β-decay branching ratios of the neutron-rich nucleusB15

We have used the Michigan State University National Superconducting Cylcotron Laboratory A1200 radioactive beam facility and a newly designed neutron detector array to measure the first β-delayed neutron spectrosopy of ${}_{}{}^{15}{}_{}{}^{}\mathrm{B}$ and the ${}_{}{}^{15}{}_{}{}^{}\mathrm{B}$ β-decay branch to ${}_{}{}^{15}{}_{}{}^{}\mathrm{C}$ bound states. The ${}_{}{}^{15}{}_{}{}^{}\mathrm{B}$ ions were produced as projectile fragments in the interaction of an E/A=80 MeV ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ beam with a thick beryllium target. From these measurements, we deduce the ${}_{}{}^{15}{}_{}{}^{}\mathrm{B}$ β-decay branching ratios. The results are compared with shell-model predictions carried out in the psd model space.