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79 results on '"Micieli, D"'

44. A neutron study of sealed pottery from the grave-goods of Kha and Merit.

Author

Andreani, C., Aliotta, F., Arcidiacono, L., Borla, M., Di Martino, D., Facchetti, F., Ferraris, E., Festa, G., Gorini, G., Kockelmann, W., Kelleher, J., Malfitana, D., Micieli, D., Minniti, T., Cippo, E. Perelli, Ponterio, R., Salvato, G., Senesi, R., Turina, V., and Vasi, C.

Subjects
NEUTRONS, GRAVE goods, ALABASTER, RADIOGRAPHY, POTTERY
Abstract

This work presents the first neutron characterization of artefacts from the grave-goods of Kha and Merit, a unique cultural treasure of mankind and preserved at the Museo Egizio in Turin. This magnificent collection, discovered in the early years of the last century, includes an impressive amount of artefacts such as coffins, textiles, metallic and ceramic pottery, and alabaster containers. The present study investigates two sealed potteries, using enhanced Neutron Tomography, Radiography, and Prompt Gamma Activation Analysis techniques. The neutron probe provides access to the morphological reconstructions of the inner parts of the vases and to map, with unprecedented details, the elemental composition of the surfaces and bulk areas of the potteries. The present work extends the knowledge to hitherto unknown contents of the sealed vases unlocking their secrets. [ABSTRACT FROM AUTHOR]

Published
2017
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46. Accelerating Neutron Tomography experiments through Artificial Neural Network based reconstruction

Author

Llion Evans, Giuseppe Gorini, D. Micieli, Triestino Minniti, Micieli, D, Minniti, T, Evans, L, and Gorini, G

Subjects
0301 basic medicine, Multidisciplinary, Artificial neural network, Image quality, Computer science, Neutron tomography, lcsh:R, lcsh:Medicine, Iterative reconstruction, Function (mathematics), Article, Set (abstract data type), 03 medical and health sciences, Range (mathematics), 030104 developmental biology, 0302 clinical medicine, neutron tomography, lcsh:Q, lcsh:Science, Algorithm, 030217 neurology & neurosurgery
Abstract

Neutron Tomography (NT) is a non-destructive technique to investigate the inner structure of a wide range of objects and, in some cases, provides valuable results in comparison to the more common X-ray imaging techniques. However, NT is time consuming and scanning a set of similar objects during a beamtime leads to data redundancy and long acquisition times. Nowadays NT is unfeasible for quality checking study of large quantities of similar objects. One way to decrease the total scan time is to reduce the number of projections. Analytical reconstruction methods are very fast but under this condition generate streaking artifacts in the reconstructed images. Iterative algorithms generally provide better reconstruction for limited data problems, but at the expense of longer reconstruction time. In this study, we propose the recently introduced Neural Network Filtered Back-Projection (NN-FBP) method to optimize the time usage in NT experiments. Simulated and real neutron data were used to assess the performance of the NN-FBP method as a function of the number of projections. For the first time a machine learning based algorithm is applied and tested for NT image reconstruction problem. We demonstrate that the NN-FBP method can reliably reduce acquisition and reconstruction times and it outperforms conventional reconstruction methods used in NT, providing high image quality for limited datasets.

Published
2019
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47. Matter from light-light scattering via Breit-Wheeler events produced by two interacting Compton sources

Author

Illya Drebot, D. Micieli, Edoardo Milotti, Vittoria Petrillo, Luca Serafini, E. Tassi, Drebot, Illya, Micieli, D., Milotti, Edoardo, Petrillo, V., Tassi, E., and Serafini, L.

Subjects
Nuclear and High Energy Physics, Particle physics, particle accelerator, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron, 01 natural sciences, Light scattering, law.invention, Nuclear physics, law, 0103 physical sciences, quantum electrodynamics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Collider, Compton backscattering, particle accelerator, Physics, 010308 nuclear & particles physics, Scattering, Compton scattering, Gamma ray, Surfaces and Interfaces, photon-photon scattering, Compton backscattering, Pair production, Physics::Accelerator Physics, lcsh:QC770-798, Energy (signal processing)
Abstract

We present the dimensioning of a photon-photon collider based on Compton gamma sources for the observation of Breit-Wheeler pair production and QED $\ensuremath{\gamma}\ensuremath{\gamma}$ events. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two gamma ray beams through Compton back scattering with two J-class lasers. Tuning the system energy above the Breit-Wheeler cross section threshold, a flux of electron-positron pairs is generated out of light-light interaction. The process is analyzed by start-to-end simulations. Realistic numbers of the secondary particle yield, referring to existing state-of-the-art set-ups and a discussion of the feasibility of the experiment taking into account the background signal are presented.

