The8Li +2H reaction studied in inverse kinematics at 3.15 MeV/nucleon using the REX-ISOLDE post-accelerator

Abstract

The reaction 8 Li + 2 H has been studied in inverse kinematics at the incident energy of 3.15 MeV/nucleon, using the REX-ISOLDE post-accelerator. The reaction channels corresponding to (d, p), (d, d), and (d, t) reactions populating ground states and low-lying excited states in [7][8][9] Li have been identified and the related angular distributions extracted and compared with coupled-channels, distorted-wave Born approximation (DWBA), and coupled-reaction-channels calculations. For the inelastic and (d, t) channels we find that higher order effects are very important and hence one needs to go beyond the simple DWBA to extract reliable structure information from these processes.

Experimental study of bound states in12Be through low-energy11Be(d,p)Johansen1, Bildstein2, Borge3 et al. 2013Phys. Rev. CSelf Cite283180View full textAdd to dashboardCite

“…is often making use of continuum discretized coupled channel (CDCC) calculations; see [47][48][49] and references therein. The concept of a spectroscopic factor, often used earlier as the key quantity to be extracted from experiment, has also been questioned during the last decade-see Mukhamedzhanov [49] and Jennings [50] for recent overviews-asymptotic normalization coefficients (ANCs) [49,[51][52][53] have been used instead. A proper theoretical analysis of our data is beyond the scope of the present paper so we shall here just briefly indicate what can be learned from a standard approach to allow comparison with earlier experimental work [26].…”

“…This may be due to the loosely bound neutrons in the initial states and the suggested halo structure of some of the final states, factors which are known to affect the reaction mechanism. More refined calculations must be made for the theoretical differential cross sections, e.g., Coupled-Reaction-Channels found to be essential to describe the 8 Li + 2 H reaction at a similar energy [53]. The current disagreement between theoretical and experimental spectroscopic factors may be due to the simplicity of the DWBA calculations, but it is disturbing that the relative strength of transitions to the two 0 + states has opposite trends for theory and experiment.…”

Physics with post-accelerated beams at ISOLDE: nuclear reactions

“…The structure of the unbound 10 Li is still being investigated since it is needed for understanding the composition of the two-neutron halo nucleus 11 Li. The discrepancies found in the modeling of the 9 Li(d,t) experiment triggered a follow-up 8 Li+d experiment [38]. A charge state + 2 beam that had average intensity 1.6×10 6 pps and a considerable stable beam background could be accelerated to 3.15 MeV/u where a stripper foil before the last dipole cut down the stable beam component significantly.…”

Estudo do espalhamento elástico e reações do projétil >sup<8>/sup<Li em alvos de massa leve, intermediária e pesada

“…Como pode ser observado,é evidente a necessidade de diminuir a profundidade real do potencial para descrever os dados. A partir das densidades nucleares,é possível obter os parâmetros de deforma-cão nuclear [64], de acordo com a equação abaixo:…”