Exotic molecular and halo states in $^{12,14}$Be
- Freer, M.
- Orr, N.A.
- Labiche, M.
- Marqués, F.M.
- Angélique, J.C.
- Axelsson, L.
- Benoit, B.
- Bergmann, U.
- Borge, M J G.
- Catford, W N.
- Chappell, S P G.
- Clarke, N M.
- Costa, G.
- Curtis, N.
- D'Arrigo, A.
- D'Oliviera, F.
- De Goes-Brennard, E.
- Dorvaux, O.
- Fulton, B R.
- Gardina, G.
- Gregori, C.
- Grevy, S.
- Guillemaud-Mueller, D.
- Hanappe, F.
- Heusch, B.
- Jonson, B.
- Kelly, G.
- Le Brun, C.
- Leenhardt, S.
- Lewitowicz, M.
- Markenroth, K.
- Motta, M.
- Mueller, A C.
- Murgatroyd, J T.
- Nilsson, T.
- Ninane, A.
- Nyman, G.
- Piqueras, I.
- Riisager, K.
- Saint-Laurent, M.G.
- Sarazin, F.
- Singer, S.
- Sorlin, O.
- Stuttge, L.
- Watson, D L.
DOIAbstract
International audienceThe two nuclei 12Be and 14Be have been studied using breakup reactions on p, 12C and 208Pb targets. The decay of 12Be into two helium clusters (6He+6He and 4He+8He) was observed from a series of excited states between 10 and 25 MeV, with spins in the range 4+ to 8+. The single neutron angular distributions for 14Be exhibit the narrow forward peak characteristic of a halo. The widths of these distributions in coincidence with 12Be fragments are ΓL = 78±6 and 80±1 MeV/c for breakup on carbon and lead
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