Update on energies and widths in Be13

Abstract

I have compared new experimental information on resonances in $^{13}\mathrm{Be}$ with results of theoretical calculations. For the $1/{2}^{+}$ resonance at 0.86 MeV, the reported width of 1.70(15) MeV is considerably larger than the single-particle limit of 1.3 MeV. For the first $5/{2}^{+}$, the calculated width and ${2}^{+}$ branching ratio for neutron decay are both in rough agreement with the data. I discuss the possibility that events from decay of the second $5/{2}^{+}$ to $^{12}\mathrm{Be}({2}^{+})$ could contribute to the 0.86-MeV peak. If the 4.0-MeV resonance is indeed $3/{2}^{+}$, then its width should be considerably larger than reported.