Abstract
Unexpected and challenging experimental results, at below barrier energies for weakly bound nuclei, are briefly reviewed in this article. The emphasis will be on our recent breakup results for 8B+208Pb at deep sub-barrier energies, indicating a dominance of direct mechanisms at this low energy regime. We will also present, a preliminary analysis of the 4He and 3He - particle production events for the 7Be + 208Pb reaction. These data were collected at the same experiment and at similar deep sub-barrier energies, exhibiting large yields compatible with cluster transfer processes. To confirm these results a new experiment to be performed at TriSol is planned, as soon as the upgrading of this facility will be completed.
Highlights
The investigation of reaction dynamics at near barrier energies for weakly bound nuclei was pursued systematically the last 20 years
The last issue indicates the persistence of reaction channels at deep sub-barrier energies. These facts intrigued our interest at this low energy regime and initiated our new experiment [14] at the Notre Dame University, TwinSol facility [15]
We present a two dimension ΔE versus E plot, zoomed in the helium area. These data are due to one strip of the Double Sided Silicon Strip Detector (DSSSD) detector, corresponding to θlab ≈ 41◦
Summary
The investigation of reaction dynamics at near barrier energies for weakly bound nuclei was pursued systematically the last 20 years It proved to be a fruitful play ground in relation with channel coupling effects affecting, either elastic scattering and probing a new type of the standard potential threshold anomaly -see e.g Refs. Inclusive measurements are reported for the proton rich radioactive nucleus 7Be on a 28Si [17] and a 58Ni target [19] These measurements have been performed at near barrier energies with the conclusion that standard Continuum Discretized Coupled-Channel calculations (CDCC) and Distorted Wave Born Approximation ( DWBA) calculations for breakup and transfer can not accommodate the very large measured α - production cross sections, in excess of the 3He ones.
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