Nuclear Bragg scattering of synchrotron radiation with strong speedup of coherent decay, measured on antiferromagnetic $\mathrm{^{57}FeBO_3}$
- van Bürck, U.
- Mössbauer, R. L.
- Gerdau, E.
- Rüffer, R.
- Hollatz, R.
- Smirnov, G. V.
- Hannon, J. P.
DOIAbstract
A strongly speeded-up decay of a collective nuclear excitation has been observed in pure nuclear resonance diffraction of synchrotron-radiation pulses by a perfect single crystal of antiferromagnetic $^{57}$FeBO$_3$. Superimposed appeared a quantum-beat spectrum exhibiting the interference of four hyperfine transitions. The angular dependence of the time spectrum was verified with measurements above, below, and at the exact Bragg position. The off-Bragg measurements reveal sensitively the weak quadrupole interaction in $^{57}$FeBO$_3$. .A
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