Single-Proton Removal Reaction Study of 16B

Abstract

The low-lying level structure of the unbound system ${}^{16}$B has been investigated via single-proton removal from a 35 MeV/nucleon ${}^{17}$C beam. The coincident detection of the beam velocity ${}^{15}$B fragment and neutron allowed the relative energy of the in-flight decay of ${}^{16}$B to be reconstructed. The resulting spectrum exhibited a narrow peak some 85 keV above threshold. It is argued that this feature corresponds to a very narrow ($\hat{I}“\ll$100 keV) resonance, or an unresolved multiplet, with a dominant $\ddot{I}€(p_{3/2}{)}^{-1}\otimes \hat{I}½(d_{5/2}^3{)}_{J=3/2^{+}}$ + $\ddot{I}€(p_{3/2}{)}^{-1}\otimes \hat{I}½(d_{5/2}^2,s_{1/2}{)}_{J=3/2^{+}}$ configuration which decays by d-wave neutron emission.

16 pages, 5 figures, 1 table, submitted to Phys. Lett. B