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

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

2009-02-11

arxiv.org/abs/0902.1844v1

Phys.Rev.C79:059801,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Comment on Phys. Rev. C 77, 065802 (2008), submittted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.79.059801

The nuclear chosmochronometer suggested by Hayakawa et al. [Phys. Rev.C 77, 065802 (2008)] based on the 138La-138Ce-136Ce abundance ratio in presolar grains 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 through Gamow-Teller transitions provides strong evidence against the existence of such a hypothetical state.

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