Papers by gianfranco prete
Excitation energy deposition in 209Bi(alpha,alpha') reactions at 240 MeV
Physical Review C, 1998
Fission dynamics with the 4π detector 8πLP
Physics of Atomic Nuclei, 2003
A 4π light charged particle spectrometer, named 8πLP, is in operation at the Laboratori Nazionali... more A 4π light charged particle spectrometer, named 8πLP, is in operation at the Laboratori Nazionali di Legnaro (Italy) for the study of the reaction mechanisms produced in low-energy heavy-ion reactions. The spectrometer has recently been used in a study of fission dynamics that involves the detection of light charged particles in the fission and evaporation residue channel in a system
Alpha particle emission, incomplete fusion and population of high-spin states in the reaction 120 MeV
Nuclear Physics A, 1999
The reaction 120 MeV 19F+ 181Ta has been studied by charged particle-γ-ray coincidence techniques... more The reaction 120 MeV 19F+ 181Ta has been studied by charged particle-γ-ray coincidence techniques. An incomplete fusion component has been identified in coincidence with 192,191 Hg residues which are populated in the αxn channels. Evidence has been found ...
High spin selection in compound nucleus decay by detecting multiple alpha chains
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992
... Fornal ', F. Gramegna and G. Prete Istituto Nazionale di Fisica Nucleare, Laborator Nazi... more ... Fornal ', F. Gramegna and G. Prete Istituto Nazionale di Fisica Nucleare, Laborator Nazionali di Legnaro, 135020 Legnaro (Padova), Italy R. Burch, D. Fabrls ... the hodoscope in the center of mass frame was evaluated to be AD 1 zr by using the Monte Carlo simulations described ...
A logarithmic detection system for nuclear physics
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992
The operating principles of a single output logarithmic detector suitable for heavy ions nuclear ... more The operating principles of a single output logarithmic detector suitable for heavy ions nuclear studies is described. The basic module consists of a three stage DeltaE-E telescope: a gas section, a solid-state detector and a scintillator (CsI(Tl)). Preliminary results on the possibility to collect on the silicon detector the ionization charge produced in the gas section are presented. A proper
Physical observables of isospin equilibrium
Data have been taken by the NIMROD collaboration at the Texas A University Cyclotron Institute fo... more Data have been taken by the NIMROD collaboration at the Texas A University Cyclotron Institute for the systems of 35 and 45 MeV per nucleon 54, 58Fe on 58, 64Ni in order to study isospin equilibration. Physical observables will be discussed from the current study. These observables include isotope and isobar ratios and the (N/Z) tracer term. Trends in the
SPES [1] is a second-generation ISOL RIB facility [2] of the National Institute of Nuclear Physic... more SPES [1] is a second-generation ISOL RIB facility [2] of the National Institute of Nuclear Physics (INFN laboratory, Legnaro, Italy) actually in construction phase. The main goal is to provide intense neutron-rich Radioactive Ion Beams directly impinging a UCx target with a proton beam of 40 MeV and current up to 0.2 mA. The production target follows an innovative approach which consists in a target configuration able to keep high the number of fissions, up to 1013 per second, low power deposition and fast release of the produced isotopes. The exotic isotopes generated in the target are then ionized, mass separated and re-accelerated by the ALPI [3] superconducting LINAC at energies of 10 AMeV and higher, for masses in the region of A=130 amu, with an expected rate on the secondary target up to 10^9 particles per second In this work, we will present the recent results on the R&D activities regarding the SPES RIB production complex (see Fig.1).
