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The nuclear chosmochronometer suggested by Hayakawa et al. [Phys. Rev.C 77,065802 (2008)] based on the 138La-138Ce-136Ce abundance ratio in presolargrains would be affected by the existence of a hitherto unknown low-energy 1+state in 138La. Results of a recent high-resolution study of the 138Ba(3He,t)reaction under kinematics selectively populating 1+ states in 138La throughGamow-Teller transitions provides strong evidence against the existence of sucha hypothetical state.

Comment on "138La-138Ce-136Ce nuclear cosmochronometer of the supernova neutrino process"