Comment on "Hypersharp Resonant Capture of Neutrinos as a Laboratory Probe of the Planck Length"

Details Comment on "Hypersharp Resonant Capture of Neutrinos as a Laboratory Probe of the Planck Length" Comment on "Hypersharp Resonant Capture of Neutrinos as a Laboratory Probe of the Planck Length"

2009-08-27

arxiv.org/abs/0908.3985v1

Phys.Rev.Lett.103:099101,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevLett.103.099101

In Phys. Rev. Lett. 102, 091804 (2009) [arXiv:0903.0787], R.S. Raghavan claims that due to motional averaging by lattice vibrations, 18.6 keV electron antineutrinos emitted/captured without recoil from 2-body decay in the 3H/3He system embedded in Nb metal will be observable with natural width. In this comment we argue that 1) stochastic relaxation processes and 2) inhomogeneities in the metal matrices will prevent the generation of antineutrinos with natural width in the 3H/3He system, 3) the different lattice-deformation energies of 3H and 3He in the Nb matrix will drastically decrease the fraction of phononless emission/detection of antineutrinos, 4) the age itself of the 3H source does not affect the linewidth.

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