Structures and decay of deep-hole states in light nuclei populated by the (p, 2p 2p) reactions

Decay particles from the s-hole states in B-11 and N-15 have been measured in coincidence with the quasifree C-12(p, 2p) and O-16(p, 2p) reactions at E-p = 392 MeV. Triton decay is found to be dominant for the B-11(s-hole) state and also found to be larger than alpha decay for the N-15(s-hole) state despite its smaller Q value compared to alpha decay. Measured decay branching ratios are discussed in comparison with the results of statistical-model, SU(3)-model, and shell-model calculations. The energy spectra around the s-hole states in both B-11 and N-15 exhibit some bumplike structures, which can be qualitatively explained by recent shell-model calculations for both nuclei. (C) 2004 MAIK "Nauka/Interperiodica".