Sideways-peaked angular distributions in hadron-induced-multifragmentation: Shock waves, geometry, or kinematics?
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Exclusive studies of sideways-peaked angular distributions for intermediate-mass fragments (IMFs) produced in hadron-induced reactions have been performed with the Indiana silicon sphere (ISiS) detector array. The effect becomes prominent for beam momenta above about [Formula Presented] Both the magnitude of the effect and the peak angle increase as a function of fragment multiplicity and charge. When gated on IMF kinetic energy, the angular distributions evolve from forward peaked to nearly isotropic as the fragment energy decreases. Fragment-fragment correlation studies show no evidence for a preferred angle that might signal a fast dynamic breakup mechanism. Moving-source and intranuclear cascade simulations suggest a possible kinematic origin arising from significant transverse momentum imparted to the recoil nucleus during the fast cascade. A two-step cascade and statistical multifragmentation calculation is consistent with the data. 1998 The American Physical Society.
author list (cited authors)
Hsi, W. C., Kwiatkowski, K., Wang, G., Bracken, D. S., Cornell, E., Ginger, D. S., ... Botvina, A.
complete list of authors
Hsi, WC||Kwiatkowski, K||Wang, G||Bracken, DS||Cornell, E||Ginger, DS||Viola, VE||Yoder, NR||Korteling, RG||Gimeno-Nogues, F||Ramakrishnan, E||Rowland, D||Yennello, SJ||Huang, R||Lynch, WG||Tsang, MB||Xi, H||Breuer, H||Morley, KB||Gushue, S||Remsberg, LP||Friedman, WA||Botvina, A