Experimental study of resonance states in H7 and H6

Abstract

The H7 and H6 nuclear systems were investigated via transfer reactions with a He8 beam at 15.4A MeV impinging in a C12 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 H7 resonance was observed at 0.57-0.21+0.42 MeV above the 3H+4n threshold with a width of 0.09-0.06+0.94 MeV. The H6 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. © 2008 The American Physical Society.