Structure of states in [superscript 12]Be via the [superscript 11]Be(d, p) reaction

Abstract

The s-wave neutron fraction of the 0[superscript +] levels in [superscript 12]Be has been investigated for the first time through the [superscript 11]Be(d, p) transfer reaction using a 5 A MeV [superscript 11]Be beam at TRIUMF, Canada. The reaction populated all the known bound states of [superscript 12]Be. The ground state s-wave spectroscopic factor was determined to be 0.28[superscript +0.03][subscript −0.07] while that for the long-lived 0[superscript +][subscript 2] excited state was 0.73[superscript +0.27][subscript −0.40]. This observation, together with the smaller effective separation energy indicates enhanced probability for an extended density tail beyond the [superscript 10]Be core for the 0[superscript +][subscript 2] excited state compared to the ground state.