Thumbnail
Access Restriction
Open

Author Libby, B. ♦ Mignerey, A. C. ♦ Colonna, N. ♦ Roussel-Chomaz, P. ♦ Wozniak, G. J. ♦ Moretto, L. G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ LANTHANUM 139 REACTIONS ♦ HOT NUCLEI ♦ NUCLEAR DECAY ♦ ALUMINIUM 27 TARGET ♦ STATISTICAL MODELS ♦ COPPER 65 TARGET ♦ GEV RANGE 01-10 ♦ CROSS SECTIONS ♦ MULTIPLICITY ♦ DALITZ PLOT ♦ NUCLEAR FRAGMENTS
Abstract The reactions {sup 139}La + {sup 27}Al and {sup 139}La + {sup 65}Cu at {ital E}/{ital A} = 45 MeV have been modeled by combining a Boltzmann-Nordheim-Vlasov dynamical model calculation with a statistical sequential binary decay model code. For the reaction {sup 139}La + {sup 27}Al, the major features of the experimental data are adequately described by the model calculations. These features include the inclusive fragment cross sections and the total charge and source velocity distributions of multiple fragment events. Other finer features, such as charge-Dalitz plots and the branching ratios between events of different multiplicity, are not reproduced by the calculation. The failure of the calculations is even greater for the reaction {sup 139}La + {sup 65}Cu, in which only the source velocity distributions of multiple fragment events are reproduced. Because the source velocity can be a measure of how much of the target is incorporated into the projectile in inverse kinematics reactions, this suggests that the earliest stages of the reaction, described by the dynamical calculation, are adequately characterized by the model. It is the later stages of the reaction, when fragments are emitted, where the model calculation appears to fail. However, there are some indications that statistical decay in the reaction {sup 139}La + {sup 65}Cu has occurred, whether by sequential binary decays or some type of prompt multifragmentation. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Physical Review, C
Volume Number 53
Issue Number 6


Open content in new tab

   Open content in new tab