Published
2017

48. A neutron study of sealed pottery from the grave-goods of Kha and Merit

Author

C. Andreani, beg F. Aliotta, b L. Arcidiacono, e M. Borla, f D. Di Martino, h F. Facchetti, d E. Ferraris, d G. Festa, e G. Gorini, h W. Kockelmann, j J. Kelleher, j D. Malfitana, a D. Micieli, i T. Minniti, j E. Perelli Cippo, c R. Ponterio, b G. Salvato, b R. Senesi, beg V. Turina, d C. Vasi, b, C. Greco, d, Andreani, C, Aliotta, F, Arcidiacono, L, Borla, M, Di Martino, D, Facchetti, F, Ferraris, E, Festa, G, Gorini, G, Kockelmann, W, Kelleher, J, Malfitana, D, Micieli, D, Minniti, T, Cippo, E, Ponterio, R, Salvato, G, Senesi, R, Turina, V, Vasi, C, and Greco, C

Subjects
0301 basic medicine, Elemental composition, Grave goods, 010308 nuclear & particles physics, media_common.quotation_subject, Neutron tomography, Metallurgy, pottery, Art, engineering.material, 01 natural sciences, Archaeology, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), Analytical Chemistry, 03 medical and health sciences, Alabaster, neutron, 030104 developmental biology, 0103 physical sciences, engineering, Neutron, Pottery, Treasure, Spectroscopy, media_common
Abstract

This work presents the first neutron characterization of artefacts from the grave-goods of Kha and Merit, a unique cultural treasure of mankind and preserved at the Museo Egizio in Turin. This magnificent collection, discovered in the early years of the last century, includes an impressive amount of artefacts such as coffins, textiles, metallic and ceramic pottery, and alabaster containers. The present study investigates two sealed potteries, using enhanced Neutron Tomography, Radiography, and Prompt Gamma Activation Analysis techniques. The neutron probe provides access to the morphological reconstructions of the inner parts of the vases and to map, with unprecedented details, the elemental composition of the surfaces and bulk areas of the potteries. The present work extends the knowledge to hitherto unknown contents of the sealed vases unlocking their secrets.

Published
2017
Full Text
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49. Study of photon–photon scattering events

Author

Illya Drebot, D. Micieli, Edoardo Milotti, Alberto Bacci, Vittoria Petrillo, M. Rossetti Conti, E. Tassi, Andrea Rossi, Luca Serafini, Drebot, I., Bacci, A., Micieli, D., Milotti, Edoardo, Petrillo, V., Conti, M. Rossetti, Rossi, A. R., Tassi, E., and Serafini, L.

Subjects
Physics, Nuclear and High Energy Physics, Photon, Compton, Gamma, Sources, 010308 nuclear & particles physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Detector, Gamma ray, Compton scattering, Electron, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, Physics::Accelerator Physics, 010306 general physics, Collider, Instrumentation
Abstract

We present the design of a photon–photon collider based on conventional Compton gamma sources for the observation of secondary γ γ production. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton back scattering with two high energy lasers. Tuning the system energy to the energy of the photon–photon cross section maximum, a flux of secondary gamma photons is generated. The process is analyzed by start-to-end simulations from the photocathodes to the propagation of the QED photons towards the detector. The new Monte Carlo code ‘Rate Of Scattering Events’ (ROSE) has been developed ad hoc for the counting of the QED events. Realistic numbers of the secondary gamma yield, referring to existing or approved set-ups and a discussion of the feasibility of the experiment are presented.

Published
2017

50. Compton sources for the observation of elastic photon-photon scattering events

Author

Alberto Bacci, Luca Serafini, Edoardo Milotti, E. Tassi, Vittoria Petrillo, M. Rossetti Conti, Illya Drebot, D. Micieli, Andrea Rossi, Micieli, D., Drebot, I., Bacci, A., Milotti, Edoardo, Petrillo, V., Conti, M. Rossetti, Rossi, A. . r., Tassi, E., and Serafini, L.

Subjects
Nuclear and High Energy Physics, Photon, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Compton backscattering, gamma rays, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Collider, Physics, 010308 nuclear & particles physics, Scattering, Detector, Gamma ray, Compton scattering, Surfaces and Interfaces, Laser, Compton backscattering, gamma rays, Physics::Accelerator Physics, lcsh:QC770-798
Abstract

We present the design of a photon-photon collider based on conventional Compton gamma sources for the observation of elastic $\ensuremath{\gamma}\ensuremath{\gamma}$ scattering. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton backscattering with two high energy lasers. The elastic photon-photon scattering is analyzed by start-to-end simulations from the photocathodes to the detector. A new Monte Carlo code has been developed ad hoc for the counting of the QED events. Realistic numbers of the secondary gamma yield, obtained by using the parameters of existing or approved Compton devices, a discussion of the feasibility of the experiment and of the nature of the background are presented.

Published
2016

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