title: Calculation of multichannel reactions in the four-nucleon system above breakup threshold.
abstract: The exact four-body equations of Alt, Grassberger, and Sandhas are solved for neutron-3He and proton-3H scattering in the energy regime above the four-nucleon breakup threshold. Cross sections and spin observables for elastic, transfer, charge-exchange, and breakup reactions are calculated using realistic nucleon-nucleon interaction models, including the one with effective many-nucleon forces due to explicit Δ-isobar excitation. The experimental data are described reasonably well with only few exceptions such as vector analyzing powers.
authors.affiliation: Centro de Física Nuclear, Universidade de Lisboa, P-1649-003 Lisboa, Portugal and Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12, LT-01108 Vilnius, Lithuania.
authors.forename: A
authors.initials: A
authors.lastname: Deltuva
authors.affiliation: Centro de Física Nuclear, Universidade de Lisboa, P-1649-003 Lisboa, Portugal.
authors.forename: A C
authors.initials: AC
authors.lastname: Fonseca