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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentVolume 570, Issue 3, 21 January 2007, Pages 498-510
doi:10.1016/j.nima.2006.10.186 | How to Cite or Link Using DOI
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Resolution function in deep inelastic neutron
scattering using the Foil Cycling Technique
A. Pietropaoloa, , , C. Andreanib, A. Filabozzib, E. Pacec, R. Senesib aConsiglio Nazionale delle Ricerche-INFM UdR Tor Vergata, via della
Ricerca Scientifica 1, I-00133 Roma, Italy
bDipartimento di Fisica, Università degli Studi di Roma Tor Vergata, via della Ricerca Scientifica 1, I-00133 Roma, Italy
cDipartimento di Fisica, Università degli Studi di Roma Tor Vergata and INFN sezione Tor Vergata, via della Ricerca Scientifica 1, I-00133 Roma, Italy
Received 4 July 2006; revised 3 October 2006; Accepted 23 October 2006. Available online 16 November 2006.
Abstract
New perspectives for epithermal neutron spectroscopy are being opened up by the development of the Resonance Detector (RD) and its use on inverse geometry time of flight (TOF) spectrometers at spallation sources. The most recent result is the Foil Cycling Technique (FCT), which has been developed and applied on the VESUVIO spectrometer operating in the RD configuration. This technique has demonstrated its capability to improve the resolution function of the spectrometer and to provide an effective neutron and gamma background subtraction method. This paper reports a detailed analysis of the line shape of the resolution function in Deep Inelastic Neutron Scattering (DINS) measurements on VESUVIO spectrometer, operating in the RD configuration and employing the FCT. The aim is to provide an analytical approximation for the analyzer energy transfer function, an useful tool for data analysis on VESUVIO. Simulated and experimental results of DINS
measurements on a lead sample are compared. The line shape analysis shows that the most reliable analytical approximation of the energy transfer function is a sum of a Gaussian and a power of a Lorentzian. A comparison with the Double Difference Method (DDM) is also discussed. It is shown that the energy resolution improvement for the FCT and the DDM is almost the same, while the counting efficiency is a factor of about 1.4 higher for the FCT.
PACS: 28.20.Rc; 29.30.Hs; 29.40.Mc
Keywords: Resonance; Epithermal neutrons; Neutron scattering;
!
-DetectorArticle Outline
1. Introduction
2. DINS measurements on VESUVIO
3. Analyzer transfer functions
3.1. Standard RD configuration
3.2. Transfer function for the Foil Cycling Technique
4. Line shape analysis: Analytical approximation of the transfer function
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Article Figures/Tables ReferencesOn the analysis of deep inelastic neutron scattering ex... Physica B: Condensed Matter
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5. Simulations and experiment
6. Comparison with Double Difference Method
7. Discussion and conclusions Acknowledgments
Appendix A. The Resonance Detector operational mechanism References
Corresponding author. Fax: +39 06 20 23 507.
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Copyright © 2006 Elsevier B.V. All rights reserved.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
