Extension of the quantum formalism for direct multistep reactions

• Grant number: 16/07398-8
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): July 01, 2016
• Effective date (End): February 28, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics - Nuclear Physics
• Principal researcher: Brett Vern Carlson
• Grantee: Emanuel Vicente Chimanski
• Home Institution: Divisão de Ciências Fundamentais (IEF). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil
• Associated scholarship(s): 17/13693-5 - Comparison of preequilibrium nuclear reaction calculations in multistep direct reaction models, BE.EP.DR

Abstract

Pre-equilibrium nuclear reactions occur on a time scale intermediate between the fast direct reactions and the slow evaporation from the compound nucleus. With increasing projectile energy, the pre-equilibrium reaction component becomes more and more visible in the reaction spectra and angular distributions, being of special importance in applications using energetic beams of nucleons such as in proton radiotherapy or accelerator-driven-systems (ADS). Although these reactions have been studied for over 50 years, due to their complexity, it has not yet been possible to obtain a fundamental description of them. The only quantum models of these reactions were proposed 30 years ago and are limited to processes in which at most one particle is emitted. They also make use of statistical hypotheses and approximations that are, at best, difficult to justify. Our objectives concentrate on an analysis of the first two steps of a pre-equilibrium reaction and on the extension of the quantum formalism to include up to two particles in the continuum afte the first interaction and up to three after the second interaction, the maximum number of continuum particles physically permitted. We also intend to study in detail the coherence / incoherence between pairs of excitations that lead to the same state after the second collision.

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CHERTOVSKIH, R.; REMPEL, E. L.; CHIMANSKI, E. V.. Magnetic field generation by intermittent convection. Physics Letters A, v. 381, n. 38, p. 3300-3306, OCT 10 2017. (16/07398-8, 13/26258-4, 13/01242-8)

SOUZA, L. A.; CHIMANSKI, V, E.; CARLSON, V, B.. Inclusive breakup cross sections in reactions induced by the nuclides He-6 and Li-6,Li- 7 in the two-body cluster model. Physical Review C, v. 104, n. 3, SEP 24 2021. (16/07398-8, 19/07767-1, 17/13693-5)

CHIMANSKI, V, E.; CARLSON, V, B.. Nucleon-induced inelastic scattering with statistical strength functions and the ECIS direct reaction code. EUROPEAN PHYSICAL JOURNAL A, v. 57, n. 6, JUN 2021. (17/13693-5, 16/07398-8, 17/05660-0)

CHIMANSKI, V, E.; CARLSON, V, B.; CAPOTE, R.; KONING, A. J.. Quasiparticle nature of excited states in random-phase approximation. Physical Review C, v. 99, n. 1, JAN 8 2019. (16/07398-8, 17/13693-5, 17/05660-0)

CHIMANSKI, E. V.; SOUZA, L. A.; CARLSON, B. V.. The Sao Paulo Potential and the 3He Breakup Reaction at 130 MeV on 93Nb and 197Au. Brazilian Journal of Physics, v. 51, n. 2, SI, p. 323-327, APR 2021. (17/13693-5, 19/07767-1, 16/07398-8, 17/05660-0)