Nuovo Cimento C Geophysics Space Physics C, Sep 1, 2019
SPES (Selective Production of Exotic Species) is the INFN project for a Nuclear Physics facility ... more SPES (Selective Production of Exotic Species) is the INFN project for a Nuclear Physics facility for the production of Radioactive Ion Beams (RIBs). It is in advanced construction in Legnaro, with several technological innovations and challenges foreseen, comprehensive of new achievements and improvements. SPES will provide mostly neutron-rich exotic beams, derived by the fission fragments (up to 10 13 fiss/s) produced in the interaction of an intense proton beam (200 µA) on a direct UCx target. Several other targets will be developed, in order to provide users a large beam selection. The expected SPES beam intensities, their quality and, finally, their maximum energies (up to 11 MeV/n for A=130) will permit to perform forefront research in nuclear structure and nuclear dynamics, studying a region of the nuclear chart far from stability. This goal will be reached by coordinating the developments on the accelerator complex and those of up-to-date experimental setups .
iThemba LABS is a multidisciplinary research facility that provides accelerator-based facilities ... more iThemba LABS is a multidisciplinary research facility that provides accelerator-based facilities for physical, biomedical and material sciences, treatment of cancer patients with neutrons and protons and the production of radioisotopes and radiopharmaceuticals. The demand for beam time by the 3 main users, namely radioisotope production, nuclear physics research and medical applications, exceeds the available time by far. During the past 3 years a feasibility study for a new radioactive ion beam and radioisotope production facility at iThemba LABS has been in progress. A dedicated isotope production facility is proposed which will free up the existing K=200 separated-sector cyclotron facility for nuclear physics research with stable beams. A facility for the production of low-energy radioactive ion beams is planned using the K=200 cyclotron as driver for the production of radioactive beams. A technical overview of the proposed isotope production and radioactive-ion beam facility wil...
Status of the High Intensity Proton Beam Facility at LNL
In 2013 the SPES (Selective Production of Exotic Species) project has entered in the construction... more In 2013 the SPES (Selective Production of Exotic Species) project has entered in the construction phase at Laboratori Nazionali di Legnaro (LNL). The project, whose main goal is the research in nuclear physics with Radioactive Beams, has foreseen the construction of a new building hosting the accelerator able to deliver protons up the energy of 70 MeV and 50kW of beam power to be used as a primary beam for the ISOL source and for a production beam for other applications. The new facility design has been expanded and upgraded for taking advantage of the dual simultaneous extraction of beams from the Cyclotron in order to provide a multipurpose high intensity irradiation facility. Today the new facility is partially installed and the Cyclotron supplied by BEST Theratronics company (CANADA) with the related beam transport lines are under commissioning. The status of the commissioning of the high power accelerator and the capabilities of the facility as multipurpose high intensity proton beam laboratory will be presented.
EPJ Web of Conferences, 2020
In this contribution, we present the CoolGAL fast neutron production target system, to be used in... more In this contribution, we present the CoolGAL fast neutron production target system, to be used in the initial phase of the NEPIR irradiation beamline at the SPES facility, that will be operational in 2022. Initially, NEPIR will be used for shielding studies against fast neutrons for space applications and to investigate neutron-induced single event effects in microelectronic devices and systems. In CoolGAL, the neutron production component, a thick Be cylinder, is immersed in a static bath of Galinstan, a liquid alloy of Ga, In and Sn, contained by an outer water cooled copper cladding. MCNPX calculations indicate that, by using a 1 μA current of 70 MeV protons, it can produce a fast neutron energy spectrum that is somewhat flat the 30-65 MeV energy range and with a sharp cut-off at the beam energy. At the standard test point, located 2.6 m downstream from the source, the beam spot diameter, defined by the peculiar collimation scheme of the initial phase of NEPIR, is 10 cm and the i...
Journal of Physics: Conference Series, 2018
SPES (Selective Production of Exotic Species) is an ISOL type facility for production and post-ac... more SPES (Selective Production of Exotic Species) is an ISOL type facility for production and post-acceleration of exotic nuclei for forefront research in nuclear physics. Radioactive (RA) species (A=80÷160) will be produced by fissions induced by a proton beam impinging on an UCx target: the proton beam will be delivered by a commercial cyclotron with a 40 MeV maximum energy and a 0.25 mA maximum current. The RA species, extracted from the Target-Ion-Source system as a 1+ beam , will be cooled in a RFQ (radiofrequency quadrupole) beam cooler (RFQ-BC) and purified from the isobars contaminants through a High Resolution Mass Separator (HRMS). Post-acceleration will be performed via an ECR-based charge breeder, delivering the obtained q+ RA beam to a being built CW RFQ and to the being upgraded superconducting (sc) linac ALPI (up to 10 MeV/A for a mass-to-charge ratio A/q=7).
