Coupled-Channel Evaluations of Cross Sections for Scattering Involving Particle-Unstable Resonances

P. Fraser, K. Amos, L. Canton, G. Pisent, S. Karataglidis, J. P. Svenne, and D. van der Knijff

Phys. Rev. Lett. 101, 242501 – Published 12 December 2008

Abstract

How does the scattering cross section change when the colliding bound-state fragments are allowed particle-emitting resonances? This question is explored in the framework of a multichannel algebraic scattering method of determining nucleon-nucleus cross sections at low energies. Two cases are examined, the first being a gedanken investigation in which $n + {}^{12}C$ scattering is studied with the target states assigned artificial widths. The second is a study of neutron scattering from ${}^{8}{Be}$ , a nucleus that is particle unstable. Resonance character of the target states markedly varies evaluated cross sections from those obtained assuming stability in the target spectrum.

Received 27 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.242501

Authors & Affiliations

P. Fraser^1,*, K. Amos¹, L. Canton², G. Pisent², S. Karataglidis³, J. P. Svenne⁴, and D. van der Knijff⁵

¹School of Physics, University of Melbourne, Victoria 3010, Australia
²Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131, Italy
³Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa
⁴Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
⁵Advanced Research Computing, Information Division, University of Melbourne, Victoria 3010, Australia

^*pfraser@ph.unimelb.edu.au

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Vol. 101, Iss. 24 — 12 December 2008

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