Determination of the cosmic-ray-induced neutron flux and ambient dose equivalent at flight altitude

Journal of Physics: Conference Series, Volumen 630There is interest in modeling the atmosphere in the South Atlantic Magnetic Anomaly in order to obtain information about the cosmic-ray induced neutron spectrum and angular distribution as functions of altitude. In this work we use the Monte Carlo codes MCNPX and Geant4 to determine the cosmic-ray-induced neutron flux in the atmosphere produced by the cosmic ray protons incident on the top of the atmosphere and to estimate the ambient dose equivalent rate as function of altitude. The results present a reasonable conformity to other codes (QARM and EXPACS) based on other parameterizations

Global and consistent analysis of the heavy-ion elastic scattering and fusion processes

We have developed a model for the nuclear interaction which is based on the effects of the Pauli nonlocality. In earlier works, we have successfully used this interaction to describe the elastic scattering for several systems in a very wide energy range. In the present work, we have checked the validity of the same interaction in the description of about 2500 fusion cross section data for 165 different systems. By introducing only one energyand system-independent effective parameter, the nonlocal model describes the global behavior of the fusion process with good precision

Precise nuclear matter densities from heavy-ion collisions

An unfolding method is proposed to extract ground-state nuclear matter densities from heavy-ion elastic scattering data analyses at low (sub-barrier) and intermediate energies. The consistency of the results is fully checked. The method should be of value in determining densities for exotic nuclei

Elastic, inelastic, and 1 n transfer cross sections for the 10 B + 120 Sn reaction

The 10 B + 120 Sn reaction has been investigated at E Lab = 37.5 MeV. The cross sections for different channels, such as the elastic scattering, the excitation of the 2 + and 3 − 120 Sn states, the excitation of the 1 + state of 10 B , and the 1 n pick-up transfer, have been measured. One-step distorted-wave Born approximation and coupled-reaction-channels calculations have been performed in the context of the double-folding São Paulo potential. The effect of coupling the inelastic and transfer states on the angular distributions is discussed in the paper. In general, the theoretical calculations within the coupled-reaction-channels formalism yield a satisfactory agreement with the corresponding experimental angular distributions.Instituto Nacional de Ciência e Tecnologia-Física Nuclear e Aplicações de Brasil (INCT-FNA) 464898/2014-

Understanding the mechanisms of nuclear collisions: A complete study of the 10 B + 120 Sn reaction

Background: Reactions involving exotic and stable weakly bound nuclei have been extensively studied in recent years. Although several models have been successfully used to explain particular reaction outcomes, the answers to many questions remain elusive. In previous works, we presented elastic, inelastic, and transfer angular distributions for the 10B + 120Sn system measured at ELab = 31.5, 33.0, 35.0, and 37.5 MeV. The data set was analyzed through coupled reaction channels calculations in the context of the double-folding São Paulo potential. Purpose: We investigate nuclear reaction mechanisms for systems involving weakly bound projectiles. Method: Angular distributions for several nuclear reaction processes were measured for the 10B + 120Sn system at ELab = 39.70 MeV. Results: The new data set involves angular distributions for elastic scattering, projectile and target inelastic excitations, one-neutron pickup transfer, one-proton stripping transfer, deuteron pickup transfer, and 3,4 He stripping transfer. We have also observed 10Be nuclei. The effect of the couplings to some nonelastic states on the angular distributions is discussed. Conclusion: The theoretical calculations within the coupled reaction channels formalism provide an overall good agreement with the corresponding inelastic, one-neutron stripping, one-proton pickup, one-deuteron pickup, and 3 He stripping transfer data. However, to improve the description of the elastic scattering angular distribution, the inclusion of additional channels in the coupling scheme might be necessary.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) 2018/09998-8, 2019/07767-1, 2019/05769-7 y 2017/05660-0;Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 304056/2019-7, 302160/2018-3 y 306433/2017- 6Instituto Nacional de Ciência e Tecnologia-Física Nuclear e Aplicações (INCT-FNA) 464898/2014-5Ministerio de Ciencia, Innovación y Universidades de España. PGC2018-096994-B-C21Ministerio de Economía de España y Competitividad y fondos FEDER. FIS2017-88410-

Determination of the 12C nuclear density through heavy-ion elastic scattering experiments

Precise elastic scattering differential cross sections have been measured for the 12C158Ni,208Pb systems at sub-barrier energies. The corresponding bare potentials have been determined at interaction distances larger than the respective barrier radii, and the results have been compared with those from an early extensive systematics for the nuclear potential. The present data have been combined with others for the 12C 112C,208Pb systems at intermediate energies, in order to extract the 12C ground-state nuclear density through an unfolding method

Experimental determination of the surface density for the 6He exotic nucleus

Angular distributions for the elastic scattering of 4,6He on 58Ni have been measured at near-barrier energies. The present data, combined with others for the 4He158Ni system at intermediate energies, allowed the determination of the 4,6He ground-state nuclear densities through an unfolding method. The experimentally extracted nuclear densities are compared with the results of theoretical calculations

IAEA coordinated research project on nuclear data for charged-particle monitor reactions and medical isotope production

An IAEA coordinated research project was launched in December 2012 to establish and improve the nuclear data required to characterise charged-particle monitor reactions and extend data for medical radionuclide production. An international team was assembled to undertake work addressing the requirements for more accurate cross-section data over a wide range of targets and projectiles, undertaken in conjunction with a limited number of measurements and more extensive evaluations of the decay data of specific radionuclides. These studies are nearing completion, and are briefly described below.Work at ANL is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC02-06CH11357