Fragment emission studies of the16O+12Creaction

Abstract

The inclusive energy distributions of the fragments (3 Z 5) emitted in the reaction 16 O + 12 C have been measured in the angular range 9 • to 29 • , at the energies 117, 125, 145, and 160 MeV, respectively. The centroids of the fragments energy distributions follow Viola systematics, which suggest that the fragments are emitted from a fully energy relaxed composite-as expected for both FF and orbiting processes. The center of mass angular distributions of the fragments B, Be, and Li obtained at all the bombarding energies follow 1/ sin θ c.m. like variation-which further corroborates the conjecture of emission from fully equilibrated composite. The average Q values for the fragments B, Be, and Li are found to be independent of the center of mass emission angles, which further suggest that at all angles, the fragments are emitted from completely equilibrated source at all incident energies considered here. The yields of the fragments Li and Be are in agreement with statistical-model predictions. The enhanced yields of entrance channel fragment B indicate the survival of orbiting-like process in 16 O + 12 C system at these energies.

Clustering effects and decay analysis of the light-mass N=Z and N≠Z composite systems formed in heavy ion collisions

“…8(a)), the 10 B cluster is having the least P while it is preformed strongly and 11,12 C and 13,14,15 N have the higher value of P. In case of 28 Si * (Fig. 8(b)), at low angular momentum, the 7 Li has the least P and other clusters 5,6 Li, 8 Be, 9,10 B have higher P. In case of 40 Ca * (Fig.…”

“…Two of us (SKP and RKG) have studied [9] the clustering in light, stable and exotic nuclei within the relativistic mean field approach which explains the well established cluster structures in both the ground and intrinsic excited states of these nuclei. In this study, α-clustering and halo structures have also been explored for the 6−14 Be and 11,13,15,17,19 B isotopes, respectively, having α+α+xn structures with α+α as the core and α+α+p+xn structures with α+α+p as the core. On the same lines, Ebran et al have studied [10] the clustering in light N=Z, 20 Ne nucleus within the density functional theory and explored that the cause of cluster formation lies in the effective nuclear interaction.…”

Deformation in28Si*produced via the16O+Kundu1, Bhattacharya2, Bhattacharya3 et al. 2013Phys. Rev. CSelf Cite

“…For these systems, orbiting ( 40 Ca * [6,7], 32 S * [1-3]) had already been conjectured from the fragment emission studies. Recently, we have reported that, for α-cluster system 16 O + 12 C [12], there was enhancement in the boron product yield at excitation energies ∼67-85 MeV (beam energy in the range of 7-10 MeV/nucleon), which indicated the survival of long-lived dinuclear orbiting composites at such high excitation energies. An orbiting dinuclear complex is assumed to be more deformed than a fully shape equilibrated CN; this motivated us to look for such enhanced deformation in a 16 O + 12 C dinuclear system at same excitation energies using the LCP spectroscopy technique.…”

Fragment emission studies in low energy light heavy-ion reactions

“…The origin of these fragments extends from quasielastic, deep-inelastic transfer and orbiting to fusion -fission (FF) processes. The occurrence of FF and orbiting like processes have been observed experimentally in some light as well as medium heavy ion collision at beam energy well above the barrier [1][2][3][4][5][6][7]. The FF process appears to be less competitive in systems for which the number of open channels or available phase space in exit channel is less, however, a di-nuclear configuration survives for a longer period through an orbiting trajectory [2].…”

“…The FF process appears to be less competitive in systems for which the number of open channels or available phase space in exit channel is less, however, a di-nuclear configuration survives for a longer period through an orbiting trajectory [2]. For reactions involving α-clustered nuclei, e.g, 20 Ne + 12 C, 24 Mg + 12 C, 28 Si + 12 C, etc., enhancement in the yield and/or resonance-like excitation function in a few outgoing channels (around the entrance channel) have indicated the role played by deep inelastic orbiting process in fragments emission [3][4][5][6]. In the FF mechanism, a completely equilibrated compound nucleus (CN) is formed, which decays into various exit channels.…”