Sequential Decay Distortion of Goldhaber Model Widths for Spectator Fragments
Y. G. Ma, R. Wada, K. Hagel, M. Murray, A. Ono, J. S. Wang, L. J. Qin, A. Makeev, P. Smith, J. B. Natowitz
Abstract
Momentum widths of the primary fragments and observed final fragments have been investigated within the framework of an Antisymmetrized Molecular Dynamics transport model code (AMD-V) with a sequential decay afterburner (GEMINI). It is found that the secondary evaporation effects cause the values of a reduced momentum width, σ0, derived from momentum widths of the final fragments to be significantly less than those appropriate to the primary fragment but close to those observed in many experiments. Therefore, a new interpretation for experiemental momentum widths of projectile-like fragments is presented.
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