Breakup Reactions of Neutron Halo Nuclei
We present experimental studies of breakup reactions of one-neutron halo nucleus 11 Be and two-neutron halo nucleus 11 Li with carbon and lead targets at approximately 70 MeV/nucleon at RIKEN. In the Coulomb breakup of 1¹Be, the selection of forward scattering angles has been found useful to extract the first-order E1 Coulomb breakup component, and to exclude the nuclear contribution and higher-order Coulomb breakup components. This angle-selected energy spectrum is thus used to deduce the spectroscopic factor for the halo configuration in 11Be, which has been found to be 0.72 ± 0.04. In the breakup of 11 Be with the carbon target, we have observed excitations to the discrete states at Ex = 1.78 MeV and Ex = 3.41 MeV. Angular distributions for these states show the diffraction pattern characteristic of L = 2 transitions. In the Coulomb breakup of 11 Li we have observed the strong E1 excitation at Erel ~ 300 keV, which is very different from the previous observations. The non-energy weighted sum of E1 strength indicates the strong neutron-neutron correlations in 11 Li.
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| Format: | Digital revista |
| Language: | English |
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Sociedad Mexicana de Física
2006
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0035-001X2006000700008 |
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