Abstract
The inclusive parallel momentum distributions of fragments from the breakup of a secondary beam have been measured at 66 MeV/nucleon over a wide range of targets Be to ). The measurements were performed using a zero-degree fragment separator as an energy-loss spectrometer operating in a dispersion matched mode. Earlier measurements have been extended here to the case of breakup by where a distribution with a width of FWHM=38.1±1.9 MeV/c was observed. Together with a remeasurement of breakup on (FWHM)=42.8±2.6 MeV/c) a weak dependence of distribution width on target nucleus was observed. A discussion of the nature of the momentum distributions and relationship to the structure of the halo is presented in the light of recent calculations. It is concluded that the fragment parallel momentum distributions are relatively insensitive to the reaction and reflect the extended neutron distribution of the halo.
- Received 20 January 1995
DOI:https://doi.org/10.1103/PhysRevC.51.3116
©1995 American Physical Society