The He-6 + He-4 elastic scattering cross section was measured at E-c.m.=11.6 MeV using a He-6 radioactive beam and a He-4-implanted Al foil as target. The use of the thin implanted target allowed to enlarge the angular range in which the data were collected, with respect to a previous measurement at the same center-of-mass energy. The new and previous data are compared with several calculations. The inclusion of a description for the 2n-transfer process, either with a parity-dependent term, or with a distorted-wave Born approximation transfer amplitude, is crucial to reproduce the increase of the cross section at large angles, thus assessing the contribution of the 2n-transfer process to the reaction. At the present energy, the complicated nature of the transfer process and the possible role played by the coupling to other channels, in particular, the breakup, require sophisticated reaction models in order to extract the relevant information on the peculiar He-6 nucleus. The quality of the data is such that the differences between He-6 and the similar Li-6 system should be identified by such calculations.

The He-6 + He-4 elastic scattering cross section was measured at E-c.m.=11.6 MeV using a He-6 radioactive beam and a He-4-implanted Al foil as target. The use of the thin implanted target allowed to enlarge the angular range in which the data were collected, with respect to a previous measurement at the same center-of-mass energy. The new and previous data are compared with several calculations. The inclusion of a description for the 2n-transfer process, either with a parity-dependent term, or with a distorted-wave Born approximation transfer amplitude, is crucial to reproduce the increase of the cross section at large angles, thus assessing the contribution of the 2n-transfer process to the reaction. At the present energy, the complicated nature of the transfer process and the possible role played by the coupling to other channels, in particular, the breakup, require sophisticated reaction models in order to extract the relevant information on the peculiar He-6 nucleus. The quality of the data is such that the differences between He-6 and the similar Li-6 system should be identified by such calculations.

2n-transfer contribution in the He-4(He-6,He-6)He-4 cross section at E-c.m.=11.6 MeV

CHERUBINI, SILVIO;MUSUMARRA, Agatino;
2003

Abstract

The He-6 + He-4 elastic scattering cross section was measured at E-c.m.=11.6 MeV using a He-6 radioactive beam and a He-4-implanted Al foil as target. The use of the thin implanted target allowed to enlarge the angular range in which the data were collected, with respect to a previous measurement at the same center-of-mass energy. The new and previous data are compared with several calculations. The inclusion of a description for the 2n-transfer process, either with a parity-dependent term, or with a distorted-wave Born approximation transfer amplitude, is crucial to reproduce the increase of the cross section at large angles, thus assessing the contribution of the 2n-transfer process to the reaction. At the present energy, the complicated nature of the transfer process and the possible role played by the coupling to other channels, in particular, the breakup, require sophisticated reaction models in order to extract the relevant information on the peculiar He-6 nucleus. The quality of the data is such that the differences between He-6 and the similar Li-6 system should be identified by such calculations.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/36917
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