Double absorber Moessbauer spectroscopy in 183W

We have completed a Moessbauer effect (ME) experiment using two absorbers, one stationary and one Doppler shifted, as a means of enhancing the off-resonant signal, in order to confirm earlier measurements in 183W done using single absorbers. A parameter of particular importance is the interference parameter, β, which is relevant to understanding certain time reversal invariance experiments, and which our previous measurements indicated was larger in magnitude than that predicted by theory. The value for 100β reported here is -0.318(5), which is in excellent agreement with our earlier value and is larger in magnitude than that predicted by theory. (orig.)