F. Sacchetti
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View article: Fast plasma production by intense femtosecond extreme ultraviolet and x-ray pulses
Fast plasma production by intense femtosecond extreme ultraviolet and x-ray pulses Open
We develop a semiempirical model to describe the creation of an electron plasma in matter at extreme conditions, as excited by high-intensity, extreme ultraviolet (EUV) or x-ray radiation pulses currently available at free-electron laser (…
View article: Experimental data for "Superradiant Thomson scattering from graphite in the extreme ultraviolet"
Experimental data for "Superradiant Thomson scattering from graphite in the extreme ultraviolet" Open
Pretreated experimental data of an extreme ultraviolet (EUV) Thomson scattering experiment on highly oriented pyrolytic graphite (HOPG), described in the PNAS paper "Superradiant Thomson scattering from graphite in the extreme ultraviolet"…
View article: Experimental data for "Superradiant Thomson scattering from graphite in the extreme ultraviolet"
Experimental data for "Superradiant Thomson scattering from graphite in the extreme ultraviolet" Open
Pretreated experimental data of an extreme ultraviolet (EUV) Thomson scattering experiment on highly oriented pyrolytic graphite (HOPG), described in the PNAS paper "Superradiant Thomson scattering from graphite in the extreme ultraviolet"…
View article: Intra-protein interacting collective modes in the terahertz frequency region
Intra-protein interacting collective modes in the terahertz frequency region Open
Understanding how proteins work requires a thorough understanding of their internal dynamics. Proteins support a wide range of motions, from the femtoseconds to seconds time scale, relevant to crucial biological functions. In this context,…
View article: Stability of Human Telomeric G-Quadruplexes Complexed with Photosensitive Ligands and Irradiated with Visible Light
Stability of Human Telomeric G-Quadruplexes Complexed with Photosensitive Ligands and Irradiated with Visible Light Open
Guanine-rich DNA sequences can fold into non-canonical nucleic acid structures called G-quadruplexes (G4s). These nanostructures have strong implications in many fields, from medical science to bottom-up nanotechnologies. As a result, liga…
View article: Complex dynamics in low electron density lithium ammonia solutions. Interacting modes revealed by comparing neutron and x-ray inelastic scattering
Complex dynamics in low electron density lithium ammonia solutions. Interacting modes revealed by comparing neutron and x-ray inelastic scattering Open
We present an experimental study of the collective dynamics of lithium-ammonia solutions in order to
\ninvestigate the role played by the metallic character of the liquid on the atomic dynamics and the relevance
\nof almost free ammonia. T…
View article: Impact of the Environment on the PNIPAM Dynamical Transition Probed by Elastic Neutron Scattering
Impact of the Environment on the PNIPAM Dynamical Transition Probed by Elastic Neutron Scattering Open
By means of elastic incoherent neutron scattering, we investigated how the addition of stabilizing cosolvents (glycerol and glucose) affects the dynamics of hydrated PNIPAM chains at the pico- and nanosecond time scale, where a low-tempera…
View article: Solvent Vibrations as a Proxy of the Telomere G-Quadruplex Rearrangements across Thermal Unfolding
Solvent Vibrations as a Proxy of the Telomere G-Quadruplex Rearrangements across Thermal Unfolding Open
G-quadruplexes (G4s) are noncanonical forms of DNA involved in many key genome functions. Here, we exploited UV Resonance Raman scattering to simultaneously explore the vibrational behavior of a human telomeric G4 (Tel22) and its aqueous s…
View article: Possible realization of a phononic tsunami in a wedge-shaped sample
Possible realization of a phononic tsunami in a wedge-shaped sample Open
Exploiting the theory of solitons in a nonlinear elastic medium we predict a\nnovel phenomenon called a phononic tsunami, which is characterized by the\ndramatic increase of the local amplitude of phonon modes. To elucidate the\npossible e…
View article: Superradiant Thomson scattering from graphite in the extreme ultraviolet
Superradiant Thomson scattering from graphite in the extreme ultraviolet Open
We study the Thomson scattering from highly oriented pyrolitic graphite excited by the extreme ultraviolet, coherent pulses of FERMI free electron laser (FEL). An apparent nonlinear behavior is observed and fully described in terms of the …
View article: Hydrogen-bond network distortion of water in the soft confinement of Nafion membrane
Hydrogen-bond network distortion of water in the soft confinement of Nafion membrane Open
A Compton spectroscopy investigation is carried out in hydrated Nafion membranes, enabling identification of distortions in the hydrogen-bond distribution of the polymer hydrating water by means of the subtle changes reflected by the Compt…
View article: Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals
Future applications of the high-flux thermal neutron spectroscopy: the ever-green case of collective excitations in liquid metals Open
The European landscape of neutron sources for research applications is changing and the major European joint effort, the European Spallation Source (ESS) currently under construction in Lund (Sweden), is progressing. The high flux source E…
View article: Polymorphism of human telomeric quadruplexes with drugs: a multi-technique biophysical study
Polymorphism of human telomeric quadruplexes with drugs: a multi-technique biophysical study Open
A multi-technique biophysical method is used to study the ligand binding to G-quadruplex DNA.
