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Movement of Efimov states in C20 causing resonance in nC19 scattering near scattering threshold

V. Arora, I. Mazumdar, and V. S. Bhasin
Phys. Rev. C 69, 061301(R) – Published 8 June 2004

Abstract

Movement of Efimov states in C20 as a result of increasing the nC18 binding energy from about 100to500keV is studied in a three body model for C20, assumed to be n+n+C18 system, employing separable potentials for the nn and nC18 binary subsystems. The computational analysis shows that for small values of energies (< about 120keV) which are just necessary to bind the two body (nC18) system, there could be more than one bound Efimov states. But the states are found to go on disappearing one by one as the binding energy is increased beyond 200keV. As originally pointed out by Amado and Noble [Phys. Rev. D 5, 1992 (1972)], the Efimov states move into the unphysical sheet associated with the two body unitarity cut on increasing the strength of the binary interaction to bind the two body system. By undertaking a detailed study of the scattering of neutron on a bound (nC18) system, we find that these states move over to the physical scattering region causing a resonance in nC19 scattering around neutron incident energy of 1.6keV, having a width of about 0.25keV.

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  • Received 30 January 2004

DOI:https://doi.org/10.1103/PhysRevC.69.061301

©2004 American Physical Society

Authors & Affiliations

V. Arora

  • Department of Physics and Astrophysics, University of Delhi, Delhi 1100 07, India

I. Mazumdar

  • Tata Institute of Fundamental Research, Mumbai 400 005, India

V. S. Bhasin

  • Department of Physics and Astrophysics, University of Delhi, Delhi 1100 07, India

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Issue

Vol. 69, Iss. 6 — June 2004

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