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Measurements of the lithium isotopic ratio in the diffuse interstellar mediumfrom high-resolution spectra of the LiI {\lambda}6708 resonance doublet havenow been reported for a number of lines of sight. The majority of the resultsfor the 7Li/6Li ratio are similar to the Solar System ratio of 12.2 but theline of sight toward o Per, a star near the star-forming region IC 348, gave aratio of about 2, the expected value for gas exposed to spallation and fusionreactions driven by cosmic rays. To examine the association of IC 348 withcosmic rays more closely, we measured the lithium isotopic ratio for lines ofsight to three stars within a few parsecs of o Per. One star, HD 281159, has7Li/6Li ~ 2 confirming production by cosmic rays. The lithium isotopic ratiotoward o Per and HD 281159 together with published analyses of the chemistry ofinterstellar diatomic molecules suggest that the superbubble surrounding IC 348is the source of the cosmic rays.

Parsec-scale Variations in the 7Li/6Li Isotope Ratio Toward IC 348 and the Per OB 2 Association