Investigation of the role of break-up processes on the fusion ofO16induced reactions

Abstract

An experiment was carried out to explore heavy ion incomplete fusion reaction dynamics, within the framework of the break-up fusion model, at energies near and above the Coulomb barrier. Excitation functions for several radionuclides produced via xn, pxn, and αxn channels were measured in the 16 O + 181 Ta system at energies of ≈76-100 MeV. The experimental excitation functions were compared with those calculated using the theoretical model code PACE4. It was observed that excitation functions of xn/pxn channels are in good agreement with theoretical predictions. However, a significant enhancement in the measured excitation functions of α-emitting channels was observed and attributed to the incomplete fusion processes. The incomplete fusion fraction (F ICF ) that gives the relative importance of complete and incomplete fusion processes was found to increase with energy. The results are discussed in terms of α-cluster structure of the projectile on various fusion reactions.

Influence of a one-neutron-excess projectile on low-energy incomplete fusion

“…Therefore, it can be safely inferred that the Q α is a rather more suitable parameter than binding energy to explain ICF data. In order to strengthen the above systematics, the values of F ICF for 12 C, 13 C, 16 O+ 159 Tb [44,53,73] and 12 C, 13 C, 16 O+ 181 Ta [46,49] systems have been compared in Figs. 8(a) and 8(b) as a functions of Q α at the same value of of v rel .…”

“…Thus, a comparison of experimental EFs with the statistical model code PACE4 may indicate the extent to which the formation of identified ERs may be explained by the equilibrated CN decay. Any deviation in the experimental EFs with respect to the PACE4 predictions may be attributed to ICF, which is not included in this code [44][45][46][47][48]. channels.…”

“…In order to study low-energy ICF, several inclusive experiments have been performed at the Inter-University Accelerator Center (IUAC), New Delhi [44][45][46][47][48]. This work is an extension of our earlier measurements to study the effect of a one-neutron (1n) excess projectile on the onset and strength of ICF.…”

“…The aforementioned models have been used to fit the experimental data obtained at energies well above the Coulomb barrier (i.e., E lab 10.5 MeV/nucleon) but have shown certain failings in their ability to explain ICF data at relatively low bombarding energies (i.e., ≈ 3-7 MeV/nucleon) [44][45][46][47][48][49][50][51]. More recently, Diaz-Torres et al [52] proposed a three-dimensional classical model for low-energy breakup fusion reactions.…”

Low energy incomplete fusion: Observation of a significant incomplete fusion fraction atℓ< ℓcrit

“…In this hypothesis they asummed a sharp cut-off approximation, according to which the probability of CF is asummed to be unity for = crit and expected to be zero for > crit . However, in recent time several studies have observed the occurrence of ICF processes in the vicinity of Coulomb barrier [5][6][7][8]. Yadav et al [5] has observed the existence of ICF reactions at < crit .…”