Gamma background characterization on VESUVIO: before and after the moderator upgrade

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

doi:10.1088/1742-6596/1055/1/012009

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…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 [30] where the spectra collected by the GS20 can be affected by an important environmental gamma background [87][88][89], 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

J. Phys.: Condens. Matter

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The experimental thermal neutron cross sections of the 20 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.

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Section: Resultsmentioning

confidence: 99%

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

Romanelli

Onorati

Ulpiani

et al. 2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…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

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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.

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“…25 Photon-sensitive detectors count the prompt radiation following the resonant capture of the neutron, together with the additional background radiation arising from the neutron interaction with blockhouse elements. [25][26][27][28][29][30][31] Figure 1 shows the photon spectrum as recently measured with a high-purity germanium detector on the INES beamline 32 from a gold sample in correspondence of the resonance at 4.9 eV, in red, and outside the resonance, in black. The insert indicates the presence of the main gamma lines from gold after the background correction of the red plot.…”

Section: Introductionmentioning

confidence: 93%

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

Ulpiani

Romanelli

Onorati

et al. 2019

Review of Scientific Instruments

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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.

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Gamma background characterization on VESUVIO: before and after the moderator upgrade

Cited by 8 publications

References 8 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

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

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

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