A two-proton knockout reaction from a 17C beam at 55 MeV/u was used to produce the unbound nucleus 15Be. No significant number of events were observed for the decay of 15Be into a neutron and a 14Be fragment. An upper limit for the 14Be production cross section of 0.079±0.038 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 15Be decay through three sequential neutron decays into 12Be, via the unbound first excited state of 14Be. Therefore, these states in 15Be must be neutron unbound by more than 1.54 MeV, which is the location of the first excited 2+ state in 14Be.
|Original language||English (US)|
|Journal||Physical Review C - Nuclear Physics|
|State||Published - Oct 12 2011|
ASJC Scopus subject areas
- Nuclear and High Energy Physics