Bogoliubov Laboratory of Theoretical Physics

Seminar on Nuclear Theory

Date and Time: Monday, 26 June 2023, at 3:30 PM

Venue: Blokhintsev lecture hall, Bogoliubov Laboratory of Theoretical Physics, online on Zoom

Information about seminar and link to join

Seminar topic: “Fusion reactions in collisions of neutron halo nuclei with heavy targets”

Authors: J. Lubian¹, J. L. Ferreira², J. Rangel², L. F. Canto<sup>3

1</sup> – Instituto de Fisica, Universidade Federal Fluminense, Niteroi, Brazil
² – Departamento de Matematica, Fisica e computacao Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia, Resende, Brazil
³ – Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

Speaker: Jesus Lubian

Abstract:

We investigate fusion reactions in collisions of neutron-halo projectiles with heavy targets. For this purpose, we use a recently developed theoretical approach to calculate cross sections for fusion processes in ¹¹Be + ²⁰⁹Bi, ⁶He + ²⁰⁹Bi, and ⁶He + ²³⁸U collisions and compare the results with the available data. The overall agreement between theory and experiment is good. Comparing the cross sections with predictions of a barrier penetration model that ignores the cluster structure of the projectile, we conclude that the fusion cross sections are suppressed above the Coulomb barrier and enhanced below. Further, we find that the deviations from predictions of the barrier penetration model depend exclusively on the breakup threshold of the projectile, increasing as it decreases.