Abstract:
The spin-distributions of different reaction products populated via xn and
α/2αxn channels in 12C + 169Tm system have been measured at Elab ≈ 6, 7 and
7.5 MeV A−1 to disentangle complete and incomplete fusion events. Particle
(p, α)-γ-coincidences were recorded to identify evaporation residues channelby-channel. The spin-distributions of fusion evaporation and direct-α-emitting
channels are found to be distinct corroborating the involvement of entirely different reaction dynamics in their production, respectively termed as complete
(CF) and incomplete fusion (ICF). The values of mean input angular momenta,
obtained from the analysis of the spin-distributions, involved in ICF-α/2αxn
channels are estimated to be larger than that observed in CF-xn/αxn channels.
For ICF-α/2αxn channels, the multiplicity of fast-α particle emission increases
with the magnitude of input angular momentum imparted into the system. The
CF residues display a population of broad spin range while the ICF residues
are confined to a narrow spin range generally localized in the higher spin states.
Findings of the present work conclusively demonstrate the possibility to populate high spin states in final reaction products using ICF, which are otherwise not accessible. Further, an attempt has been made to study the variation of
input angular momentum with the choice of different entrance-channel parameters. It has been observed that the value of input angular momentum involved
in ICF-α/2αxn channels increases with the deformation and entrance-channel
mass-asymmetry parameter, indicating strong entrance-channel dependence of
ICF dynamics.