Journal of Physics: Conference Series, 2017
The Selective Production of Exotic Species (SPES) project is presently under development at INFN-... more The Selective Production of Exotic Species (SPES) project is presently under development at INFN-LNL: aim of this project is the production, ionization and postacceleration of radioactive ions to perform forefront research in nuclear physics. An ECR-based charge breeder (SPES-CB) will allow post-acceleration of radioactive ions: in particular, the SPES-CB has been designed and developed by LPSC of Grenoble, based on the Phoenix booster. It will be equipped with a complete test bench totally integrated with the SPES beam line: this part of the post-accelerator, together with the newly designed RFQ, composes the socalled ADIGE injector (Acceleratore Di Ioni a Grande carica Esotici) for the superconducting linac ALPI. The injector will employ a unique Medium Resolution Mass Spectrometer (MRMS, resolving power 1/1000), mounted downstream the SPES-CB, in order to avoid the typical drawback of the ECR-based charge breeding technique, that is the beam contamination. This contribution describes the ADIGE injector, with particular attention to the analysis of possible contaminations and the performances expected for the MRMS, showing the beam dynamics calculations for a reference radioactive beam.
Physical Review C, 2016
The forward-emitted low energy tail of the neutron spectrum generated by the 7 Li(p,n) 7 Be react... more The forward-emitted low energy tail of the neutron spectrum generated by the 7 Li(p,n) 7 Be reaction on a thick target at a proton energy of 1893.6 keV was measured by time-of-flight spectroscopy. The measurement was performed at BELINA (Beam Line for Nuclear Astrophysics) of the Laboratori Nazionali di Legnaro. Using the reaction kinematics and the proton on lithium stopping power the shape of the excitation function is calculated from the measured neutron spectrum. Good agreement with two reported measurements was found. Our data, along with the previous measurements, are well reproduced by the Breit-Wigner single-resonance formula for s-wave particles. The differential yield of the reaction is calculated and the widely used neutron spectrum at a proton energy of 1912 keV was reproduced. Possible causes regarding part of the 6.5% discrepancy between the 197 Au(n,γ) cross section measured at this energy by Ratynski and Kappeler [Phys. Rev. C 37, 595 (1988)] and the one obtained using the Evaluated Nuclear Data File version B-VII.1 are given.
The European Physical Journal Plus, 2016
Advances in science and technology in the field of neutron science have been heightened by a frui... more Advances in science and technology in the field of neutron science have been heightened by a fruitful combination of major international facilities supported by networks of smaller regional facilities. Recent progress in accelerator technology and neutronic design have made it possible to construct small-scale accelerator-driven neutron facilities that could play a significant role in neutron technology and science. The neutron applications using compact acceleratordriven neutron sources are now becoming more and more important since they can contribute to various fields such as material science, engineering, nuclear physics, cancer therapy, soft error and so on; therefore, they could play a more significant role in the future. To promote such activities, in 2010, the Union for Compact Accelerator-driven Neutron Sources (UCANS) was established. Following fruitful meetings held in Beijing (China), Bloomington (US), Bilbao (Spain), Hokkaido University (Japan) and Padova (Italy) (please visit http://www.indiana.edu/~lens/UCANS/), the Union realized its expanding role in education and training of users for the large neutron sources as well as in R&D of neutron applications beyond materials characterization. The reasons for the increasing activities are manifold. Firstly, as high-power (∼ 0.5-2 MW) neutron-scattering facilities become available to users through competitive proposal systems, an increasing number of beginners and research students could seek training or practice of scattering experiments at small sources. Secondly, small sources are ideal test beds for R&D and validation of advanced instrumentation and techniques, leading to eventual utilization at existing and future big facilities. Thirdly, there are other disciplines, such as nuclear astrophysics, neutron capture therapy, isotope production, etc., whose advancement depends on experimentation at small-to-medium energy neutron sources. Therefore, the growth of the scientific and engineering communities that associate with utilization of neutrons will rely, to a large extent, on the dynamic balancing of availability and capability between large and