Whereas there is no solid experimental support for either model, recent accurate measurements of isotopic shift of the transition temperature Tc upon boron and carbon isotopic substitutions favor the BCS theory.
2.
Along with Gregory Breit, Bramley was the first to calculate the effect of extended nuclear charge on hyperfine structure and isotopic shift an effect still known as the " Breit-Rosenthal correction ".
3.
Yes I have seen that paper and I remember seeing that spectrum ( if I recall it was the lowest reaching spectrum of the band that I found anywhere ) but looking at where it appears to slope down to 0 at about 590nm ( though obviously I can't be certain that's where it really ends ) that would mean the isotopic shift for deuterium would have to be in excess of ~ 30nm since in my spectrum it cuts off at around 560nm!
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