A gamma-ray diffraction instrument for high-intensity Mössbauer sources

W. B. Yelon; G. Schupp; M. L. Crow; C. Holmes; J. G. Mullen

doi:10.1016/0168-583X(86)90603-8

A gamma-ray diffraction instrument for high-intensity Mössbauer sources

W. B. Yelon, G. Schupp, M. L. Crow, C. Holmes, J. G. Mullen

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

A Mössbauer gamma-ray diffraction instrument has been developed which utilizes high intensity sources produced by neutron irradiation. Most of the early work has used 70 Ci, 5.1 d ¹⁸³Ta sources produced by double neutron capture which yield 12 × 10¹⁰ photons/s for the 46.5 keV Mössbauer transition in ¹⁸³W. A dewar is enclosed in the shielding cask which allows sources to be cooled to 77 K. Samples are located approximately midway between source and detector, which are separated by 155 cm. Collimators in front of the sample and detector commonly limit the beam to 3 mm wide by 25 mm high. A 27% minimum is seen in the velocity spectrum for the 46.5 keV photons scattered from the 200 Bragg reflection in LiF taken in transmission. Enriched, room temperature absorbers mounted on a rotor can be Doppler-shifted up to 17 meV. Q-space resolution of 0.01 Å^-1 is significantly better than that reported by other groups using Mössbauer scattering. When a microfoil internal conversion electron (MICE) detector is used, the instrument has the potential for directly measuring the energy transferred by the inelastically scattered photons, especially for low energy excitations in solids which require high energy resolution.

Original language	English
Pages (from-to)	341-347
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	14
Issue number	3
DOIs	https://doi.org/10.1016/0168-583X(86)90603-8
State	Published - Mar 2 1986
Externally published	Yes

Funding

* This material was prepared with the support of the US Department of Energy, Grant Nos. DE-AC02-83ER 45017, DE-FGO2-85ER 45200, and DE-FGO2-85ER 45199 AOO. However, any opinions, findings, conclusions, or rec-ommendations expressed herein are those of the authors and do not necessarily reflect the views of DOE.

Funders	Funder number
US Department of Energy

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abstract = "A M{\"o}ssbauer gamma-ray diffraction instrument has been developed which utilizes high intensity sources produced by neutron irradiation. Most of the early work has used 70 Ci, 5.1 d 183Ta sources produced by double neutron capture which yield 12 × 1010 photons/s for the 46.5 keV M{\"o}ssbauer transition in 183W. A dewar is enclosed in the shielding cask which allows sources to be cooled to 77 K. Samples are located approximately midway between source and detector, which are separated by 155 cm. Collimators in front of the sample and detector commonly limit the beam to 3 mm wide by 25 mm high. A 27% minimum is seen in the velocity spectrum for the 46.5 keV photons scattered from the 200 Bragg reflection in LiF taken in transmission. Enriched, room temperature absorbers mounted on a rotor can be Doppler-shifted up to 17 meV. Q-space resolution of 0.01 {\AA}-1 is significantly better than that reported by other groups using M{\"o}ssbauer scattering. When a microfoil internal conversion electron (MICE) detector is used, the instrument has the potential for directly measuring the energy transferred by the inelastically scattered photons, especially for low energy excitations in solids which require high energy resolution.",

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AU - Yelon, W. B.

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AU - Crow, M. L.

AU - Holmes, C.

AU - Mullen, J. G.

PY - 1986/3/2

Y1 - 1986/3/2

N2 - A Mössbauer gamma-ray diffraction instrument has been developed which utilizes high intensity sources produced by neutron irradiation. Most of the early work has used 70 Ci, 5.1 d 183Ta sources produced by double neutron capture which yield 12 × 1010 photons/s for the 46.5 keV Mössbauer transition in 183W. A dewar is enclosed in the shielding cask which allows sources to be cooled to 77 K. Samples are located approximately midway between source and detector, which are separated by 155 cm. Collimators in front of the sample and detector commonly limit the beam to 3 mm wide by 25 mm high. A 27% minimum is seen in the velocity spectrum for the 46.5 keV photons scattered from the 200 Bragg reflection in LiF taken in transmission. Enriched, room temperature absorbers mounted on a rotor can be Doppler-shifted up to 17 meV. Q-space resolution of 0.01 Å-1 is significantly better than that reported by other groups using Mössbauer scattering. When a microfoil internal conversion electron (MICE) detector is used, the instrument has the potential for directly measuring the energy transferred by the inelastically scattered photons, especially for low energy excitations in solids which require high energy resolution.

AB - A Mössbauer gamma-ray diffraction instrument has been developed which utilizes high intensity sources produced by neutron irradiation. Most of the early work has used 70 Ci, 5.1 d 183Ta sources produced by double neutron capture which yield 12 × 1010 photons/s for the 46.5 keV Mössbauer transition in 183W. A dewar is enclosed in the shielding cask which allows sources to be cooled to 77 K. Samples are located approximately midway between source and detector, which are separated by 155 cm. Collimators in front of the sample and detector commonly limit the beam to 3 mm wide by 25 mm high. A 27% minimum is seen in the velocity spectrum for the 46.5 keV photons scattered from the 200 Bragg reflection in LiF taken in transmission. Enriched, room temperature absorbers mounted on a rotor can be Doppler-shifted up to 17 meV. Q-space resolution of 0.01 Å-1 is significantly better than that reported by other groups using Mössbauer scattering. When a microfoil internal conversion electron (MICE) detector is used, the instrument has the potential for directly measuring the energy transferred by the inelastically scattered photons, especially for low energy excitations in solids which require high energy resolution.

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A gamma-ray diffraction instrument for high-intensity Mössbauer sources

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