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26 April 2024

» arxiv » nucl-ex/0006003

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The Halo of 14Be
M. Labiche ; N.A. Orr ; F.M. Marques ; J.C. Angelique ; L. Axelsson ; B. Benoit ; U.C. Bergmann ; M.J.G. Borge ; W.N. Catford ; S.P.G. Chappell ; N.M. Clarke ; G. Costa ; N. Curtis ; A. D’Arrigo ; E. de Goes Brennand ; O. Dorvaux ; G. Fazio ; M. Freer ; B.R. Fulton ; G. Giardina ; S. Grevy ; D. Guillemaud-Mueller ; F. Hanappe ; B. Heusch K.L. Jones ; B. Jonson ; C. Le Brun ; S. Leenhardt ; M. Lewitowicz ; M.J. Lopez ; K. Markenroth ; A.C. Mueller ; T. Nilsson ; A. Ninane ; G. Nyman ; F. de Oliveira ; I. Piqueras ; K. Riisager ; M.G. Saint Laurent ; F. Sarazin ; S.M. Singer ; O. Sorlin ; L. Stuttge ;
Date:	7 Jun 2000
Subject:	nucl-ex
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.
Source:	arXiv, nucl-ex/0006003
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