Nuclear forward scattering of synchrotron radiation

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.6207· OSTI ID:7252390

van Buerck, U; Siddons, D P; Hastings, J B; Bergmann, U; Hollatz, R ^[1]

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1. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)

The coherent nuclear reemission in the forward direction has been measured following excitation of the Moessbauer transitions in polycrystalline {sup 57}Fe foils by synchrotron radiation. The excited resonances are sufficiently narrow in energy that the time dependence of their decay can be straightforwardly observed, and in particular the details of the collective response to single-photon excitation can be studied. The collective nuclear scattering conditions were varied directly over a large range by using foil thicknesses between 0.5 and 28.5 {mu}m. The envelope of the time evolution showed significant changes with increasing foil thickness. For thin foils (up to 3 {mu}m) the envelope was exponential in the observed time window, with a decay time decreasing with increasing foil thickness. For thicker foils an oscillatory modulation of the envelope and a significant shift in the phase of the beat pattern were observed. A simple optical model can explain all the observed phenomena.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7252390
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BREMSSTRAHLUNG
COLLECTIVE EXCITATIONS
CRYSTALS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION
INTERMEDIATE MASS NUCLEI
IRON 57
IRON ISOTOPES
ISOTOPES
MOESSBAUER EFFECT
NUCLEI
POLYCRYSTALS
RADIATIONS
STABLE ISOTOPES
SYNCHROTRON RADIATION