Eur. Phys. J. A 10, 249-253

Strong reaction channels at barrier energies in the system ⁶Li + ²⁰⁸Pb

C. Signorini¹, M. Mazzocco¹, G.F. Prete², F. Soramel³, L. Stroe¹, A. Andrighetto¹, I.J. Thompson⁴, A. Vitturi¹, A. Brondi⁵, M. Cinausero², D. Fabris¹, E. Fioretto², N. Gelli⁶, J.Y. Guo^{1, 7}, G. La Rana⁵, Z.H. Liu⁷, F. Lucarelli⁶, R. Moro⁵, G. Nebbia¹, M. Trotta², E. Vardaci⁵ and G. Viesti<sup>1

1</sup>  Physics Department and INFN, via Marzolo 8, I-35131 Padova, Italy
²  INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
³  Physics Department and INFN, I-33100 Udine, Italy
⁴  Physics Department, University of Surrey, Guilford GU2 5XH, U.K.
⁵  Physics Department and INFN, I-80125 Napoli, Italy
⁶  Physics Department and INFN, Firenze, Italy
⁷  China Institute of Atomic Energy, Beijing, P.R. of China

(Received: 15 January 2001 / Revised version: 16 February 2001 Communicated by J. Äystö)

Abstract
Large cross-section reaction channels were measured in the systems ⁶Li(⁷Li) + ²⁰⁸Pb with high statistical accuracy at 5(3) energies around the Coulomb barrier from 29 to 39 MeV. These channels were assigned (mainly) to the breakup of ⁶Li, very loosely bound, into + d and to the breakup of ⁵Li, produced by n-transfer to the target, into + p and to similar processes with ⁷Li beam. The cross-sections with ⁶Li, = 1.475 MeV, are systematically larger than the ⁷Li ones. This reflects, most likely, the higher binding energy of ⁷Li, = 2.468 MeV. Theoretical predictions for the ⁶Li + ²⁰⁸Pb system which include for ⁶Li breakup to continuum states within a continuum discretized coupled-channels approach (CDCC) and resonant breakup plus n-transfer with DWBA reproduce the angular distribution shapes but still underestimate the cross-sections by a factor ~ 3.

PACS
25.70.Ji - Fusion and fusion-fission reactions.
25.70.Mn - Projectile and target fragmentation.
24.10.Eq - Coupled-channel and distorted wave models.

© Società Italiana di Fisica, Springer-Verlag 2001