Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-02-23
Phys.Rev.C76:044605,2007
Physics
Nuclear Physics
Nuclear Experiment
16 pages, 18 figures, submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.76.044605
The reaction mechanism of projectile fragmentation at intermediate energies has been investigated observing the target dependence of the production cross sections of very neutron-rich nuclei. Measurement of longitudinal momentum distributions of projectile-like fragments within a wide range of fragment mass and its charge was performed using a hundred-MeV/n $^{40}$Ar beam incident on Be and Ta targets. By measurement of fragment momentum distribution, a parabolic mass dependence of momentum peak shift was observed in the results of both targets, and a phenomenon of light-fragment acceleration was found only in the Be-target data. The analysis of production cross sections revealed an obvious enhancement of the target dependence except target size effect when the neutron excess is increased. This result implies the breakdown of factorization (BOF) of production cross sections for very neutron-rich nuclei near the drip line.
Aoi N.
Fukuda Naoya
Inabe Naohito
Ishihara Masafumi
Ito Setsuko
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