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Phys. Rev. Lett. 59, 355–358 (1987)

[Issue 3 – 20 July 1987 ]

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Nuclear Bragg scattering of synchrotron radiation with strong speedup of coherent decay, measured on antiferromagnetic ⁵⁷FeBO₃

U. van Bürck and R. L. Mössbauer

Physik-Department E15, Technische Universität München, D-8046 Garching, Federal Republic of Germany

E. Gerdau, R. Rüffer, and R. Hollatz

II. Institut fr Experimentalphysik, Universität Hamburg, D-2000 Hamburg 50, Federal Republic of Germany

G. V. Smirnov

I. V. Kurchatov Institute of Atomic Energy, Moscow, USSR

J. P. Hannon

Physics Department, Rice University, Houston, Texas 77001

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 ⁵⁷FeBo₃. 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 ⁵⁷FeBO₃. .AE

©1987 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v59/p355
DOI: 10.1103/PhysRevLett.59.355
PACS: 75.50.Gg, 07.85.+n, 42.10.Qj, 76.80.+y

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13. For simplicity we have dropped the higher-order modifications which take into account the epsilon shifts of the transition energies given in Fig. 1, which are unimportant for the present discussion.
14. Here we have suppressed a factor f( delta Theta, t ) which vanishes as delta Theta -> 0, and which varies slowly in time relative to the other factors. A detailed discussion will be published elsewhere.

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