High-intensity {gamma}-ray scattering from alkali halide crystals

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.7308· OSTI ID:123606

Wagoner, R A; Mullen, J G ^[1]

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1. Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States)

We have measured the fractional change {ital F} of the resonant photon fraction due to Bragg scattered from the (200), (400), and (600) planes of NaCl and NaF, as well as the (200) and (400) planes of LiF. Unlike previous measurements of this type, we have used well-collimated beams made possible by a high-intensity {gamma}-ray source ({approx}100 Ci). The values of {ital F} reflect loss in elastic intensity and are of importance since the crystals studied here are widely used as monochromating filters. We find a remarkably large fraction of the scattered radiation remains recoilless ({gt}94%), even for the (600) reflection of NaCl, and a value of {ital F}=100.0(3%) for the (200) plane of LiF shows that this crystal is an excellent {gamma}-ray monochromator and calibration for experiments with small {ital F} values. The {ital F} values can be expressed in terms of elastic and inelastic components, and as such provide information about the Debye-Waller factors of crystals.

• DOE Contract Number: FG02-85ER45199
• OSTI ID: 123606
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BRAGG REFLECTION
DEBYE-WALLER FACTOR
GAMMA RADIATION
MOESSBAUER EFFECT
SODIUM CHLORIDES
SODIUM FLUORIDES