Abstract
A two-proton knockout reaction from a C beam at 55 MeV/u was used to produce the unbound nucleus Be. No significant number of events were observed for the decay of Be into a neutron and a Be fragment. An upper limit for the Be production cross section of 0.0790.038 mb was extracted, which is more than an order of magnitude smaller than the predicted two-proton knockout reaction cross section. Based on these results we conclude that any populated states in Be decay through three sequential neutron decays into Be, via the unbound first excited state of Be. Therefore, these states in Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2 state in Be.
- Received 1 July 2011
DOI:https://doi.org/10.1103/PhysRevC.84.044309
©2011 American Physical Society