Abstract
A novel fusion-evaporation residue separator based on a gas-filled superconducting solenoid has been developed at the Australian National University. Though the transmission efficiency of the solenoid is very high, precision cross sections measurements require this efficiency to be accurately known and vitally, requires knowledge of the angular distribution of the evaporation residues. We have developed a method to deduce the angular distribution of the evaporation residues from the laboratory-frame velocity distribution of the evaporation residues transmitted by the solenoid. The method will be discussed, focusing on benchmarking examples for 34S+89Y, where the angular distributions have been independently measured using a velocity filter (A. Mukherjee et al., Phys. Rev. C. 66, 034607 (2002)) . The establishment of this method now allows the novel solenoidal separator to be used to obtain reliable, precise fusion cross-sections.
Highlights
Heavy-ion fusion is a complex, many-body quantum process, whereby two separate nuclei merge to form a single, compact compound nucleus
Determining the variables which control this thermalisation is a key step in understanding the progression towards a fully energy-dissipated compound nucleus
One variable thought to be important is the amount of nuclear matter overlap at the barrier radius
Summary
Heavy-ion fusion is a complex, many-body quantum process, whereby two separate nuclei merge to form a single, compact compound nucleus It is intrinsically dissipative, requiring the kinetic energy of the collision to be dispersed into a multitude of internal nucleonic excitations. Existing models of fusion, accounting for the coherent superposition of collective excited states [2], have been quite successful in predicting the outcome of fusion at energies near and below the fusion barrier These models do not explicitly treat the progression of the system from a fully coherent quantum state to the thermalised, compact compound nucleus. By forming the same compound nucleus (our fused product) with four different projectile-target combinations and examining the fusion cross section as a function of ZpZt, we aim to isolate the nuclear matter overlap at the barrier [3]
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