Experimental study of resonance states in H7 and H6

The H-7 and H-6 nuclear systems were investigated via transfer reactions with a He-8 beam at 15.4A MeV impinging in a C-12 target. The experimental setup allowed a complete reconstruction of the reaction kinematics with the MAYA gas detector, based on the active-target concept, where the carbon atoms of the filling isobutane played also the role of reaction target. The H-7 resonance was observed at 0.57(-0.21)(+0.42) MeV above the H-3+4n threshold with a width of 0.09(-0.06)(+0.94) MeV. The H-6 system was formed at 2.91(-0.95)(+0.85) MeV with a resonance width of 1.52(-0.35)(+1.77) MeV. These results show the availability of nuclear structure information well outside the bounding limits, resulting in an extraordinary input to improve the present models and understanding of nuclear matter.