Intermediate mass fragment emission in 36Ar+197Au collisions at E/A=35 MeV.

Abstract

Intermediate mass fragment (IMF: 3\ensuremath{\le}Z\ensuremath{\le}20) emission for the $^{36}\mathrm{Ar}$${+}^{197}$Au reaction at E/A=35 MeV has been studied with a low-threshold 4\ensuremath{\pi} charged-particle detector array covering the angular range of 16\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}${\mathrm{\ensuremath{\theta}}}_{\mathrm{lab}}$\ensuremath{\le}160\ifmmode^\circ\else\textdegree\fi{}. While most IMF's are emitted in central collisions characterized by large charged-particle multiplicities, contributions from peripheral collisions exist at forward angles which are reminiscent of damped collisions or emission from a projectile-like source. Energy spectra, angular distributions, element distributions, and two-fragment correlation functions are presented for various gates on the charged-particle multiplicity, and the time scale of fragment emission is deduced.