Simultaneous analysis of elastic scattering and fusion in He6+Zn64: A transition in direct reaction mechanisms, striking threshold anomalies, and halo effects

E. F. Aguilera, F. Torabi, and J. C. Morales-Rivera
Phys. Rev. C 104, 054612 – Published 29 November 2021

Abstract

Using the extended optical model, a simultaneous analysis is carried out of elastic scattering and fusion reactions induced by the neutron halo He6 projectile on a Zn64 target. Dynamic polarization potentials UF, UD are introduced which can be associated to fusion and direct couplings, respectively. Appropriate fitting parameters leading to dispersive potentials are found which provide a good simultaneous description of the data. An unexpected local maximum is uncovered in the energy dependence of the total reaction cross sections, indicating a transition in the involved direct reaction processes, and a possible underlying mechanism is discussed. UF is found to follow the normal threshold anomaly but with an unusually large threshold energy. UD, on the other hand, exhibits a breakup threshold anomaly, but with a strikingly high value of the peak energy, which can be associated to the above-mentioned transition. The results also are discussed within the context of possible halo effects.

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  • Received 2 September 2021
  • Revised 11 October 2021
  • Accepted 15 November 2021

DOI:https://doi.org/10.1103/PhysRevC.104.054612

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

E. F. Aguilera1,*, F. Torabi1, and J. C. Morales-Rivera1,2

  • 1Departamento de Aceleradores y Estudio de Materiales, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, Código Postal 11801, México, Distrito Federal, México
  • 2Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario 100, Código Postal 50000, Toluca, México

  • *eli.aguilera@inin.gob.mx

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Vol. 104, Iss. 5 — November 2021

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