small neutron sources. The six papers focusing on CANS selected for EPJ Plus aim to promote awareness of the progress and various functionalities of CANS against a backdrop of international landscape of neutron facilities. In Europe, a major change in the neutron arena over the next 10 years is expected, given several reactor sources will close, leading to a substantial reduction in the capacity that is inadequate to fulfill scientific demands of the user community. The advent of the ESS operation, with 16 neutron beamlines by 2025, will merely replenish the capacity lost by the closure of one reactor, e.g., the BERII in Berlin. Given the highly unlikely scenario that any European country will consider building a new research reactor, accelerator-driven sources have to step up to maintain scientific productivity in order to avoid a collapse of the system. In Asia and in the Americas, increasing number of neutron users have realized the synergetic roles of compact accelerator sources in neutronics and instrumentation development, education, and ancillary research accompanying the operation of large, national spallation sources. This set of papers show, on the one hand, that the success of CANS in advancing the field of neutron scattering in spite of their original spin-off from legacy accelerator projects and, on the other hand, that new, optimized high-brilliant or special-purpose CANS are needed for sustaining neutron research thrusts in the future, not only for materials research but also for other disciplines and applications. The focus of these papers also calls attention to the burgeoning opportunity of international collaboration between the networks of high-power sources (i.e., ICANS) and compact sources (i.e., UCANS) within the multidisciplinary accelerator-base neutron source communities.
International Journal of Modern Physics: Conference Series, 2016
A fast neutron (E> MeV) irradiation facility is under development at the 70 MeV SPES proton cy... more A fast neutron (E> MeV) irradiation facility is under development at the 70 MeV SPES proton cyclotron at LNL (Legnaro, Italy) to investigate neutron-induced Single Event Effects (SEE) in microelectronic devices and systems. After an overview on neutron-induced SEE in electronics, we report on the progress in the design of ANEM (Atmospheric Neutron EMulator), a water-cooled rotating target made of Be and W to produce neutrons with an energy spectrum similar to that of neutrons produced by cosmic rays at sea-level. In ANEM, the protons from the cyclotron alternatively impinge on two circular sectors of Be and W of different areas; the effective neutron spectrum is a weighted combination of the spectra from the two sectors. In this contribution, we present the results of thermal-mechanical Finite Element Analysis (ANSYS) calculations of the performance of the ANEM prototype. The calculations at this stage indicate that ANEM can deliver fast neutrons with an atmospheric-like energy s...
EPJ Web of Conferences, 2010
The systems of intermediate fissility 132 Ce and 158 Er have been studied experimentally and theo... more The systems of intermediate fissility 132 Ce and 158 Er have been studied experimentally and theoretically in order to investigate the dissipation properties of nuclear matter. Cross sections of fusion-fission and evaporation residues channels together with charged particles multiplicities in both channels, their spectra, angular correlations and mass-energy distribution of fission fragments have been measured. Theoretical analysis has been performed using multi-dimensional stochastic approach with realistic treatment of particle evaporation. The results of analysis show that full one-body or unusually strong two-body dissipation allows to reproduce experimental data. No temperature dependent dissipation was needed.
EPJ Web of Conferences, 2013
This contribution presents a journey within the open questions about the current use of a tempera... more This contribution presents a journey within the open questions about the current use of a temperature dependent nuclear viscosity in models of nuclear fission and proposes an alternative experimental approach by using systems of intermediate fissility. This study is particularly relevant because: i) systems of intermediate fissility offer a suitable framework since the intervals between the compound nucleus and scission point temperatures with increasing excitation energy are much smaller than in the case of heavier systems, ii) the measurement of observables in the ER channel translates into a larger set of effective constraints for the models.
The control system of the Target Carburization prototype for the SPES project
Progress on the Direct SPES Target Concept
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Papers by gianfranco prete