Abstract
The mass of has been determined by measuring the threshold energy of the reaction . Observations were made on both the neutrons from the reaction and the positrons from the decay of . The threshold energy is 2.9661±0.0017 Mev, giving a mass of 8.027157±0.000008 amu for . The half-life of was measured to be 0.78±0.01 sec. Evidence was found for possible excited states in at 0.6±0.1 and 0.80±0.05 Mev with respective widths of 0.2±0.1 and 0.07±0.04 Mev. Assuming that the decay proceeds exclusively to the 2.9-Mev state of , the value is 5.7.
- Received 10 February 1958
DOI:https://doi.org/10.1103/PhysRev.110.1076
©1958 American Physical Society