Low-energy Li11+p and Li11+d scattering in a multicluster model

P. Descouvemont
Phys. Rev. C 101, 064611 – Published 15 June 2020

Abstract

The Li11+p and Li11+d reactions are investigated in the continuum discretized coupled channel (CDCC) method with a three-body description (Li9+n+n) of Li11. I first discuss the properties of Li11, and focus on E1 transition probabilities to the continuum. The existence of a 1 resonance at low excitation energies is confirmed, but the associated E1 transition from the ground state does not have an isoscalar character, as suggested in a recent experiment. In a second step, I study the Li11+p elastic cross section at Elab=66 MeV in the CDCC framework. I obtain a fair agreement with experiment, and show that breakup effects are maximal at large angles. The breakup cross section is shown to be dominated by the 1 dipole state in Li11, but the role of this resonance is minor in elastic scattering. From CDCC equivalent Li11+p and Li11+n potentials, I explore the Li11+d cross section within a standard three-body Li11+(p+n) model. At small angles, the experimental cross section is close to the Rutherford scattering cross section, which is not supported by the CDCC. A five-body (Li9+n+n)+(p+n) calculation is then performed. Including breakup states in Li11 and in the deuteron represents a numerical challenge for theory, owing to the large number of channels. Although a full convergence could not be reached, the CDCC model tends to overestimate the data at small angles. I suggest that measurements of the Li9+p elastic scattering would be helpful to determine more accurate optical potentials. The current disagreement between experiment and theory on Li11+d scattering also deserves new experiments at other energies.

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  • Received 16 March 2020
  • Accepted 1 June 2020

DOI:https://doi.org/10.1103/PhysRevC.101.064611

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

P. Descouvemont*

  • Physique Nucléaire Théorique et Physique Mathématique, C.P. 229, Université Libre de Bruxelles (ULB), B 1050 Brussels, Belgium

  • *pdesc@ulb.ac.be

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Vol. 101, Iss. 6 — June 2020

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