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Phys. Rev. C 67, 044602 (2003) [6 pages]

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

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R. Raabe *, A. Andreyev †, M. Huyse, A. Piechaczek ‡, P. Van Duppen, L. Weissman §, and A. Wöhr **
Instituut voor Kern- en Stralingsfysica, University of Leuven, B-3001 Leuven, Belgium

C. Angulo, S. Cherubini ††, and A. Musumarra ‡‡
Centre de Recherches du Cyclotron and Institut de Physique Nucléaire, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium

D. Baye and P. Descouvemont
Physique Nucléaire Théorique et Physique Mathématique, Case Postale 229, Université Libre de Bruxelles, B-1050 Brussels, Belgium

T. Davinson, A. Di Pietro ‡‡, A. M. Laird, A. Ostrowski , and A. Shotter a
Department of Physics & Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom

L. I. Galanina and N. S. Zelenskaya
Nuclear Physics Institute, Lomonosov Moscow State University, 119899 Moscow, Russia

Received 26 November 2002; published 2 April 2003

The 6He + 4He elastic scattering cross section was measured at Ec.m.=11.6 MeV using a 6He radioactive beam and a 4He-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 6He nucleus. The quality of the data is such that the differences between 6He and the similar 6Li system should be identified by such calculations.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.67.044602
DOI: 10.1103/PhysRevC.67.044602
PACS: 25.10.+s, 25.60.Bx, 25.60.Je

* Present address: DSM/DAPNIA/SPhN, CEA Saclay, France. Electronic address: raabe@cea.fr
† Present address: University of Liverpool, United Kingdom.
‡ Present address: Oak Ridge National Laboratory, Oak Ridge, TN 37831.
§ Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824.
** Present address: Argonne National Laboratory, Argonne, IL 60439.
†† Present address: Ruhr Universität Bochum, Germany.
‡‡ Present address: Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania, Italy.
Present address: Johannes Gutenberg University, Mainz, Germany.
a Present address: TRIUMF, Vancouver, Canada.

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