Enhancement of counting statistics and noise reduction in the forward-scattering detectors on the VESUVIO spectrometer

Ulpiani, Pierfrancesco; Romanelli, Giovanni; Arcidiacono, Laura; Onorati, Dalila; Festa, G.; Krzystyniak, M.; Schooneveld, E.M.; Fernandez-Alonso, Félix; Senesi, R.

doi:10.1088/1742-6596/1055/1/012008

Cited by 7 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Importantly, the new GEM detector allows a more precise determination of σ (E) in two key regions. First, more accurate data are obtained at energies between 0.6 meV and 3 meV, using the empty-pulse at ISIS Target Station 1 28 where the spectra collected by the GS20 can be affected by an important environmental gamma background [86][87][88] , especially for samples with high scattering power. Yet, owing to the lower sensitivity to γ-rays provided by the GEM detector, the data collected with this new addition are of exquisite quality.…”

Section: Resultsmentioning

confidence: 99%

Thermal neutron cross sections of amino acids from average contributions of functional groups

Romanelli,

Onorati,

Ulpiani

et al. 2021

Preprint

View full text Add to dashboard Cite

The experimental thermal neutron cross sections of the twenty proteinogenic amino acids have been measured over the incident-neutron energy range spanning from 1 meV to 10 keV and data have been interpreted using the multi-phonon expansion based on first-principles calculations. The scattering cross section, dominated by the incoherent inelastic contribution from the hydrogen atoms, can be rationalised in terms of the average contributions of different functional groups, thus neglecting their correlation. These results can be used for modelling the total neutron cross sections of complex organic systems like proteins, muscles, or human tissues from a limited number of starting input functions. This simplification is of crucial importance for fine-tuning of transport simulations used in medical applications, including boron neutron capture therapy as well as secondary neutrons-emission induced during proton therapy. Moreover, the parametrized neutron cross sections allow a better treatment of neutron scattering experiments, providing detailed sample self-attenuation corrections for a variety of biological and soft-matter systems.

show abstract

Section: Resultsmentioning

confidence: 99%

Thermal neutron cross sections of amino acids from average contributions of functional groups

Romanelli,

Onorati,

Ulpiani

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Traditionally, NCS has been particularly useful in the study of hydrogenous matter [ 41 ], yet at the same time the technique continues to be extended to heavier elements under the wider umbrella of MAss-resolved Neutron SpEctroscopic (MANSE) techniques [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Neutron spectrometers in a so-called inverted-geometry configuration at a pulsed source represent the most natural way to implement NCS and MANSE, as exemplifed by the current science programme on the VESUVIO spectrometer (ISIS, UK) [ 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ], although it is also to be noted that other approaches have been attempted in the past [ 60 , 61 , 62 ].…”

Section: Overviewmentioning

confidence: 99%

Dynamics & Spectroscopy with Neutrons—Recent Developments & Emerging Opportunities

2021

View full text Add to dashboard Cite

This work provides an up-to-date overview of recent developments in neutron spectroscopic techniques and associated computational tools to interrogate the structural properties and dynamical behavior of complex and disordered materials, with a focus on those of a soft and polymeric nature. These have and continue to pave the way for new scientific opportunities simply thought unthinkable not so long ago, and have particularly benefited from advances in high-resolution, broadband techniques spanning energy transfers from the meV to the eV. Topical areas include the identification and robust assignment of low-energy modes underpinning functionality in soft solids and supramolecular frameworks, or the quantification in the laboratory of hitherto unexplored nuclear quantum effects dictating thermodynamic properties. In addition to novel classes of materials, we also discuss recent discoveries around water and its phase diagram, which continue to surprise us. All throughout, emphasis is placed on linking these ongoing and exciting experimental and computational developments to specific scientific questions in the context of the discovery of new materials for sustainable technologies.

show abstract

“…configurations are normalized to the proton charge accumulated in the synchrotron, so as to show the increase in the count rate of a factor ∼3. The green spectrum in the bottom and the red one in the middle panel are, instead, unit-area normalized so as to stress the reduction of ∼40% of the error bars when the LLDT is lowered, 35 and prompt-gamma rays from the gold resonance in the range between E 0 and 600 keV are also included. Smaller count-rate increases were observed for the other detectors with modified LLDTs, as reported in Table I.…”

Section: Fig 3 Spectra From Detectormentioning

confidence: 99%

“…34 Preliminary results presented in Ref. 35 suggest that the instrument sensitivity can be improved by setting the LLDT to a lower value, so as to detect intense photon peaks in the energy region from 60 keV to 300 keV, as evidenced in the insert of the same figure.…”

Section: Introductionmentioning

confidence: 97%

Optimization of detection strategies for epithermal neutron spectroscopy using photon-sensitive detectors

Ulpiani

Romanelli

Onorati

et al. 2019

Review of Scientific Instruments

View full text Add to dashboard Cite

In this work, we discuss an improved detection procedure for the photon-sensitive yttrium-aluminum-perovskite detectors installed on the VESUVIO spectrometer at the ISIS pulsed neutron and muon source. By decreasing the low-level energy threshold of detected photons, we observe an increased count rate up to a factor ∼3, and a decrease of relative error bars and noise of ∼40% and 35%, respectively, for deep inelastic neutron scattering measurements. In addition, we demonstrate how the reported optimization may increase the accuracy in the line shape analysis of neutron Compton profiles, as well as in the application of the mean-force approach to detect the anisotropy and anharmonicity in the single-particle local potential. We envisage that such an upgrade of the detection procedure would have a substantial impact on the VESUVIO scientific programme based on deep inelastic neutron scattering investigations.

show abstract

Enhancement of counting statistics and noise reduction in the forward-scattering detectors on the VESUVIO spectrometer

Cited by 7 publications

References 17 publications

Thermal neutron cross sections of amino acids from average contributions of functional groups

Thermal neutron cross sections of amino acids from average contributions of functional groups

Dynamics & Spectroscopy with Neutrons—Recent Developments & Emerging Opportunities

Optimization of detection strategies for epithermal neutron spectroscopy using photon-sensitive detectors

Contact Info

Product

Resources

About