Clayton and Jin have proposed that ${}^{26}\mathrm{Al}$ in the early solar system was made by oxygen-rich cosmic rays through the ${}^{12}\mathrm{C}{(}^{16}\mathrm{O}{,x)}^{26}{\mathrm{Al}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ reaction. To test their proposal we have measured the yield of ${}^{26}{\mathrm{Al}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ from this reaction using the activation method. We find that the yield is too low to explain the ${}^{26}\mathrm{Al}{/}^{27}\mathrm{Al}$ ratio that has been observed in carbonaceous chondrite meteorites.

• Received 1 December 1997

DOI:https://doi.org/10.1103/PhysRevC.57.2022