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The halo of $^{14}$Be

Abstract : The two-neutron halo nucleus 14Be has been investigated in a kinematically complete measurement of the fragments (12Be and neutrons) produced in dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal cross-sections, neutron angular distributions and invariant mass spectra characteristic of a halo were observed and the electromagnetic (EMD) contributions deduced. Comparison with three-body model predictions indicate that the halo wavefunction contains a large 2s1/2^2 admixture. The EMD invariant mass spectrum exhibited a relatively narrow structure near threshold (Edecay=1.8+/-0.1 MeV, Gamma = 0.8+/-0.4 MeV) consistent with a soft-dipole excitation.
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Submitted on : Tuesday, April 19, 2005 - 3:13:48 PM
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M. Labiche, N.A. Orr, F.M. Marqués, J.C. Angélique, L. Axelsson, et al.. The halo of $^{14}$Be. Physical Review Letters, American Physical Society, 2001, 86, pp.600-603. ⟨10.1103/PhysRevLett.86.600⟩. ⟨in2p3-00024052⟩



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