The point about the rotation rate of the solar core is merely a corollary from their hypothesis. The hypothesis is that the variation in the radioactive decay rate is caused by solar neutrinos. The experimental evidence supports most aspects of this hypothesis, except that they were expecting a somewhat faster period. Given the facts that the surface of the sun rotates once every 28 days and that our period is caused by the solar core, whose exact rotation rate is unknown, it is not unreasonable to suppose this is the first evidence to show that the rotation rate of the core of the sun is somewhat lower than that of the surface. A resulting period of 1 hour or one year would have been reason to suspect the hypothesis was wrong. As it stands, they have every reason to suppose their hypothesis is right.
Comments
The point about the rotation rate of the solar core is merely a corollary from their hypothesis. The hypothesis is that the variation in the radioactive decay rate is caused by solar neutrinos. The experimental evidence supports most aspects of this hypothesis, except that they were expecting a somewhat faster period. Given the facts that the surface of the sun rotates once every 28 days and that our period is caused by the solar core, whose exact rotation rate is unknown, it is not unreasonable to suppose this is the first evidence to show that the rotation rate of the core of the sun is somewhat lower than that of the surface. A resulting period of 1 hour or one year would have been reason to suspect the hypothesis was wrong. As it stands, they have every reason to suppose their hypothesis is right.