Investigation of the $^{6}$He cluster structures
Résumé
The $\alpha$+2$\it{n}$ and $\it{t}$+$\it{t}$ clustering of the $^6$He ground state were investigated by means of the transfer reaction $^6$He($\it{p}$,$\it{t}$)$^4$He 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 DWBA calculation including the two neutrons and the triton transfer. The couplings to the $^6$He $\rightarrow$ $^4$He + 2$\it{n}$ breakup channels were taken into account with a polarization potential deduced from a coupled-discretized-continuum channels analysis of the $^6$He+$^1$H elastic scattering measured at the same time. The influence on the calculations of the $\alpha$+$\it{t}$ exit potential and of the triton sequential transfer is discussed. The final calculation gives a spectroscopic factor close to one for the $\alpha$+2$\it{n}$ configuration as expected. The spectroscopic factor obtained for the $\it{t}$+$\it{t}$ configuration is much smaller than the theoretical predictions
