Calculations of three-body observables in8Bbreakup

Abstract

We discuss calculations of three-body observables for the breakup of 8 B on a 58 Ni target at low energy using the coupled discretised continuum channels approach. Calculations of both the angular distribution of the 7 Be fragments and their energy distributions are compared with those measured at several laboratory angles. In these observables there is interference between the breakup amplitudes from different spin-parity excitations of the projectile. The resulting angle and the energy distributions reveal the importance of the higher-order continuum state couplings for an understanding of the measurements.

Coupled channels calculations of 11Be breakup

“…Details can be found in, for example, Ref. [6]. Our CDCC calculations were performed using the coupled channels code fresco [7].…”

Above-barrier fusion enhancement of proton-halo systems

“…In summary, under the reasonable hypothesis that Tostevin's CDCC calculations [4,12] provide realistic bu estimations, it has been shown that the presence of breakup protons in the experimental data reported in Ref. [1] does not change the previous conclusion that a considerable fusion enhancement above the Coulomb barrier is present for the proton-halo system 8 B + 58 Ni.…”

“…Detailed CDCC calculations by Tostevin et al [4] reproduced the breakup data for both the angular distributions of the 7 Be fragments and their energy distributions measured at several laboratory angles. It is thus realistic to expect that the corresponding predictions for breakup protons can be reliably used to estimate their contribution to the inclusive proton spectra.…”

“…The low value of the respective threshold energy (0.138 MeV) tends to favour the occurrence of the bu process. Previous CDCC calculations [4] indicated that bu protons peak at forward angles, and extrapolation of the published angular distribution to backward angles seemed to indicate negligible cross section at angles above ∼ 115 • . With this available information, the proton detectors in Ref.…”

“…Calculations for three different combinations of these potentials, all of them quite reasonable, were done in Refs. [4,12]. In the angular region of interest (110 • -160 • ), the sensitivity of the results to changes in these potentials indicates a maximum variation of ∼38% for dσ p /dΩ (see Fig.…”