View article: Creativity as a Methodological dimension of Social Research between Quantity and Quality
Creativity as a Methodological dimension of Social Research between Quantity and Quality Open
In this work I address creativity in the process of social sciences research, comparing quantitative and qualitative approaches. In discussing creativity I go back to Chomsky and his distinction between rule-governed and rule-changing crea…
View article: Structure of human telomere G-quadruplex in the presence of a model drug along the thermal unfolding pathway
Structure of human telomere G-quadruplex in the presence of a model drug along the thermal unfolding pathway Open
A multi-technique approach, combining circular dichroism spectroscopy, ultraviolet resonance Raman spectroscopy and small angle scattering techniques, has been deployed to elucidate how the structural features of the human telomeric G-quad…
View article: Pulse shape analysis of neutron signals in Si-based detectors
Pulse shape analysis of neutron signals in Si-based detectors Open
A series of test experiments on three different Si-based neutron detectors, namely a 1-d 128 channel, 0.5 mm space resolution Si microstrip sensor coupled to natural Gd converter, a medium size ? 1 cm2 PIN diode coupled to nGd2O3 or 157Gd2…
View article: Hydration-dependent dynamics of human telomeric oligonucleotides investigated by inelastic neutron scattering
Hydration-dependent dynamics of human telomeric oligonucleotides investigated by inelastic neutron scattering Open
The functionality of biomolecules, such as DNA, is related not only to the structural but also to the dynamical properties. The activation of fast structural fluctuations on the pico- and nanosecond time windows enables slower conformation…
View article: La ricerca visuale riflessiva tra produzione e ricezione: spunti dall’approccio culturale
La ricerca visuale riflessiva tra produzione e ricezione: spunti dall’approccio culturale Open
Social sciences have long lingered on the legitimacy of visual search techniques about the production of knowledge. This happens in an academic context where writing has historically a clear supremacy as medium for communication and dissem…
View article: A large-area double rotating-crystal monochromator for time-focusing neutron instruments
A large-area double rotating-crystal monochromator for time-focusing neutron instruments Open
We present the principle and the first prototypes of a double rotating-crystal monochromator, based on an assembly of smaller rotating elements. Such a device was developed as the key element to implement a parallel-beam modification of th…
View article: The New Sorgentina Fusion Source-NSFS: 14 MeV neutrons for fusion and beyond
The New Sorgentina Fusion Source-NSFS: 14 MeV neutrons for fusion and beyond Open
Abstract. The present paper is neither dogmatic, nor authoritative. In my view, palaeontology is a humanistic discipline which – apart from describing the hard skeleton (the palaeontologic species) and beyond it – attempts to suggest the t…
View article: Collective Ion Dynamics in Liquid Zinc: Evidence for Complex Dynamics in a Non-Free-Electron Liquid Metal
Collective Ion Dynamics in Liquid Zinc: Evidence for Complex Dynamics in a Non-Free-Electron Liquid Metal Open
A detailed inelastic neutron scattering investigation of the THz dynamics of liquid zinc is presented. The observed Q dependence clearly reveals the existence of a complex dynamics made up of two distinct excitations. The highest energy mo…
View article: Progress towards Bell-type polarization experiment with thermal neutrons
Progress towards Bell-type polarization experiment with thermal neutrons Open
Experimental tests of Bell-type inequalities distinguishing between quantum\nmechanics and local realistic theories remain of considerable interest if\nperformed on massive particles, for which no conclusive result has yet been\nobtained. …