Production of particle unstable light nuclei in 11.5A GeV/c Au+Pt heavy-ion collisions

We report measurements from experiment E864 at the BNL-AGS of the yields of particle unstable light nuclei in central collisions of Au-197 with beam momentum of 11.5A GeV/c on Pt-197. Yields are reported as a function of rapidity for the nuclei H-4, Li-4, He-5, and Li-5 in the rapidity range from y(c.m.) to y(c.m.)+0.8 and in the transverse momentum range of approximately 0.1 less than or equal to p(T)/A less than or equal to 0.4 GeV/c. The yields are compared to previously reported yields and trends for the production of stable light nuclei. The nonobservation of two excited states He-5(16.75 MeV)* and Li-5(16.66 MeV)* is used to set an upper limit on the yields of these states.