Beta-decay half-lives and delayed neutron emission probabilities of very neutron-rich nuclides from Li to Al have been measured by a delayed coincidence technique. Neutron-rich nuclides were produced by reaction of 800-MeV protons on a ${}_{}{}^{232}{}_{}{}^{}\mathrm{Th}$ target and were individually identified by use of the time-of-flight isochronous spectrometer. For 16 previously measured nucides, the half-lives determined here agree with literature values within the uncertainties. The previously unmeasured half-lives for ${}_{}{}^{25}{}_{}{}^{}\mathrm{F}$ (59±40 ms) and ${}_{}{}^{28}{}_{}{}^{}\mathrm{Ne}$ (14±10 ms) have been determined. Delayed neutron emission has been measured for ${}_{}{}^{12}{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{17}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{25}{}_{}{}^{}\mathrm{F}$, and ${}_{}{}^{28}{}_{}{}^{}\mathrm{Ne}$. Emission probabilities are reported for 19 precursors and upper limits are reported for 12 other nuclides. These data are compared with predictions of several beta-decay models.

• Received 29 March 1991

DOI:https://doi.org/10.1103/PhysRevC.44.1435