Influence of nuclear size on nuclear dynamics, peak mass production's energy and onset of multifragmentation

The effect of nuclear size on different observables in fragmentation reactions is investigated using the quantum molecular dynamics approach. The present study is carried out using Mg-36,Mg-37 projectiles on various target nuclei ranging from Al-27 to Br-80 over a wide range of incident energies. Our findings revealed a significant influence (similar to 20%) of nuclear size on the energy of peak mass production in reactions involving lighter nuclei and this effect of nuclear size decreases for heavier targets. The role of nuclear size on the onset of multifragmentation is also investigated. Various order parameters, such as slopes of charge distribution and moments are seen to get influenced by this initialisation effect. However, the energy of the onset of multifragmentation in Mg-37+Al-27 reaction is observed to be independent of nuclear size.