A Study on the Calibration of a Time-focused Inelastic Neutron Scattering Spectrometer

Article type: Research Article

Authors: Albertini, V. Rossi | Colognesi, D.^; | Tomkinson, J.

Affiliations: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Via Fosso del Cavaliere, 100, 00133, Rome, Italy | ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK | Gruppo Nazionale Struttura della Materia, Consiglio Nazionale delle Ricerche, Viale dell’ Universita’ 11,00185, Rome, Italy

Note: [] Corresponding author. Fax: +39-06-4993-4153, e-mail: valerio@dns.ism.rm.cnr.it

Abstract: The calibration of a time-focused spectrometer for the analysis of inelastically back-scattered neutrons is discussed. By comparison with a reference spectrum, a non linear system of the kinetic equations for neutrons is obtained and the calibration process is outlined. This provides a deeper understanding of the question of expected inaccuracies on the measured spectra. In particular, the effect on the parameters of a possible misassignment of the reference spectrum features is examined in detail. A suitable molecular crystal (2,5 diiodothiophene) is identified as the recommended calibrant. Using different transitions from the spectrum of this calibrant the inaccuracies introduced by misassignment are assessed.

Keywords: Calibration, Neutron scattering, Spectrometer

DOI: 10.1080/10238160008206329

Journal: Journal of Neutron Research, vol. 8, no. 4, pp. 245-259, 2000