Exploring contributions from incomplete fusion inLi6,7+Bi209and

Abstract

We use the breakup absorption model to simultaneously describe the measured cross-sections of the Complete fusion (CF), Incomplete fusion (ICF), and Total fusion (TF) in nuclear reactions induced by weakly bound nuclei 6,7 Li on 209 Bi and 198 Pt targets. The absorption cross-sections are calculated using the Continuum Discretized Coupled Channels (CDCC) method with different choices of short range imaginary potentials to get the ICF, CF and TF cross-sections. It is observed that the cross-sections for deuteron-ICF/deuteron-capture are of similar magnitude as the α-ICF/α-capture, in case of 6 Li projectile, while the cross-sections for triton-ICF/triton-capture is more dominant than α-ICF/α-capture in case of 7 Li projectile. Both these observations are also corroborated by the experimental data. The ratio of ICF to TF cross-sections, which defines the value of fusion suppression factor is found to be in agreement with the data available from the literature. The cross-section ratio of CF/TF and ICF/TF show opposite behavior, the former decreases while the latter increases as the energy is lowered, which shows the dominance of ICF at below barrier energies. We have also studied the correlation of the ICF cross-sections with the non-capture breakup (NCBU) cross-sections as a function of energy, which shows that the NCBU is more significant than ICF at below barrier energies.

Exploring incomplete fusion fraction in 6,7Li induced nuclear reactions

“…The σ ICF /σ TF ratio at above barrier energies gives the value of suppression factor in CF, which is found to be in agreement (∼ 30 %) with the literature data with 7 Li projectiles from various measurements [3]. Similar observation was also indicated in 6,7 Li+ 209 Bi and 6,7 Li+ 198 Pt reactions [20].…”

“…Recently, we have reported the method for simultaneous description of CF, ICF and TF data for the 6,7 Li+ 209 Bi and 6,7 Li+ 198 Pt reactions [20] using Continuum Discretized Coupled Channel (CDCC) calculations involving short range imaginary potential. The details of the calculation method are given in that paper and only short summary is given here.…”

Effects of unconventional breakup modes on incomplete fusion of weakly bound nuclei

“…In Ref. [28] it is assumed that all the observed icf products [24] (i.e., actinium and polonium isotopes) were originated from the 6 Li direct breakup process, which is neither the main observed breakup channel [10][11][12] nor the dominant icf route as demonstrated below. Figure 4 presents the different contributions of various reaction processes to the total icf cross-sections (thick solid line) which are compared with experimental data [24].…”

Classical dynamical modelling of near-barrier breakup

“…Indeed, many works have noted a correlation between the direct breakup threshold and the degree of fusion suppression [19,20]. This correlation is apparent not only for weakly-bound stable nuclides such as 6,7 Li, 9 Be and 6 He, but also for more well-bound nuclides such as 10,11 B, 12,13 C and 16 O. So on the face of it we might conclude that direct breakup causes fusion suppression.…”