Distinguishing new science from calibration effects in the electron-volt neutron spectrometer VESUVIO at ISIS

Chatzidimitriou-Dreismann, C.A, Gray, E. MacA., & Blach, T.P. (2012) Distinguishing new science from calibration effects in the electron-volt neutron spectrometer VESUVIO at ISIS. Nuclear Instruments and Methods in Physics Research A : Accelerators, Spectrometers, Detectors and Associated Equipment, 676, pp. 120-125.

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Abstract

The "standard" procedure for calibrating the Vesuvio eV neutron spectrometer at the ISIS neutron source, forming the basis for data analysis over at least the last decade, was recently documented in considerable detail by the instrument’s scientists. Additionally, we recently derived analytic expressions of the sensitivity of recoil peak positions with respect to fight-path parameters and presented neutron–proton scattering results that together called in to question the validity of the "standard" calibration. These investigations should contribute significantly to the assessment of the experimental results obtained with Vesuvio.

Here we present new results of neutron–deuteron scattering from D2 in the backscattering angular range (theata > 90 degrees) which are accompanied by a striking energy increase that violates the Impulse Approximation, thus leading unequivocally the following dilemma: (A) either the "standard" calibration is correct and then the experimental results represent a novel quantum dynamical effect of D which stands in blatant contradiction of conventional theoretical expectations; (B) or the present "standard" calibration procedure is seriously deficient and leads to artificial outcomes.

For Case(A), we allude to the topic of attosecond quantumdynamical phenomena and our recent neutron scattering experiments from H2 molecules. For Case(B),some suggestions as to how the "standard" calibration could be considerably improved are made.

Impact and interest:

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ID Code: 58914
Item Type: Journal Article
Refereed: Yes
Keywords: Neutron Compton scattering, Deep inelastic neutron scattering, Time-of-flight, Calibration, Attosecond physics
DOI: 10.1016/j.nima.2012.02.025
ISSN: 1872-9576
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > QUANTUM PHYSICS (020600) > Quantum Physics not elsewhere classified (020699)
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 05 Apr 2013 00:43
Last Modified: 30 Oct 2013 03:40

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