Small Momentum Widths in Heavy-Ion Fragmentation at 20 MeV/amu and Below

Ch. Egelhaaf; G. Bohlen; H. Fuchs; A. Gamp; H. Homeyer; H. Kluge

doi:10.1103/PhysRevLett.46.813

Small Momentum Widths in Heavy-Ion Fragmentation at 20 MeV/amu and Below

Ch. Egelhaaf, G. Bohlen, H. Fuchs, A. Gamp, H. Homeyer, and H. Kluge

Phys. Rev. Lett. 46, 813 – Published 30 March 1981

Abstract

The widths of the momentum distributions for quasielastic fragments produced by ${}^{20}{Ne}$ on ${}^{197}{Au}$ at 20 MeV/amu and below are found, in contrast to a previous similar measurement, to be much smaller than at 2 GeV/amu. This contradicts a rapid change of reaction mechanism near 20 MeV/amu, in particular, the sudden onset of fragmentation or the decay from a nonequilibrated high-temperature subsystem.