/2 intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.

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S. D. Pain, W. N. Catford, N. A. Orr, J. C. Angelique, N. I. Ashwood, V. Bouchat, N. M. Clarke, N. Curtis, M. Freer, B. R. Fulton, F. Hanappe, M. Labiche, J. L. Lecouey, R. C. Lemmon, D. Mahboub, A. Ninane, G. Normand, N. Soic, L. Stuttge, C. N. Timis, J. A. Tostevin, J. S. Winfield, V. Ziman, .. 2005-10-16. Structure of 12Be: intruder d-wave strength at N=8. https://doi.org/10.1103/physrevlett.96.032502

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