3He in the presence of 4He"" />
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|Author(s):||Thomas R. Gentile; M E. Hayden; P.J. Nacher; A K. Petukhov; B Saam; T G. Walker;|
|Title:||Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized 3He in the presence of 4He"|
|Published:||July 24, 2013|
|Abstract:||H.H. Chen et al  claim that adding 4He to spin-exchange optical pumping (SEOP) cells confines 3He atoms to a diffusion-limited region, which effectively reduces the wall relaxation factor X. Here X is a phenomenological parameter used to characterize typical SEOP cells; it quantifies the observation that the measured linear slope of the relaxation rate with alkali density exceeds the spin-exchange rate. In addition they claim to demonstrate that magnetic field gradients cause a diffusive motion of 3He. We argue that these claims and other central conclusions drawn by the the authors of  are unjustified and/or unphysical. We also draw attention to several additional issues and shortcomings associated with the results, analysis, and presentation of data in  that confound clear interpretation."|
|Citation:||Physical Review A|
|Pages:||pp. 017401-1 - 017401-3|
|Keywords:||He3, He4, spin-exchange optical pumping,|
|Research Areas:||Radiation Physics, Neutron Research|