[time-nuts] Re: Scandium plus hard x-rays

[Richard Karlquist]

A nuclear clock may be less susceptible to various perturbations, but
will still have a frequency that is a function of gravity, as per
relativity. 

Has a way of measuring gravity been developed that would be accurate
enough to make such a nuclear clock as accurate as this article is
saying? 

---
Rick Karlquist
N6RK 

On 2023-10-02 11:18, shouldbe q931 via time-nuts wrote:

> https://www.nature.com/articles/s41586-023-06491-w
> 
> "We foresee the development of a Sc-based nuclear clock in the future"
> 
> However
> 
> "Every X-ray pulse train with an energy of about 65 mJ heats the 25-μm
> thick Sc-metal target by an estimated temperature of about 100 K. The
> heat conductivity of Sc metal is low--15.8 W m-1 K-1, comparable to
> that of stainless steel. Radiation damage to the target is thus
> inevitable. Special measures were taken to avoid damage, including
> water and air cooling, defocusing of the beam (the beam footprint was
> about 2 mm2) and periodic replacement of the target. Two targets had
> to be replaced in the course of the experiment because of partial
> radiation damage."
> 
> Methinks that's a fairly critical issue (-:
> 
> Cheers
> 
> Arne
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