1n- and 2n-transfer with the Borromean nucleus $^{6}$He near the Coulomb barrier

Avhishek Chatterjee (1, 2) , A. Navin (1) , A. Shrivastava (2) , S. Bhattacharyya (1) , M. Rejmund (1) , N. Keeley (3, 4) , V. Nanal (5) , J. Nyberg (6) , R.G. Pillay (5) , K. Ramachandran (2) , I. Stefan (1) , Dominique Bazin (7) , D. Beaumel (8) , Y. Blumenfeld (8) , G. de France (1) , D. Gupta (8) , M. Labiche (9) , A. Lemasson (1) , R. Lemmon (9) , R. Raabe (1) , J.A. Scarpaci (8) , C. Simenel (3) , C. Timis (10)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 Nuclear Physics Division
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 Department of Nuclear Reactions
5 DNAP
6 JYU - Department of Physics [Jyväskylä Univ]
7 National Superconducting Cyclotron Laboratory
8 IPNO - Institut de Physique Nucléaire d'Orsay
9 CCLRC
10 Department of Physics

Angular distributions for 1n- and 2n-transfer are reported for the 6He + 65Cu system at Elab = 22.6 MeV. For the first time, triple coincidences between particles, neutrons and characteristic rays from the target-like residues were used to separate the contributions arising from 1n- and 2n-transfer. The differential cross sections for these channels, elastic scattering, and fusion were analyzed using a Coupled Reaction Channels approach. The large measured ratio of the 2n/1n cross section and the strong influence of 2n-transfer on other channels indicate that the di-neutron configuration of 6He plays a dominant role in the reaction mechanism.

Mots clés: Détecteur EXOGAM; Unstable nucleus induced transfer reactions; Direct nuclear reactions; Heavy ion-induced fusion and fusion-fission reactions; Properties of nuclei with 6≤A≤19

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Avhishek Chatterjee, A. Navin, A. Shrivastava, S. Bhattacharyya, M. Rejmund, et al.. 1n- and 2n-transfer with the Borromean nucleus $^{6}$He near the Coulomb barrier. Physical Review Letters, 2008, 101, pp.032701. ⟨10.1103/PhysRevLett.101.032701⟩. ⟨in2p3-00291201⟩