Breakup-Fusion Description of Massive Transfer Reactions with Emission of Fast Light Particles

Abstract

It is shown that massive transfer reactions emitting energetic light particles can be described in terms of two-step processes, in which breakup of the projectile takes place first, followed by an absorption of the massive partner of the broken-up pair by the target.PACS numbers: 25.70. Be, 24.50.+g

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

“…Moreover, in our recent observation [5], we found a diffused boundary in the -window that may penetrate near the barrier. Different theoretical models [9][10][11][12] have been presented for the ICF, but anyhow those are not able to explain the underlying reaction dynamics at energies below 10 MeV/nucleon. Hence, in order to study the ICF reaction dynamics at low incident energies, we have measured the excitation functions (EFs) of evaporated residues in 16 O + 165 Ho system at energies ≈ 4-7 MeV/nucleon.…”

Observation of incomplete fusion at low angular momenta

“…However, studies [13] on spherical targets showed involvement of -values in ICF lower than critical as well, giving rise to conflicting reports on the a e-mail: dpsingh19@gmail.com dependence of ICF on the angular momentum. Further, it may be pointed out that the available theoretical models [9,[14][15][16][17] satisfactorily predict the magnitude of ICF contribution, to some extent, in some cases at energies ≈10 MeV/nucleon, but none of these models is able to successfully explain such data at low energies. In view of the above, a clear picture of the mechanism of ICF has yet to emerge, particularly at energies ≈3-5 MeV/nucleon.…”

Effect of the Target Deformation on Incomplete Fusion Dynamics

“…Experimentally measured spin distributions of the residues produced as incomplete fusion products associated with fast α and 2α-emission channels observed in forward cone are found to be distinctly different from those of the residues produced as complete fusion products. The mean value of input angular momentum J 0 for evaporation residues produced through xn channels (complete fusion products) is found to be J 0 ≈ 7ħ, while the mean value of input angular momentum J 0 for the residues produced through direct αxn and 2αxn channels (incomplete fusion products) in forward cone, are found to be J 0 ≈ 9ħ and ≈ 12 ħ respectively for 16 O + 124 Sn (spherical) system [7]. The mean value of input angular momentum J 0 for the system 16 O + 169 Tm (deformed) reported in ref.…”

“…Various dynamical models viz. Break-Up Fusion (BUF) [7], Sumrule [8], Promptly Emitted Particles (PEPs) [9], Hot Spot [10], Multistep Direct Reaction theory [10] …”