Dynamics of fragment capture for cluster structures of weakly bound⁷Li

Abstract

Abstract.Role of cluster structures of 7 Li on reaction dynamics have been studied by performing exclusive measurements of prompt-γ rays from residues with scattered particles at energy, E/Vb = 1.6, with 198 Pt target. Yields of the residues resulting after capture of t and 4,5,6 He, corresponding to different excitation energies of the composite system were estimated. The results were compared with three body classical-dynamical model for breakup fusion, constrained by the measured fusion, α and t capture cross-sections. The cross-section of residues from capture of α and t agreed well with the prediction of the model showing dominance of the two step processbreakup fusion, while those from tightly bound 6 He showed massive transfer to be the dominant mechanism.

Unraveling the Reaction Mechanisms Leading to Partial Fusion of Weakly Bound Nuclei

“…The ICF is usually interpreted a two-step process [9,[26][27][28][29][30]. For a two-body weakly bound projectile a with a target A, such a process may symbolically be written as…”

“…The latter corresponds to the incomplete fusion (ICF) process mentioned in the introduction. The ICF is usually interpreted a two-step process [9,[26][27][28][29][30]. For a two-body weakly bound projectile a with a target A, such a process may symbolically be written as…”

Incomplete fusion analysis of $^{7}$Li-induced reaction on $^{93}$Nb within 3-6.5 MeV/nucleon

“…A number of theoretical and experimental investigations have been carried out in the recent years to disentangle the breakup mechanism of weakly bound projectiles, predominantly in the 6,7 Li ions consisting of α-particle + triton (t)/deuteron (d) cluster structure with a separation energy of 2.47/1.47 MeV, respectively [1][2][3][4][5][6][7]. Dominance of large α-yields from the non-elastic breakup (NEBU) compared to the elastic breakup (EBU) has been observed in the 6,7 Li projectiles [2].…”

“…Dominance of large α-yields from the non-elastic breakup (NEBU) compared to the elastic breakup (EBU) has been observed in the 6,7 Li projectiles [2]. Breakup of 7 Li projectile may be possible through the following: (i) excitation of relatively long lived resonant state in the projectile continuum followed by its decay into an α-particle + t, termed as sequential breakup, (ii) direct breakup without any intermediate resonant state, and (iii) breakup into 6 He + p and 5 He + d configuration and subsequently fusion of 6 He or 5 He as a massive transfer process [3,4]. Moreover, transfer of nucleon followed by breakup has also been reported where α + α or α + d breakup occurred after the proton (p) pickup by the projectile or neutron (n) transfer from the projectile ( 7 Li).…”