Selective Parity Transitions and Dinuclear Orbiting ofC12+Mg

Characterization of fragment emission inNe20(7–10 MeV/nucleon)+C12Dey1, Bhattacharya2, Bhattacharya3 et al. 2007Phys. Rev. C19020View full textAdd to dashboardCite

“…like angular dependence -characteristic of a long-lived, orbiting, dinuclear complex. Similar results have been obtained for 20 Ne + 12 C system [12,13], where resonance-like behaviour was also found in the excitation functions for several outgoing channels, which was similar to the observation made for symmetric 16 O + 16 O system [25,26,27,28]. Enhancements of large angle, binary reaction yields have also been observed in somewhat heavier 28 Si + 28 Si, 24 Mg + 24 Mg systems [1], where significant non resonant background yield was observed at higher excitation energies.…”

“…[13] and assuming the excitation energy division follows the mass ratio [1]) are in qualitative agreement with the experimental results obtained at 9 MeV/nucleon by Rae et al [41] for the sequential decay of 20 Ne + 12 C. It was found that even at the highest excitation energy, secondary decay of Si * and Al * do not reach up to N; the contribution of primary Mg * , Na * decay to Z ≤ 7 were estimated to be < ∼ 1% of the primary yield and that of Ne * decay to N, C, B yield were estimated to be ∼ 10-20%, ∼ 15-20% and ∼ 30-50% of the primary yield, respectively. Nearly ∼ 40-45% of the primary O * produced through binary exit channel 16 O + 16 O decays to C. The secondary decay yields from the primary excited fragments are shown in Fig. 9 for different bombarding energies.…”

“…Several experiments have been done in recent years to understand the mechanism of complex fragment emission in low-energy (E lab < ∼ 10 MeV/nucleon) light heavy-ion (A projectile + A target < ∼ 60) reactions [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. The origin of these fragments extends from quasi-elastic (QE)/ projectile breakup [2,3], deep-inelastic (DI) transfer and orbiting [4,6,12,13,14,15,16], to fusion-fission (FF) [18,19,20,21,22,23] processes; and in some cases the structure of the nuclei has been found to play an important role.…”

“…The origin of these fragments extends from quasi-elastic (QE)/ projectile breakup [2,3], deep-inelastic (DI) transfer and orbiting [4,6,12,13,14,15,16], to fusion-fission (FF) [18,19,20,21,22,23] processes; and in some cases the structure of the nuclei has been found to play an important role. In most of the reactions studied, the observed fully energy-damped yields of the fragments have been successfully explained in terms of fusion-fission (FF) mechanism [18,19,20,21,22,23].…”

“…In most of the reactions studied, the observed fully energy-damped yields of the fragments have been successfully explained in terms of fusion-fission (FF) mechanism [18,19,20,21,22,23]. However, the reactions involving α -cluster nuclei (e.g., 20 Ne + 12 C [12,13], 24 Mg + 12 C [16], 28 Si + 12 C [14,24] etc.) deserved special attention, where the observations of large enhancement in yield and/or resonance-like excitation function in a few outgoing channels have been indicative of a competitive role played by the deep-inelastic orbiting mechanism [12,13,14,15].…”