Investigation of 6He cluster structures

Giot, L.; Roussel-Chomaz, P.; Demonchy, C.E.; Mittig, W.; Savajols, H.; Alamanos, N.; Auger, F.; Gillibert, A.; Jouanne, C.; Lapoux, V.; Nalpas, L.; Pollacco, E.C.; Sida, J.L.; Skazza, F.; Cortina-Gil, M.D.; Femandez-Vasquez, J.; Mackintosh, R.S.; Pakou, A.; Pita, S.; Rodin, A.; Stepantsov, S.; Ter Akopian, G.M.; Rusek, K.; Thompson, I.J. and Wolski, R. (2005). Investigation of 6He cluster structures. Physical Review C, 71 064311.



The +2n and t+t clustering of the 6He ground state were investigated by means of the transfer reaction 6He(p,t)4He at 25 MeV/nucleon. The experiment was performed in inverse kinematics at GANIL with the SPEG spectrometer coupled to the MUST array. Experimental data for the transfer reaction were analyzed by a distorted wave Born approximation (DWBA) calculation, including the two neutrons and the triton transfer. The couplings to the 6He4He+2n breakup channels were taken into account with a polarization potential deduced from a coupled-discretized-continuum channels analysis of the 6He+1H elastic scattering measured at the same time. The influence on the calculations of the +t exit potential and of the triton sequential transfer is discussed. The final calculation gives a spectroscopic factor close to one for the +2n configuration as expected. The spectroscopic factor obtained for the t+t configuration is much smaller than the theoretical predictions.

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