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Structure of $^{12}$Be : intruder d-wave strength at N=8

Abstract : The breaking of the N=8 shell-model magic number in the $^{12}$Be 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 $^{12}$Be. The occupancies of the 0hw vp$_{1/2}$ orbital and the 1hw, vd$_{5/2}$ intruder orbital were deduced from a measurement of neutron removal from a high-energy $^{12}$Be beam leading to bound and unbound states in $^{11}$Be.
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Submitted on : Friday, February 17, 2006 - 11:32:49 AM
Last modification on : Thursday, April 23, 2020 - 2:26:21 PM

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S.D. Pain, W.N. Catford, N.A. Orr, J.C. Angélique, N.I. Ashwood, et al.. Structure of $^{12}$Be : intruder d-wave strength at N=8. Physical Review Letters, American Physical Society, 2006, 96, pp.032502. ⟨10.1103/PhysRevLett.96.032502⟩. ⟨in2p3-00025637⟩

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