Scattering of polarized 7Li from 4He

K. Rusek, P. D. Cathers, E. E. Bartosz, N. Keeley, K. W. Kemper, and F. Maréchal
Phys. Rev. C 67, 014608 – Published 31 January 2003
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Abstract

Complete sets of analyzing powers for elastic and inelastic (to the 1/2 first excited and 7/2 resonant states of 7Li) scattering of polarized 7Li by 4He have been obtained. Relations between the different analyzing powers were determined by applying the invariant amplitude method. A comparison of these relations with the measured analyzing powers suggests that the odd rank tensor analyzing powers arise from higher order quadrupole interactions. The quadrupole interaction also gives rise to the inelastic analyzing powers. Continuum-discretized coupled-channels calculations using α+t cluster-folded potentials confirm this crucial role of the quadrupole interaction in producing the observed 7Li+4He analyzing powers. Cluster-folded spin-orbit and third rank tensor potentials were found to have negligible effects, in contrast to polarized deuteron elastic scattering where the spin-orbit potential plays the dominant role, even in producing the second rank analyzing powers. Coupling between the excited states of 7Li, in particular that between the 0.478 MeV 1/2 and the 6.68 MeV 5/2 states, was also found to be important.

  • Received 7 October 2002

DOI:https://doi.org/10.1103/PhysRevC.67.014608

©2003 American Physical Society

Authors & Affiliations

K. Rusek*

  • Department of Nuclear Reactions, The Andrzej Sołtan Institute for Nuclear Studies, Hoża 69, 00-681 Warsaw, Poland

P. D. Cathers, E. E. Bartosz, N. Keeley, K. W. Kemper, and F. Maréchal§

  • Department of Physics, The Florida State University, Tallahassee, Florida 32306-4350

  • *Electronic address: rusek@fuw.edu.pl
  • Present address: University of Belize, Belize City, Belize.
  • Present address: CyTerra Corporation, Orlando, Florida.
  • §Present address: Institut de Recherches Subatomiques, BP28, F-67037 Strasbourg, Cedex 2, France.

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Vol. 67, Iss. 1 — January 2003

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